Step | Hyp | Ref
| Expression |
1 | | cycpmco2.c |
. . . 4
β’ π = (toCycβπ·) |
2 | | cycpmco2.d |
. . . 4
β’ (π β π· β π) |
3 | | cycpmco2.1 |
. . . . 5
β’ π = (π splice β¨πΈ, πΈ, β¨βπΌββ©β©) |
4 | | ssrab2 4077 |
. . . . . . 7
β’ {π€ β Word π· β£ π€:dom π€β1-1βπ·} β Word π· |
5 | | cycpmco2.w |
. . . . . . . 8
β’ (π β π β dom π) |
6 | | cycpmco2.s |
. . . . . . . . . . 11
β’ π = (SymGrpβπ·) |
7 | | eqid 2733 |
. . . . . . . . . . 11
β’
(Baseβπ) =
(Baseβπ) |
8 | 1, 6, 7 | tocycf 32264 |
. . . . . . . . . 10
β’ (π· β π β π:{π€ β Word π· β£ π€:dom π€β1-1βπ·}βΆ(Baseβπ)) |
9 | 2, 8 | syl 17 |
. . . . . . . . 9
β’ (π β π:{π€ β Word π· β£ π€:dom π€β1-1βπ·}βΆ(Baseβπ)) |
10 | 9 | fdmd 6726 |
. . . . . . . 8
β’ (π β dom π = {π€ β Word π· β£ π€:dom π€β1-1βπ·}) |
11 | 5, 10 | eleqtrd 2836 |
. . . . . . 7
β’ (π β π β {π€ β Word π· β£ π€:dom π€β1-1βπ·}) |
12 | 4, 11 | sselid 3980 |
. . . . . 6
β’ (π β π β Word π·) |
13 | | cycpmco2.i |
. . . . . . . 8
β’ (π β πΌ β (π· β ran π)) |
14 | 13 | eldifad 3960 |
. . . . . . 7
β’ (π β πΌ β π·) |
15 | 14 | s1cld 14550 |
. . . . . 6
β’ (π β β¨βπΌββ© β Word π·) |
16 | | splcl 14699 |
. . . . . 6
β’ ((π β Word π· β§ β¨βπΌββ© β Word π·) β (π splice β¨πΈ, πΈ, β¨βπΌββ©β©) β Word π·) |
17 | 12, 15, 16 | syl2anc 585 |
. . . . 5
β’ (π β (π splice β¨πΈ, πΈ, β¨βπΌββ©β©) β Word π·) |
18 | 3, 17 | eqeltrid 2838 |
. . . 4
β’ (π β π β Word π·) |
19 | | cycpmco2.j |
. . . . 5
β’ (π β π½ β ran π) |
20 | | cycpmco2.e |
. . . . 5
β’ πΈ = ((β‘πβπ½) + 1) |
21 | 1, 6, 2, 5, 13, 19, 20, 3 | cycpmco2f1 32271 |
. . . 4
β’ (π β π:dom πβ1-1βπ·) |
22 | | id 22 |
. . . . . . . . . . . . . . . 16
β’ (π€ = π β π€ = π) |
23 | | dmeq 5902 |
. . . . . . . . . . . . . . . 16
β’ (π€ = π β dom π€ = dom π) |
24 | | eqidd 2734 |
. . . . . . . . . . . . . . . 16
β’ (π€ = π β π· = π·) |
25 | 22, 23, 24 | f1eq123d 6823 |
. . . . . . . . . . . . . . 15
β’ (π€ = π β (π€:dom π€β1-1βπ· β π:dom πβ1-1βπ·)) |
26 | 25 | elrab 3683 |
. . . . . . . . . . . . . 14
β’ (π β {π€ β Word π· β£ π€:dom π€β1-1βπ·} β (π β Word π· β§ π:dom πβ1-1βπ·)) |
27 | 11, 26 | sylib 217 |
. . . . . . . . . . . . 13
β’ (π β (π β Word π· β§ π:dom πβ1-1βπ·)) |
28 | 27 | simprd 497 |
. . . . . . . . . . . 12
β’ (π β π:dom πβ1-1βπ·) |
