Step | Hyp | Ref
| Expression |
1 | | 1nn0 12485 |
. . . . . . 7
β’ 1 β
β0 |
2 | | 0nn0 12484 |
. . . . . . 7
β’ 0 β
β0 |
3 | 1, 2 | ifcli 4575 |
. . . . . 6
β’ if(π₯ = πΎ, 1, 0) β
β0 |
4 | 3 | a1i 11 |
. . . . 5
β’
((β€ β§ π₯
β πΌ) β if(π₯ = πΎ, 1, 0) β
β0) |
5 | 4 | fmpttd 7112 |
. . . 4
β’ (β€
β (π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)):πΌβΆβ0) |
6 | 5 | mptru 1549 |
. . 3
β’ (π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)):πΌβΆβ0 |
7 | | eqid 2733 |
. . . . 5
β’ (π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) = (π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) |
8 | 7 | mptpreima 6235 |
. . . 4
β’ (β‘(π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) β β) = {π₯ β πΌ β£ if(π₯ = πΎ, 1, 0) β β} |
9 | | snfi 9041 |
. . . . . 6
β’ {πΎ} β Fin |
10 | | inss1 4228 |
. . . . . . 7
β’ ({π₯ β£ π₯ = πΎ} β© πΌ) β {π₯ β£ π₯ = πΎ} |
11 | | dfrab2 4310 |
. . . . . . 7
β’ {π₯ β πΌ β£ π₯ = πΎ} = ({π₯ β£ π₯ = πΎ} β© πΌ) |
12 | | df-sn 4629 |
. . . . . . 7
β’ {πΎ} = {π₯ β£ π₯ = πΎ} |
13 | 10, 11, 12 | 3sstr4i 4025 |
. . . . . 6
β’ {π₯ β πΌ β£ π₯ = πΎ} β {πΎ} |
14 | | ssfi 9170 |
. . . . . 6
β’ (({πΎ} β Fin β§ {π₯ β πΌ β£ π₯ = πΎ} β {πΎ}) β {π₯ β πΌ β£ π₯ = πΎ} β Fin) |
15 | 9, 13, 14 | mp2an 691 |
. . . . 5
β’ {π₯ β πΌ β£ π₯ = πΎ} β Fin |
16 | | 0nnn 12245 |
. . . . . . . . 9
β’ Β¬ 0
β β |
17 | | iffalse 4537 |
. . . . . . . . . 10
β’ (Β¬
π₯ = πΎ β if(π₯ = πΎ, 1, 0) = 0) |
18 | 17 | eleq1d 2819 |
. . . . . . . . 9
β’ (Β¬
π₯ = πΎ β (if(π₯ = πΎ, 1, 0) β β β 0 β
β)) |
19 | 16, 18 | mtbiri 327 |
. . . . . . . 8
β’ (Β¬
π₯ = πΎ β Β¬ if(π₯ = πΎ, 1, 0) β β) |
20 | 19 | con4i 114 |
. . . . . . 7
β’ (if(π₯ = πΎ, 1, 0) β β β π₯ = πΎ) |
21 | 20 | a1i 11 |
. . . . . 6
β’ (π₯ β πΌ β (if(π₯ = πΎ, 1, 0) β β β π₯ = πΎ)) |
22 | 21 | ss2rabi 4074 |
. . . . 5
β’ {π₯ β πΌ β£ if(π₯ = πΎ, 1, 0) β β} β {π₯ β πΌ β£ π₯ = πΎ} |
23 | | ssfi 9170 |
. . . . 5
β’ (({π₯ β πΌ β£ π₯ = πΎ} β Fin β§ {π₯ β πΌ β£ if(π₯ = πΎ, 1, 0) β β} β {π₯ β πΌ β£ π₯ = πΎ}) β {π₯ β πΌ β£ if(π₯ = πΎ, 1, 0) β β} β
Fin) |
24 | 15, 22, 23 | mp2an 691 |
. . . 4
β’ {π₯ β πΌ β£ if(π₯ = πΎ, 1, 0) β β} β
Fin |
25 | 8, 24 | eqeltri 2830 |
. . 3
β’ (β‘(π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) β β) β
Fin |
26 | 6, 25 | pm3.2i 472 |
. 2
β’ ((π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)):πΌβΆβ0 β§ (β‘(π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) β β) β
Fin) |
27 | | psrbag0.d |
. . 3
β’ π· = {π β (β0
βm πΌ)
β£ (β‘π β β) β
Fin} |
28 | 27 | psrbag 21462 |
. 2
β’ (πΌ β π β ((π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) β π· β ((π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)):πΌβΆβ0 β§ (β‘(π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) β β) β
Fin))) |
29 | 26, 28 | mpbiri 258 |
1
β’ (πΌ β π β (π₯ β πΌ β¦ if(π₯ = πΎ, 1, 0)) β π·) |