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Mirrors > Home > NFE Home > Th. List > sseq12d | Unicode version |
Description: An equality deduction for the subclass relationship. (Contributed by NM, 31-May-1999.) |
Ref | Expression |
---|---|
sseq1d.1 | |
sseq12d.2 |
Ref | Expression |
---|---|
sseq12d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1d.1 | . . 3 | |
2 | 1 | sseq1d 3298 | . 2 |
3 | sseq12d.2 | . . 3 | |
4 | 3 | sseq2d 3299 | . 2 |
5 | 2, 4 | bitrd 244 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 176 wceq 1642 wss 3257 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-7 1734 ax-11 1746 ax-12 1925 ax-ext 2334 |
This theorem depends on definitions: df-bi 177 df-or 359 df-an 360 df-nan 1288 df-tru 1319 df-ex 1542 df-nf 1545 df-sb 1649 df-clab 2340 df-cleq 2346 df-clel 2349 df-nfc 2478 df-v 2861 df-nin 3211 df-compl 3212 df-in 3213 df-ss 3259 |
This theorem is referenced by: 3sstr3d 3313 3sstr4d 3314 ssdifeq0 3632 clos1induct 5880 frecxp 6314 frecxpg 6315 |
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