Step | Hyp | Ref
| Expression |
1 | | prproropf1o.f |
. . . 4
β’ πΉ = (π β π β¦ β¨inf(π, π, π
), sup(π, π, π
)β©) |
2 | | infeq1 9468 |
. . . . 5
β’ (π = π β inf(π, π, π
) = inf(π, π, π
)) |
3 | | supeq1 9437 |
. . . . 5
β’ (π = π β sup(π, π, π
) = sup(π, π, π
)) |
4 | 2, 3 | opeq12d 4881 |
. . . 4
β’ (π = π β β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β©) |
5 | | simp3 1139 |
. . . 4
β’ ((π
Or π β§ π β π β§ π β π) β π β π) |
6 | | opex 5464 |
. . . . 5
β’
β¨inf(π, π, π
), sup(π, π, π
)β© β V |
7 | 6 | a1i 11 |
. . . 4
β’ ((π
Or π β§ π β π β§ π β π) β β¨inf(π, π, π
), sup(π, π, π
)β© β V) |
8 | 1, 4, 5, 7 | fvmptd3 7019 |
. . 3
β’ ((π
Or π β§ π β π β§ π β π) β (πΉβπ) = β¨inf(π, π, π
), sup(π, π, π
)β©) |
9 | | infeq1 9468 |
. . . . 5
β’ (π = π β inf(π, π, π
) = inf(π, π, π
)) |
10 | | supeq1 9437 |
. . . . 5
β’ (π = π β sup(π, π, π
) = sup(π, π, π
)) |
11 | 9, 10 | opeq12d 4881 |
. . . 4
β’ (π = π β β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β©) |
12 | | simp2 1138 |
. . . 4
β’ ((π
Or π β§ π β π β§ π β π) β π β π) |
13 | | opex 5464 |
. . . . 5
β’
β¨inf(π, π, π
), sup(π, π, π
)β© β V |
14 | 13 | a1i 11 |
. . . 4
β’ ((π
Or π β§ π β π β§ π β π) β β¨inf(π, π, π
), sup(π, π, π
)β© β V) |
15 | 1, 11, 12, 14 | fvmptd3 7019 |
. . 3
β’ ((π
Or π β§ π β π β§ π β π) β (πΉβπ) = β¨inf(π, π, π
), sup(π, π, π
)β©) |
16 | 8, 15 | eqeq12d 2749 |
. 2
β’ ((π
Or π β§ π β π β§ π β π) β ((πΉβπ) = (πΉβπ) β β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β©)) |
17 | | prproropf1o.p |
. . . . 5
β’ π = {π β π« π β£ (β―βπ) = 2} |
18 | 17 | prpair 46156 |
. . . 4
β’ (π β π β βπ β π βπ β π (π = {π, π} β§ π β π)) |
19 | 17 | prpair 46156 |
. . . . 5
β’ (π β π β βπ β π βπ β π (π = {π, π} β§ π β π)) |
20 | | id 22 |
. . . . . . . . . . . . . . . 16
β’ (π
Or π β π
Or π) |
21 | 20 | infexd 9475 |
. . . . . . . . . . . . . . 15
β’ (π
Or π β inf({π, π}, π, π
) β V) |
22 | 20 | supexd 9445 |
. . . . . . . . . . . . . . 15
β’ (π
Or π β sup({π, π}, π, π
) β V) |
23 | 21, 22 | jca 513 |
. . . . . . . . . . . . . 14
β’ (π
Or π β (inf({π, π}, π, π
) β V β§ sup({π, π}, π, π
) β V)) |
24 | 23 | ad4antr 731 |
. . . . . . . . . . . . 13
β’
(((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β (inf({π, π}, π, π
) β V β§ sup({π, π}, π, π
) β V)) |
25 | | opthg 5477 |
. . . . . . . . . . . . 13
β’
((inf({π, π}, π, π
) β V β§ sup({π, π}, π, π
) β V) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β (inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)))) |
26 | 24, 25 | syl 17 |
. . . . . . . . . . . 12
β’
(((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β (inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)))) |
27 | | solin 5613 |
. . . . . . . . . . . . . . . . . . 19
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β¨ π = π β¨ ππ
π)) |
28 | | infpr 9495 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ ((π
Or π β§ π β π β§ π β π) β inf({π, π}, π, π
) = if(ππ
π, π, π)) |
29 | 28 | 3expb 1121 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((π
Or π β§ (π β π β§ π β π)) β inf({π, π}, π, π
) = if(ππ
π, π, π)) |
30 | | iftrue 4534 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ (ππ
π β if(ππ
π, π, π) = π) |
31 | 29, 30 | sylan9eqr 2795 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β inf({π, π}, π, π
) = π) |
32 | 31 | eqeq2d 2744 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (inf({π, π}, π, π
) = inf({π, π}, π, π
) β inf({π, π}, π, π
) = π)) |
33 | | suppr 9463 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ ((π
Or π β§ π β π β§ π β π) β sup({π, π}, π, π
) = if(ππ
π, π, π)) |
34 | 33 | 3expb 1121 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ ((π
Or π β§ (π β π β§ π β π)) β sup({π, π}, π, π
) = if(ππ
π, π, π)) |
35 | 34 | adantl 483 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β sup({π, π}, π, π
) = if(ππ
π, π, π)) |
36 | | sotric 5616 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β Β¬ (π = π β¨ ππ
π))) |
37 | | ioran 983 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ (Β¬
(π = π β¨ ππ