29 | | f1cnv 6855 |
. . . . . . . . . . . 12
β’ (π:dom πβ1-1βπ· β β‘π:ran πβ1-1-ontoβdom
π) |
30 | | f1of 6831 |
. . . . . . . . . . . 12
β’ (β‘π:ran πβ1-1-ontoβdom
π β β‘π:ran πβΆdom π) |
31 | 28, 29, 30 | 3syl 18 |
. . . . . . . . . . 11
β’ (π β β‘π:ran πβΆdom π) |
32 | 31, 19 | ffvelcdmd 7085 |
. . . . . . . . . 10
β’ (π β (β‘πβπ½) β dom π) |
33 | | wrddm 14468 |
. . . . . . . . . . 11
β’ (π β Word π· β dom π = (0..^(β―βπ))) |
34 | 12, 33 | syl 17 |
. . . . . . . . . 10
β’ (π β dom π = (0..^(β―βπ))) |
35 | 32, 34 | eleqtrd 2836 |
. . . . . . . . 9
β’ (π β (β‘πβπ½) β (0..^(β―βπ))) |
36 | | fzofzp1 13726 |
. . . . . . . . 9
β’ ((β‘πβπ½) β (0..^(β―βπ)) β ((β‘πβπ½) + 1) β (0...(β―βπ))) |
37 | 35, 36 | syl 17 |
. . . . . . . 8
β’ (π β ((β‘πβπ½) + 1) β (0...(β―βπ))) |
38 | 20, 37 | eqeltrid 2838 |
. . . . . . 7
β’ (π β πΈ β (0...(β―βπ))) |
39 | | elfzuz3 13495 |
. . . . . . 7
β’ (πΈ β
(0...(β―βπ))
β (β―βπ)
β (β€β₯βπΈ)) |
40 | | fzoss2 13657 |
. . . . . . 7
β’
((β―βπ)
β (β€β₯βπΈ) β (0..^πΈ) β (0..^(β―βπ))) |
41 | 38, 39, 40 | 3syl 18 |
. . . . . 6
β’ (π β (0..^πΈ) β (0..^(β―βπ))) |
42 | 1, 6, 2, 5, 13, 19, 20, 3 | cycpmco2lem3 32275 |
. . . . . . 7
β’ (π β ((β―βπ) β 1) =
(β―βπ)) |
43 | 42 | oveq2d 7422 |
. . . . . 6
β’ (π β (0..^((β―βπ) β 1)) =
(0..^(β―βπ))) |
44 | 41, 43 | sseqtrrd 4023 |
. . . . 5
β’ (π β (0..^πΈ) β (0..^((β―βπ) β 1))) |
45 | | cycpmco2lem7.3 |
. . . . 5
β’ (π β (β‘πβπΎ) β (0..^πΈ)) |
46 | 44, 45 | sseldd 3983 |
. . . 4
β’ (π β (β‘πβπΎ) β (0..^((β―βπ) β 1))) |
47 | 1, 2, 18, 21, 46 | cycpmfv1 32260 |
. . 3
β’ (π β ((πβπ)β(πβ(β‘πβπΎ))) = (πβ((β‘πβπΎ) + 1))) |
48 | | cycpmco2lem7.1 |
. . . 4
β’ (π β πΎ β ran π) |
49 | | f1f1orn 6842 |
. . . . . . 7
β’ (π:dom πβ1-1βπ· β π:dom πβ1-1-ontoβran
π) |
50 | 21, 49 | syl 17 |
. . . . . 6
β’ (π β π:dom πβ1-1-ontoβran
π) |
51 | | ssun1 4172 |
. . . . . . . 8
β’ ran π β (ran π βͺ {πΌ}) |
52 | 1, 6, 2, 5, 13, 19, 20, 3 | cycpmco2rn 32272 |
. . . . . . . 8
β’ (π β ran π = (ran π βͺ {πΌ})) |
53 | 51, 52 | sseqtrrid 4035 |
. . . . . . 7
β’ (π β ran π β ran π) |
54 | 53 | sselda 3982 |
. . . . . 6
β’ ((π β§ πΎ β ran π) β πΎ β ran π) |
55 | | f1ocnvfv2 7272 |
. . . . . 6
β’ ((π:dom πβ1-1-ontoβran
π β§ πΎ β ran π) β (πβ(β‘πβπΎ)) = πΎ) |
