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Related theorems GIF version |
| Description: Substitution of equality into a subclass relationship. |
| Ref | Expression |
|---|---|
| sseqtrd.1 | ⊢ (φ → A ⊆ B) |
| sseqtrd.2 | ⊢ (φ → B = C) |
| Ref | Expression |
|---|---|
| sseqtrd | ⊢ (φ → A ⊆ C) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseqtrd.1 | . 2 ⊢ (φ → A ⊆ B) | |
| 2 | sseqtrd.2 | . . 3 ⊢ (φ → B = C) | |
| 3 | 2 | sseq2d 2141 | . 2 ⊢ (φ → (A ⊆ B ↔ A ⊆ C)) |
| 4 | 1, 3 | mpbid 193 | 1 ⊢ (φ → A ⊆ C) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 = wceq 992 ⊆ wss 2099 |
| This theorem is referenced by: sseqtr4d 2150 fconst4 3965 fparlem3 4201 fparlem4 4202 nnaword2 4385 unifi 4701 r1val1 4804 rankr1id 4843 fodom 4944 tgcl 7836 tgss2 7849 2basgen 7853 bastop2 7855 clsss2 7913 iscncl 7980 cnconst 7990 dnsconst 7998 unirnbl 8085 metelcls 8176 bnsscmcl 8785 shsub2 9565 ococin 9573 spanssoc 9595 shub2 9629 chub2 9707 spanpr 9779 ssmd1 10519 mdslj1i 10527 mdslj2i 10528 mdslmd3i 10540 mdexchi 10543 irredlem1 10599 atcvat3i 10605 atcvat4i 10606 mdsymlem1 10612 mdsymlem5 10616 fictblem 11422 finsschain 11425 opnregcld 11467 cncls 11473 cnntr 11474 cptclsscpt 11489 uncomp 11490 compfipin0lem 11492 alexsublem3 11498 alexsublem4 11499 subtopmetlem 11505 reconnlem1 11507 2ndcsb 11537 2ndcctbss 11539 topfneec 11562 fnessref 11564 topjoin 11588 isnrm2 11613 filssufillem 11655 ufinffr 11663 elfilmap3 11692 rnelfmlem 11698 rnelfm 11699 fmfnfmlem2 11701 fmfnfmlem4 11703 fmfnfm 11704 fcluscf 11724 flimfnfcls 11727 fcluscomplem 11732 tailmap 11759 filnetlem5 11767 fzm1 11867 cnimass 11949 cnss 11953 paste 11954 hmeocld 11961 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 998 ax-gen 999 ax-8 1000 ax-10 1002 ax-12 1004 ax-17 1007 ax-4 1009 ax-5o 1011 ax-6o 1014 ax-9o 1159 ax-10o 1177 ax-16 1247 ax-11o 1255 ax-ext 1500 |
| This theorem depends on definitions: df-bi 145 df-an 223 df-ex 1017 df-sb 1209 df-clab 1506 df-cleq 1511 df-clel 1514 df-in 2103 df-ss 2105 |