π) β (Β¬ π = π β§ Β¬ ππ
π)) |
38 | | iffalse 4537 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ (Β¬
ππ
π β if(ππ
π, π, π) = π) |
39 | 37, 38 | simplbiim 506 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ (Β¬
(π = π β¨ ππ
π) β if(ππ
π, π, π) = π) |
40 | 36, 39 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β if(ππ
π, π, π) = π)) |
41 | 40 | impcom 409 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β if(ππ
π, π, π) = π) |
42 | 35, 41 | eqtrd 2773 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β sup({π, π}, π, π
) = π) |
43 | 42 | eqeq2d 2744 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (sup({π, π}, π, π
) = sup({π, π}, π, π
) β sup({π, π}, π, π
) = π)) |
44 | 32, 43 | anbi12d 632 |
. . . . . . . . . . . . . . . . . . . . . . . . 25
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β (inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π))) |
45 | 44 | adantr 482 |
. . . . . . . . . . . . . . . . . . . . . . . 24
β’ (((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β (inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π))) |
46 | | solin 5613 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β¨ π = π β¨ ππ
π)) |
47 | 46 | adantrr 716 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β (ππ
π β¨ π = π β¨ ππ
π)) |
48 | | simpl 484 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β π
Or π) |
49 | | simprll 778 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β π β π) |
50 | | simprlr 779 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β π β π) |
51 | | infpr 9495 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ π β π β§ π β π) β inf({π, π}, π, π
) = if(ππ
π, π, π)) |
52 | 48, 49, 50, 51 | syl3anc 1372 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β inf({π, π}, π, π
) = if(ππ
π, π, π)) |
53 | | iftrue 4534 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
β’ (ππ
π β if(ππ
π, π, π) = π) |
54 | 52, 53 | sylan9eqr 2795 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β inf({π, π}, π, π
) = π) |
55 | 54 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (inf({π, π}, π, π
) = π β π = π)) |
56 | | suppr 9463 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 36
β’ ((π
Or π β§ π β π β§ π β π) β sup({π, π}, π, π
) = if(ππ
π, π, π)) |
57 | 48, 49, 50, 56 | syl3anc 1372 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β sup({π, π}, π, π
) = if(ππ
π, π, π)) |
58 | 57 | adantl 483 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β sup({π, π}, π, π
) = if(ππ
π, π, π)) |
59 | | sotric 5616 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 37
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β Β¬ (π = π β¨ ππ
π))) |
60 | 59 | adantrr 716 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 36
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β (ππ
π β Β¬ (π = π β¨ ππ
π))) |
61 | | ioran 983 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 37
β’ (Β¬
(π = π β¨ ππ
π) β (Β¬ π = π β§ Β¬ ππ
π)) |
62 | | iffalse 4537 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 37
β’ (Β¬
ππ
π β if(ππ
π, π, π) = π) |
63 | 61, 62 | simplbiim 506 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 36
β’ (Β¬
(π = π β¨ ππ
π) β if(ππ
π, π, π) = π) |
64 | 60, 63 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β (ππ
π β if(ππ
π, π, π) = π)) |
65 | 64 | impcom 409 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β if(ππ
π, π, π) = π) |
66 | 58, 65 | eqtrd 2773 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β sup({π, π}, π, π
) = π) |
67 | 66 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (sup({π, π}, π, π
) = π β π = π)) |
68 | 55, 67 | anbi12d 632 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β (π = π β§ π = π))) |
69 | | orc 866 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((π = π β§ π = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))) |
70 | 68, 69 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
71 | 70 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ (ππ
π β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