56 | 50, 54, 55 | syl2an2r 684 |
. . . . 5
β’ ((π β§ πΎ β ran π) β (πβ(β‘πβπΎ)) = πΎ) |
57 | 56 | fveq2d 6893 |
. . . 4
β’ ((π β§ πΎ β ran π) β ((πβπ)β(πβ(β‘πβπΎ))) = ((πβπ)βπΎ)) |
58 | 48, 57 | mpdan 686 |
. . 3
β’ (π β ((πβπ)β(πβ(β‘πβπΎ))) = ((πβπ)βπΎ)) |
59 | | f1f1orn 6842 |
. . . . . . . 8
β’ (π:dom πβ1-1βπ· β π:dom πβ1-1-ontoβran
π) |
60 | 28, 59 | syl 17 |
. . . . . . 7
β’ (π β π:dom πβ1-1-ontoβran
π) |
61 | 41, 34 | sseqtrrd 4023 |
. . . . . . . 8
β’ (π β (0..^πΈ) β dom π) |
62 | 61, 45 | sseldd 3983 |
. . . . . . 7
β’ (π β (β‘πβπΎ) β dom π) |
63 | | f1ocnvfv1 7271 |
. . . . . . 7
β’ ((π:dom πβ1-1-ontoβran
π β§ (β‘πβπΎ) β dom π) β (β‘πβ(πβ(β‘πβπΎ))) = (β‘πβπΎ)) |
64 | 60, 62, 63 | syl2anc 585 |
. . . . . 6
β’ (π β (β‘πβ(πβ(β‘πβπΎ))) = (β‘πβπΎ)) |
65 | 3 | fveq1i 6890 |
. . . . . . . . 9
β’ (πβ(β‘πβπΎ)) = ((π splice β¨πΈ, πΈ, β¨βπΌββ©β©)β(β‘πβπΎ)) |
66 | | fz0ssnn0 13593 |
. . . . . . . . . . . 12
β’
(0...(β―βπ)) β
β0 |
67 | 66, 38 | sselid 3980 |
. . . . . . . . . . 11
β’ (π β πΈ β
β0) |
68 | | nn0fz0 13596 |
. . . . . . . . . . 11
β’ (πΈ β β0
β πΈ β (0...πΈ)) |
69 | 67, 68 | sylib 217 |
. . . . . . . . . 10
β’ (π β πΈ β (0...πΈ)) |
70 | 12, 69, 38, 15, 45 | splfv1 14702 |
. . . . . . . . 9
β’ (π β ((π splice β¨πΈ, πΈ, β¨βπΌββ©β©)β(β‘πβπΎ)) = (πβ(β‘πβπΎ))) |
71 | 65, 70 | eqtrid 2785 |
. . . . . . . 8
β’ (π β (πβ(β‘πβπΎ)) = (πβ(β‘πβπΎ))) |
72 | 48, 56 | mpdan 686 |
. . . . . . . 8
β’ (π β (πβ(β‘πβπΎ)) = πΎ) |
73 | 71, 72 | eqtr3d 2775 |
. . . . . . 7
β’ (π β (πβ(β‘πβπΎ)) = πΎ) |
74 | 73 | fveq2d 6893 |
. . . . . 6
β’ (π β (β‘πβ(πβ(β‘πβπΎ))) = (β‘πβπΎ)) |
75 | 64, 74 | eqtr3d 2775 |
. . . . 5
β’ (π β (β‘πβπΎ) = (β‘πβπΎ)) |
76 | 75 | oveq1d 7421 |
. . . 4
β’ (π β ((β‘πβπΎ) + 1) = ((β‘πβπΎ) + 1)) |
77 | 76 | fveq2d 6893 |
. . 3
β’ (π β (πβ((β‘πβπΎ) + 1)) = (πβ((β‘πβπΎ) + 1))) |
78 | 47, 58, 77 | 3eqtr3d 2781 |
. 2
β’ (π β ((πβπ)βπΎ) = (πβ((β‘πβπΎ) + 1))) |
79 | 3 | a1i 11 |
. . . . 5
β’ (π β π = (π splice β¨πΈ, πΈ, β¨βπΌββ©β©)) |
80 | 79 | fveq1d 6891 |
. . . 4
β’ (π β (πβ((β‘πβπΎ) + 1)) = ((π splice β¨πΈ, πΈ, β¨βπΌββ©β©)β((β‘πβπΎ) + 1))) |
81 | 38 | elfzelzd 13499 |
. . . . . . 7
β’ (π β πΈ β β€) |
82 | | simpr 486 |
. . . . . . . 8
