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Related theorems GIF version |
| Description: Substitution of equality into a subclass relationship. |
| Ref | Expression |
|---|---|
| eqsstrd.1 | ⊢ (φ → A = B) |
| eqsstrd.2 | ⊢ (φ → B ⊆ C) |
| Ref | Expression |
|---|---|
| eqsstrd | ⊢ (φ → A ⊆ C) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqsstrd.2 | . 2 ⊢ (φ → B ⊆ C) | |
| 2 | eqsstrd.1 | . . 3 ⊢ (φ → A = B) | |
| 3 | 2 | sseq1d 2091 | . 2 ⊢ (φ → (A ⊆ C ↔ B ⊆ C)) |
| 4 | 1, 3 | mpbird 196 | 1 ⊢ (φ → A ⊆ C) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 = wceq 958 ⊆ wss 2050 |
| This theorem is referenced by: eqsstr3d 2099 snsspr 2474 fimacnv 3816 oawordeulem 4194 oewordri 4225 oaabslem 4257 mapsspw 4347 fodomr 4489 r1val1 4668 cardonle 4832 carduniima 4901 cfub 4920 cflecard 4924 uzssz 6431 infxpidmlem7 7559 infxpidmlem8 7560 ntrss2 7687 lpsscls 7742 cnconst 7777 blssm 7847 rnblssm 7848 opnfss 7855 tgioolem 7911 chssoct 9414 specclt 9820 elnlfn2t 9848 mdsl0 10232 mdexch 10257 atcvat3 10318 dmdbr5at 10344 clsrebb 10479 subsp 10540 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-12 970 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 983 df-sb 1174 df-clab 1467 df-cleq 1472 df-clel 1475 df-in 2054 df-ss 2056 |