72 | | eqneqall 2952 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ (π = π β (π β π β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
73 | 72 | adantld 492 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ (π = π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
74 | 73 | adantld 492 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ (π = π β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
75 | 52 | adantl 483 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β inf({π, π}, π, π
) = if(ππ
π, π, π)) |
76 | 75 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (inf({π, π}, π, π
) = π β if(ππ
π, π, π) = π)) |
77 | | iftrue 4534 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
β’ (ππ
π β if(ππ
π, π, π) = π) |
78 | 57, 77 | sylan9eqr 2795 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β sup({π, π}, π, π
) = π) |
79 | 78 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (sup({π, π}, π, π
) = π β π = π)) |
80 | 76, 79 | anbi12d 632 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β (if(ππ
π, π, π) = π β§ π = π))) |
81 | | simpl 484 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 37
β’ (((π β π β§ π β π) β§ π β π) β (π β π β§ π β π)) |
82 | 81 | ancomd 463 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 36
β’ (((π β π β§ π β π) β§ π β π) β (π β π β§ π β π)) |
83 | | sotric 5616 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 36
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β Β¬ (π = π β¨ ππ
π))) |
84 | 82, 83 | sylan2 594 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β (ππ
π β Β¬ (π = π β¨ ππ
π))) |
85 | | ioran 983 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 37
β’ (Β¬
(π = π β¨ ππ
π) β (Β¬ π = π β§ Β¬ ππ
π)) |
86 | | iffalse 4537 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 37
β’ (Β¬
ππ
π β if(ππ
π, π, π) = π) |
87 | 85, 86 | simplbiim 506 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 36
β’ (Β¬
(π = π β¨ ππ
π) β if(ππ
π, π, π) = π) |
88 | 87 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ (Β¬
(π = π β¨ ππ
π) β (if(ππ
π, π, π) = π β π = π)) |
89 | 84, 88 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β (ππ
π β (if(ππ
π, π, π) = π β π = π))) |
90 | 89 | impcom 409 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (if(ππ
π, π, π) = π β π = π)) |
91 | 90 | anbi1d 631 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((if(ππ
π, π, π) = π β§ π = π) β (π = π β§ π = π))) |
92 | | olc 867 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
β’ ((π = π β§ π = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))) |
93 | 92 | ancoms 460 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((π = π β§ π = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))) |
94 | 91, 93 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((if(ππ
π, π, π) = π β§ π = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
95 | 80, 94 | sylbid 239 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
96 | 95 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ (ππ
π β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
97 | 71, 74, 96 | 3jaoi 1428 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((ππ
π β¨ π = π β¨ ππ
π) β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
98 | 47, 97 | mpcom 38 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
99 | 98 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
β’ (π
Or π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
100 | 99 | ad2antrl 727 |
. . . . . . . . . . . . . . . . . . . . . . . . 25
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
101 | 100 | imp 408 |
. . . . . . . . . . . . . . . . . . . . . . . 24
β’ (((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
102 | 45, 101 | sylbid 239 |
. . . . . . . . . . . . . . . . . . . . . . 23
β’ (((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
103 | 102 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . 22
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
104 | 103 | a1d 25 |
. . . . . . . . . . . . . . . . . . . . 21
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))))) |
