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Mirrors > Home > ILE Home > Th. List > eqsstri | GIF version |
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 16-Jul-1995.) |
Ref | Expression |
---|---|
eqsstr.1 | ⊢ 𝐴 = 𝐵 |
eqsstr.2 | ⊢ 𝐵 ⊆ 𝐶 |
Ref | Expression |
---|---|
eqsstri | ⊢ 𝐴 ⊆ 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqsstr.2 | . 2 ⊢ 𝐵 ⊆ 𝐶 | |
2 | eqsstr.1 | . . 3 ⊢ 𝐴 = 𝐵 | |
3 | 2 | sseq1i 3023 | . 2 ⊢ (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶) |
4 | 1, 3 | mpbir 144 | 1 ⊢ 𝐴 ⊆ 𝐶 |
Colors of variables: wff set class |
Syntax hints: = wceq 1284 ⊆ wss 2973 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-11 1437 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-in 2979 df-ss 2986 |
This theorem is referenced by: eqsstr3i 3030 ssrab2 3079 rabssab 3081 difdifdirss 3327 opabss 3842 brab2ga 4433 relopabi 4481 dmopabss 4565 resss 4653 relres 4657 exse2 4719 rnin 4753 rnxpss 4774 cnvcnvss 4795 dmmptss 4837 fnres 5035 resasplitss 5089 fabexg 5097 f0 5100 ffvresb 5349 isoini2 5478 dmoprabss 5606 elmpt2cl 5718 tposssxp 5887 dftpos4 5901 smores 5930 smores2 5932 iordsmo 5935 swoer 6157 swoord1 6158 swoord2 6159 ecss 6170 ecopovsym 6225 ecopovtrn 6226 ecopover 6227 ecopovsymg 6228 ecopovtrng 6229 ecopoverg 6230 pinn 6499 niex 6502 ltrelpi 6514 dmaddpi 6515 dmmulpi 6516 enqex 6550 ltrelnq 6555 enq0ex 6629 ltrelpr 6695 enrex 6914 ltrelsr 6915 ltrelre 7001 ltrelxr 7173 lerelxr 7175 nn0ssre 8292 nn0ssz 8369 rpre 8740 cau3 10001 dvdszrcl 10200 dvdsflip 10251 infssuzcldc 10347 |
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