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Mirrors > Home > ILE Home > Th. List > sstrd | Unicode version |
Description: Subclass transitivity deduction. (Contributed by NM, 2-Jun-2004.) |
Ref | Expression |
---|---|
sstrd.1 | |
sstrd.2 |
Ref | Expression |
---|---|
sstrd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sstrd.1 | . 2 | |
2 | sstrd.2 | . 2 | |
3 | sstr 2953 | . 2 | |
4 | 1, 2, 3 | syl2anc 391 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wss 2917 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-11 1397 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-in 2924 df-ss 2931 |
This theorem is referenced by: syl5ss 2956 syl6ss 2957 ssdif2d 3082 tfisi 4310 funss 4920 fssxp 5058 fvmptssdm 5255 suppssfv 5708 suppssov1 5709 tposss 5861 tfrlem1 5923 tfrlemibfn 5942 ecinxp 6181 |
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