105 | 104 | ex 414 |
. . . . . . . . . . . . . . . . . . . 20
β’ (ππ
π β ((π
Or π β§ (π β π β§ π β π)) β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))))) |
106 | | eqneqall 2952 |
. . . . . . . . . . . . . . . . . . . . 21
β’ (π = π β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))))) |
107 | 106 | a1d 25 |
. . . . . . . . . . . . . . . . . . . 20
β’ (π = π β ((π
Or π β§ (π β π β§ π β π)) β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))))) |
108 | 29 | adantl 483 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β inf({π, π}, π, π
) = if(ππ
π, π, π)) |
109 | | sotric 5616 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β Β¬ (π = π β¨ ππ
π))) |
110 | 109 | ancom2s 649 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β Β¬ (π = π β¨ ππ
π))) |
111 | | ioran 983 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ (Β¬
(π = π β¨ ππ
π) β (Β¬ π = π β§ Β¬ ππ
π)) |
112 | | iffalse 4537 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ (Β¬
ππ
π β if(ππ
π, π, π) = π) |
113 | 111, 112 | simplbiim 506 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ (Β¬
(π = π β¨ ππ
π) β if(ππ
π, π, π) = π) |
114 | 110, 113 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ ((π
Or π β§ (π β π β§ π β π)) β (ππ
π β if(ππ
π, π, π) = π)) |
115 | 114 | impcom 409 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β if(ππ
π, π, π) = π) |
116 | 108, 115 | eqtrd 2773 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β inf({π, π}, π, π
) = π) |
117 | 116 | eqeq2d 2744 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (inf({π, π}, π, π
) = inf({π, π}, π, π
) β inf({π, π}, π, π
) = π)) |
118 | | iftrue 4534 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ (ππ
π β if(ππ
π, π, π) = π) |
119 | 34, 118 | sylan9eqr 2795 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β sup({π, π}, π, π
) = π) |
120 | 119 | eqeq2d 2744 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (sup({π, π}, π, π
) = sup({π, π}, π, π
) β sup({π, π}, π, π
) = π)) |
121 | 117, 120 | anbi12d 632 |
. . . . . . . . . . . . . . . . . . . . . . . . 25
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β (inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π))) |
122 | 121 | adantr 482 |
. . . . . . . . . . . . . . . . . . . . . . . 24
β’ (((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β (inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π))) |
123 | 54 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (inf({π, π}, π, π
) = π β π = π)) |
124 | 66 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (sup({π, π}, π, π
) = π β π = π)) |
125 | 123, 124 | anbi12d 632 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β (π = π β§ π = π))) |
126 | 125, 92 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
127 | 126 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ (ππ
π β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
128 | | eqneqall 2952 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ (π = π β (π β π β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
129 | 128 | adantld 492 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ (π = π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
130 | 129 | adantld 492 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ (π = π β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
131 | 84, 87 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 35
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β (ππ
π β if(ππ
π, π, π) = π)) |
132 | 131 | impcom 409 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β if(ππ
π, π, π) = π) |
133 | 75, 132 | eqtrd 2773 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β inf({π, π}, π, π
) = π) |
134 | 133 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (inf({π, π}, π, π
) = π β π = π)) |
135 | 78 | eqeq1d 2735 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β (sup({π, π}, π, π
) = π β π = π)) |
136 | 134, 135 | anbi12d 632 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β (π = π β§ π = π))) |