β’ ((π β§ (β‘πβπΎ) β (0..^(πΈ β 1))) β (β‘πβπΎ) β (0..^(πΈ β 1))) |
83 | 20 | a1i 11 |
. . . . . . . . . . . . . . 15
β’ (π β πΈ = ((β‘πβπ½) + 1)) |
84 | 83 | oveq1d 7421 |
. . . . . . . . . . . . . 14
β’ (π β (πΈ β 1) = (((β‘πβπ½) + 1) β 1)) |
85 | | elfzonn0 13674 |
. . . . . . . . . . . . . . . . 17
β’ ((β‘πβπ½) β (0..^(β―βπ)) β (β‘πβπ½) β
β0) |
86 | 35, 85 | syl 17 |
. . . . . . . . . . . . . . . 16
β’ (π β (β‘πβπ½) β
β0) |
87 | 86 | nn0cnd 12531 |
. . . . . . . . . . . . . . 15
β’ (π β (β‘πβπ½) β β) |
88 | | 1cnd 11206 |
. . . . . . . . . . . . . . 15
β’ (π β 1 β
β) |
89 | 87, 88 | pncand 11569 |
. . . . . . . . . . . . . 14
β’ (π β (((β‘πβπ½) + 1) β 1) = (β‘πβπ½)) |
90 | 84, 89 | eqtr2d 2774 |
. . . . . . . . . . . . 13
β’ (π β (β‘πβπ½) = (πΈ β 1)) |
91 | 90 | adantr 482 |
. . . . . . . . . . . 12
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (β‘πβπ½) = (πΈ β 1)) |
92 | | simpr 486 |
. . . . . . . . . . . 12
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (β‘πβπΎ) = (πΈ β 1)) |
93 | 75 | adantr 482 |
. . . . . . . . . . . 12
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (β‘πβπΎ) = (β‘πβπΎ)) |
94 | 91, 92, 93 | 3eqtr2rd 2780 |
. . . . . . . . . . 11
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (β‘πβπΎ) = (β‘πβπ½)) |
95 | 94 | fveq2d 6893 |
. . . . . . . . . 10
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (πβ(β‘πβπΎ)) = (πβ(β‘πβπ½))) |
96 | | f1ocnvfv2 7272 |
. . . . . . . . . . . 12
β’ ((π:dom πβ1-1-ontoβran
π β§ πΎ β ran π) β (πβ(β‘πβπΎ)) = πΎ) |
97 | 60, 48, 96 | syl2anc 585 |
. . . . . . . . . . 11
β’ (π β (πβ(β‘πβπΎ)) = πΎ) |
98 | 97 | adantr 482 |
. . . . . . . . . 10
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (πβ(β‘πβπΎ)) = πΎ) |
99 | | f1ocnvfv2 7272 |
. . . . . . . . . . . 12
β’ ((π:dom πβ1-1-ontoβran
π β§ π½ β ran π) β (πβ(β‘πβπ½)) = π½) |
100 | 60, 19, 99 | syl2anc 585 |
. . . . . . . . . . 11
β’ (π β (πβ(β‘πβπ½)) = π½) |
101 | 100 | adantr 482 |
. . . . . . . . . 10
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (πβ(β‘πβπ½)) = π½) |
102 | 95, 98, 101 | 3eqtr3d 2781 |
. . . . . . . . 9
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β πΎ = π½) |
103 | | cycpmco2lem7.2 |
. . . . . . . . . 10
β’ (π β πΎ β π½) |
104 | 103 | adantr 482 |
