Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > ssab | Unicode version |
Description: Subclass of a class abstraction. (Contributed by NM, 16-Aug-2006.) |
Ref | Expression |
---|---|
ssab |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | abid2 2285 | . . 3 | |
2 | 1 | sseq1i 3163 | . 2 |
3 | ss2ab 3205 | . 2 | |
4 | 2, 3 | bitr3i 185 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 104 wal 1340 wcel 2135 cab 2150 wss 3111 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-in 3117 df-ss 3124 |
This theorem is referenced by: ssabral 3208 ssrab 3215 |
Copyright terms: Public domain | W3C validator |