137 | 69 | ancoms 460 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
β’ ((π = π β§ π = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))) |
138 | 136, 137 | syl6bi 253 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
β’ ((ππ
π β§ (π
Or π β§ ((π β π β§ π β π) β§ π β π))) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
139 | 138 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
β’ (ππ
π β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
140 | 127, 130,
139 | 3jaoi 1428 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
β’ ((ππ
π β¨ π = π β¨ ππ
π) β ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
141 | 47, 140 | mpcom 38 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
β’ ((π
Or π β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
142 | 141 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
β’ (π
Or π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
143 | 142 | ad2antrl 727 |
. . . . . . . . . . . . . . . . . . . . . . . . 25
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
144 | 143 | imp 408 |
. . . . . . . . . . . . . . . . . . . . . . . 24
β’ (((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = π β§ sup({π, π}, π, π
) = π) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
145 | 122, 144 | sylbid 239 |
. . . . . . . . . . . . . . . . . . . . . . 23
β’ (((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β§ ((π β π β§ π β π) β§ π β π)) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
146 | 145 | ex 414 |
. . . . . . . . . . . . . . . . . . . . . 22
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
147 | 146 | a1d 25 |
. . . . . . . . . . . . . . . . . . . . 21
β’ ((ππ
π β§ (π
Or π β§ (π β π β§ π β π))) β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))))) |
148 | 147 | ex 414 |
. . . . . . . . . . . . . . . . . . . 20
β’ (ππ
π β ((π
Or π β§ (π β π β§ π β π)) β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))))) |
149 | 105, 107,
148 | 3jaoi 1428 |
. . . . . . . . . . . . . . . . . . 19
β’ ((ππ
π β¨ π = π β¨ ππ
π) β ((π
Or π β§ (π β π β§ π β π)) β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))))) |
150 | 27, 149 | mpcom 38 |
. . . . . . . . . . . . . . . . . 18
β’ ((π
Or π β§ (π β π β§ π β π)) β (π β π β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))))) |
151 | 150 | adantld 492 |
. . . . . . . . . . . . . . . . 17
β’ ((π
Or π β§ (π β π β§ π β π)) β ((π = {π, π} β§ π β π) β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))))) |
152 | 151 | imp 408 |
. . . . . . . . . . . . . . . 16
β’ (((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β (((π β π β§ π β π) β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
153 | 152 | expdimp 454 |
. . . . . . . . . . . . . . 15
β’ ((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β (π β π β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
154 | 153 | adantld 492 |
. . . . . . . . . . . . . 14
β’ ((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β ((π = {π, π} β§ π β π) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π))))) |
155 | 154 | imp 408 |
. . . . . . . . . . . . 13
β’
(((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β ((π = π β§ π = π) β¨ (π = π β§ π = π)))) |
156 | | vex 3479 |
. . . . . . . . . . . . . 14
β’ π β V |
157 | | vex 3479 |
. . . . . . . . . . . . . 14
β’ π β V |
158 | | vex 3479 |
. . . . . . . . . . . . . 14
β’ π β V |
159 | | vex 3479 |
. . . . . . . . . . . . . 14
β’ π β V |
160 | 156, 157,
158, 159 | preq12b 4851 |
. . . . . . . . . . . . 13
β’ ({π, π} = {π, π} β ((π = π β§ π = π) β¨ (π = π β§ π = π))) |
161 | 155, 160 | syl6ibr 252 |
. . . . . . . . . . . 12
β’
(((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β ((inf({π, π}, π, π
) = inf({π, π}, π, π
) β§ sup({π, π}, π, π
) = sup({π, π}, π, π
)) β {π, π} = {π, π})) |
162 | 26, 161 | sylbid 239 |
. . . . . . . . . . 11
β’
(((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π})) |
163 | | infeq1 9468 |
. . . . . . . . . . . . . . . . . . . 20
β’ (π = {π, π} β inf(π, π, π
) = inf({π, π}, π, π
)) |
164 | | supeq1 9437 |