. . . . . . . . 9
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β πΎ β π½) |
105 | 102, 104 | pm2.21ddne 3027 |
. . . . . . . 8
β’ ((π β§ (β‘πβπΎ) = (πΈ β 1)) β (β‘πβπΎ) β (0..^(πΈ β 1))) |
106 | | 0zd 12567 |
. . . . . . . . . . 11
β’ (π β 0 β
β€) |
107 | | nn0p1nn 12508 |
. . . . . . . . . . . . . 14
β’ ((β‘πβπ½) β β0 β ((β‘πβπ½) + 1) β β) |
108 | 86, 107 | syl 17 |
. . . . . . . . . . . . 13
β’ (π β ((β‘πβπ½) + 1) β β) |
109 | 20, 108 | eqeltrid 2838 |
. . . . . . . . . . . 12
β’ (π β πΈ β β) |
110 | | 0p1e1 12331 |
. . . . . . . . . . . . . 14
β’ (0 + 1) =
1 |
111 | 110 | fveq2i 6892 |
. . . . . . . . . . . . 13
β’
(β€β₯β(0 + 1)) =
(β€β₯β1) |
112 | | nnuz 12862 |
. . . . . . . . . . . . 13
β’ β =
(β€β₯β1) |
113 | 111, 112 | eqtr4i 2764 |
. . . . . . . . . . . 12
β’
(β€β₯β(0 + 1)) = β |
114 | 109, 113 | eleqtrrdi 2845 |
. . . . . . . . . . 11
β’ (π β πΈ β (β€β₯β(0 +
1))) |
115 | | fzosplitsnm1 13704 |
. . . . . . . . . . 11
β’ ((0
β β€ β§ πΈ
β (β€β₯β(0 + 1))) β (0..^πΈ) = ((0..^(πΈ β 1)) βͺ {(πΈ β 1)})) |
116 | 106, 114,
115 | syl2anc 585 |
. . . . . . . . . 10
β’ (π β (0..^πΈ) = ((0..^(πΈ β 1)) βͺ {(πΈ β 1)})) |
117 | 45, 116 | eleqtrd 2836 |
. . . . . . . . 9
β’ (π β (β‘πβπΎ) β ((0..^(πΈ β 1)) βͺ {(πΈ β 1)})) |
118 | | fvex 6902 |
. . . . . . . . . 10
β’ (β‘πβπΎ) β V |
119 | | elunsn 31738 |
. . . . . . . . . 10
β’ ((β‘πβπΎ) β V β ((β‘πβπΎ) β ((0..^(πΈ β 1)) βͺ {(πΈ β 1)}) β ((β‘πβπΎ) β (0..^(πΈ β 1)) β¨ (β‘πβπΎ) = (πΈ β 1)))) |
120 | 118, 119 | ax-mp 5 |
. . . . . . . . 9
β’ ((β‘πβπΎ) β ((0..^(πΈ β 1)) βͺ {(πΈ β 1)}) β ((β‘πβπΎ) β (0..^(πΈ β 1)) β¨ (β‘πβπΎ) = (πΈ β 1))) |
121 | 117, 120 | sylib 217 |
. . . . . . . 8
β’ (π β ((β‘πβπΎ) β (0..^(πΈ β 1)) β¨ (β‘πβπΎ) = (πΈ β 1))) |
122 | 82, 105, 121 | mpjaodan 958 |
. . . . . . 7
β’ (π β (β‘πβπΎ) β (0..^(πΈ β 1))) |
123 | | elfzom1elp1fzo 13696 |
. . . . . . 7
β’ ((πΈ β β€ β§ (β‘πβπΎ) β (0..^(πΈ β 1))) β ((β‘πβπΎ) + 1) β (0..^πΈ)) |
124 | 81, 122, 123 | syl2anc 585 |
. . . . . 6
β’ (π β ((β‘πβπΎ) + 1) β (0..^πΈ)) |
125 | 76, 124 | eqeltrrd 2835 |
. . . . 5
β’ (π β ((β‘πβπΎ) + 1) β (0..^πΈ)) |
126 | 12, 69, 38, 15, 125 | splfv1 14702 |
. . . 4
β’ (π β ((π splice β¨πΈ, πΈ, β¨βπΌββ©β©)β((β‘πβπΎ) + 1)) = (πβ((β‘πβπΎ) + 1))) |
