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Mirrors > Home > MPE Home > Th. List > ssab | Structured version Visualization version Unicode version |
Description: Subclass of a class abstraction. (Contributed by NM, 16-Aug-2006.) |
Ref | Expression |
---|---|
ssab |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | abid2 2745 | . . 3 | |
2 | 1 | sseq1i 3629 | . 2 |
3 | ss2ab 3670 | . 2 | |
4 | 2, 3 | bitr3i 266 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wal 1481 wcel 1990 cab 2608 wss 3574 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-in 3581 df-ss 3588 |
This theorem is referenced by: ssabral 3673 ssrab 3680 wdomd 8486 ixpiunwdom 8496 lidldvgen 19255 prdsxmslem2 22334 ballotlem2 30550 |
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