. . . . . . . . . . . . . . . . . . . 20
β’ (π = {π, π} β sup(π, π, π
) = sup({π, π}, π, π
)) |
165 | 163, 164 | opeq12d 4881 |
. . . . . . . . . . . . . . . . . . 19
β’ (π = {π, π} β β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β©) |
166 | | infeq1 9468 |
. . . . . . . . . . . . . . . . . . . 20
β’ (π = {π, π} β inf(π, π, π
) = inf({π, π}, π, π
)) |
167 | | supeq1 9437 |
. . . . . . . . . . . . . . . . . . . 20
β’ (π = {π, π} β sup(π, π, π
) = sup({π, π}, π, π
)) |
168 | 166, 167 | opeq12d 4881 |
. . . . . . . . . . . . . . . . . . 19
β’ (π = {π, π} β β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β©) |
169 | 165, 168 | eqeqan12rd 2748 |
. . . . . . . . . . . . . . . . . 18
β’ ((π = {π, π} β§ π = {π, π}) β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β©)) |
170 | | eqeq12 2750 |
. . . . . . . . . . . . . . . . . . 19
β’ ((π = {π, π} β§ π = {π, π}) β (π = π β {π, π} = {π, π})) |
171 | 170 | ancoms 460 |
. . . . . . . . . . . . . . . . . 18
β’ ((π = {π, π} β§ π = {π, π}) β (π = π β {π, π} = {π, π})) |
172 | 169, 171 | imbi12d 345 |
. . . . . . . . . . . . . . . . 17
β’ ((π = {π, π} β§ π = {π, π}) β ((β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π}))) |
173 | 172 | ex 414 |
. . . . . . . . . . . . . . . 16
β’ (π = {π, π} β (π = {π, π} β ((β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π})))) |
174 | 173 | ad2antrl 727 |
. . . . . . . . . . . . . . 15
β’ (((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β (π = {π, π} β ((β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π})))) |
175 | 174 | adantr 482 |
. . . . . . . . . . . . . 14
β’ ((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β (π = {π, π} β ((β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π})))) |
176 | 175 | com12 32 |
. . . . . . . . . . . . 13
β’ (π = {π, π} β ((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β ((β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π})))) |
177 | 176 | adantr 482 |
. . . . . . . . . . . 12
β’ ((π = {π, π} β§ π β π) β ((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β ((β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π})))) |
178 | 177 | impcom 409 |
. . . . . . . . . . 11
β’
(((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β ((β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π) β (β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© = β¨inf({π, π}, π, π
), sup({π, π}, π, π
)β© β {π, π} = {π, π}))) |
179 | 162, 178 | mpbird 257 |
. . . . . . . . . 10
β’
(((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π)) |
180 | 179 | ex 414 |
. . . . . . . . 9
β’ ((((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β§ (π β π β§ π β π)) β ((π = {π, π} β§ π β π) β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π))) |
181 | 180 | rexlimdvva 3212 |
. . . . . . . 8
β’ (((π
Or π β§ (π β π β§ π β π)) β§ (π = {π, π} β§ π β π)) β (βπ β π βπ β π (π = {π, π} β§ π β π) β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π))) |
182 | 181 | ex 414 |
. . . . . . 7
β’ ((π
Or π β§ (π β π β§ π β π)) β ((π = {π, π} β§ π β π) β (βπ β π βπ β π (π = {π, π} β§ π β π) β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π)))) |
183 | 182 | rexlimdvva 3212 |
. . . . . 6
β’ (π
Or π β (βπ β π βπ β π (π = {π, π} β§ π β π) β (βπ β π βπ β π (π = {π, π} β§ π β π) β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π)))) |
184 | 183 | com13 88 |
. . . . 5
β’
(βπ β
π βπ β π (π = {π, π} β§ π β π) β (βπ β π βπ β π (π = {π, π} β§ π β π) β (π
Or π β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π)))) |
185 | 19, 184 | biimtrid 241 |
. . . 4
β’
(βπ β
π βπ β π (π = {π, π} β§ π β π) β (π β π β (π
Or π β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π)))) |
186 | 18, 185 | sylbi 216 |
. . 3
β’ (π β π β (π β π β (π
Or π β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π)))) |
187 | 186 | 3imp31 1113 |
. 2
β’ ((π
Or π β§ π β π β§ π β π) β (β¨inf(π, π, π
), sup(π, π, π
)β© = β¨inf(π, π, π
), sup(π, π, π
)β© β π = π)) |
188 | 16, 187 | sylbid 239 |
1
β’ ((π
Or π β§ π β π β§ π β π) β ((πΉβπ) = (πΉβπ) β π = π)) |