127 | 80, 126 | eqtrd 2773 |
. . 3
β’ (π β (πβ((β‘πβπΎ) + 1)) = (πβ((β‘πβπΎ) + 1))) |
128 | | 1zzd 12590 |
. . . . . . . . 9
β’ (π β 1 β
β€) |
129 | 81, 128 | zsubcld 12668 |
. . . . . . . 8
β’ (π β (πΈ β 1) β β€) |
130 | | lencl 14480 |
. . . . . . . . . . 11
β’ (π β Word π· β (β―βπ) β
β0) |
131 | | nn0fz0 13596 |
. . . . . . . . . . . 12
β’
((β―βπ)
β β0 β (β―βπ) β (0...(β―βπ))) |
132 | 131 | biimpi 215 |
. . . . . . . . . . 11
β’
((β―βπ)
β β0 β (β―βπ) β (0...(β―βπ))) |
133 | 12, 130, 132 | 3syl 18 |
. . . . . . . . . 10
β’ (π β (β―βπ) β
(0...(β―βπ))) |
134 | 133 | elfzelzd 13499 |
. . . . . . . . 9
β’ (π β (β―βπ) β
β€) |
135 | 134, 128 | zsubcld 12668 |
. . . . . . . 8
β’ (π β ((β―βπ) β 1) β
β€) |
136 | 109 | nnred 12224 |
. . . . . . . . 9
β’ (π β πΈ β β) |
137 | 134 | zred 12663 |
. . . . . . . . 9
β’ (π β (β―βπ) β
β) |
138 | | 1red 11212 |
. . . . . . . . 9
β’ (π β 1 β
β) |
139 | | elfzle2 13502 |
. . . . . . . . . 10
β’ (πΈ β
(0...(β―βπ))
β πΈ β€
(β―βπ)) |
140 | 38, 139 | syl 17 |
. . . . . . . . 9
β’ (π β πΈ β€ (β―βπ)) |
141 | 136, 137,
138, 140 | lesub1dd 11827 |
. . . . . . . 8
β’ (π β (πΈ β 1) β€ ((β―βπ) β 1)) |
142 | | eluz 12833 |
. . . . . . . . 9
β’ (((πΈ β 1) β β€ β§
((β―βπ) β
1) β β€) β (((β―βπ) β 1) β
(β€β₯β(πΈ β 1)) β (πΈ β 1) β€ ((β―βπ) β 1))) |
143 | 142 | biimpar 479 |
. . . . . . . 8
β’ ((((πΈ β 1) β β€ β§
((β―βπ) β
1) β β€) β§ (πΈ
β 1) β€ ((β―βπ) β 1)) β ((β―βπ) β 1) β
(β€β₯β(πΈ β 1))) |
144 | 129, 135,
141, 143 | syl21anc 837 |
. . . . . . 7
β’ (π β ((β―βπ) β 1) β
(β€β₯β(πΈ β 1))) |
145 | | fzoss2 13657 |
. . . . . . 7
β’
(((β―βπ)
β 1) β (β€β₯β(πΈ β 1)) β (0..^(πΈ β 1)) β
(0..^((β―βπ)
β 1))) |
146 | 144, 145 | syl 17 |
. . . . . 6
β’ (π β (0..^(πΈ β 1)) β
(0..^((β―βπ)
β 1))) |
147 | 146, 122 | sseldd 3983 |
. . . . 5
β’ (π β (β‘πβπΎ) β (0..^((β―βπ) β 1))) |
148 | 75, 147 | eqeltrrd 2835 |
. . . 4
β’ (π β (β‘πβπΎ) β (0..^((β―βπ) β 1))) |
149 | 1, 2, 12, 28, 148 | cycpmfv1 32260 |
. . 3
β’ (π β ((πβπ)β(πβ(β‘πβπΎ))) = (πβ((β‘πβπΎ) + 1))) |
150 | 97 | fveq2d 6893 |
. . 3
β’ (π β ((πβπ)β(πβ(β‘πβπΎ))) = ((πβπ)βπΎ)) |
151 | 127, 149,
150 | 3eqtr2rd 2780 |
. 2
β’ (π β ((πβπ)βπΎ) = (πβ((β‘πβπΎ) + 1))) |
152 | 78, 151 | eqtr4d 2776 |
1
β’ (π β ((πβπ)βπΎ) = ((πβπ)βπΎ)) |