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| Mirrors > Home > ILE Home > Th. List > ssopab2b | Unicode version | ||
| Description: Equivalence of ordered pair abstraction subclass and implication. (Contributed by NM, 27-Dec-1996.) (Proof shortened by Mario Carneiro, 18-Nov-2016.) |
| Ref | Expression |
|---|---|
| ssopab2b |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfopab1 4158 |
. . . 4
| |
| 2 | nfopab1 4158 |
. . . 4
| |
| 3 | 1, 2 | nfss 3220 |
. . 3
|
| 4 | nfopab2 4159 |
. . . . 5
| |
| 5 | nfopab2 4159 |
. . . . 5
| |
| 6 | 4, 5 | nfss 3220 |
. . . 4
|
| 7 | ssel 3221 |
. . . . 5
| |
| 8 | opabid 4350 |
. . . . 5
| |
| 9 | opabid 4350 |
. . . . 5
| |
| 10 | 7, 8, 9 | 3imtr3g 204 |
. . . 4
|
| 11 | 6, 10 | alrimi 1570 |
. . 3
|
| 12 | 3, 11 | alrimi 1570 |
. 2
|
| 13 | ssopab2 4370 |
. 2
| |
| 14 | 12, 13 | impbii 126 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-v 2804 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-opab 4151 |
| This theorem is referenced by: eqopab2b 4374 dffun2 5336 |
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