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Mirrors > Home > ILE Home > Th. List > eqeq2 | GIF version |
Description: Equality implies equivalence of equalities. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
eqeq2 | ⊢ (𝐴 = 𝐵 → (𝐶 = 𝐴 ↔ 𝐶 = 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeq1 2146 | . 2 ⊢ (𝐴 = 𝐵 → (𝐴 = 𝐶 ↔ 𝐵 = 𝐶)) | |
2 | eqcom 2141 | . 2 ⊢ (𝐶 = 𝐴 ↔ 𝐴 = 𝐶) | |
3 | eqcom 2141 | . 2 ⊢ (𝐶 = 𝐵 ↔ 𝐵 = 𝐶) | |
4 | 1, 2, 3 | 3bitr4g 222 | 1 ⊢ (𝐴 = 𝐵 → (𝐶 = 𝐴 ↔ 𝐶 = 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 = wceq 1331 |
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-5 1423 ax-gen 1425 ax-4 1487 ax-17 1506 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-cleq 2132 |
This theorem is referenced by: eqeq2i 2150 eqeq2d 2151 eqeq12 2152 eleq1 2202 neeq2 2322 alexeq 2811 ceqex 2812 pm13.183 2822 eqeu 2854 mo2icl 2863 mob2 2864 euind 2871 reu6i 2875 reuind 2889 sbc5 2932 csbiebg 3042 sneq 3538 preqr1g 3693 preqr1 3695 prel12 3698 preq12bg 3700 opth 4159 euotd 4176 ordtriexmid 4437 wetriext 4491 tfisi 4501 ideqg 4690 resieq 4829 cnveqb 4994 cnveq0 4995 iota5 5108 funopg 5157 fneq2 5212 foeq3 5343 tz6.12f 5450 funbrfv 5460 fnbrfvb 5462 fvelimab 5477 elrnrexdm 5559 eufnfv 5648 f1veqaeq 5670 mpoeq123 5830 ovmpt4g 5893 ovi3 5907 ovg 5909 caovcang 5932 caovcan 5935 frecabcl 6296 nntri3or 6389 dcdifsnid 6400 nnaordex 6423 nnawordex 6424 ereq2 6437 eroveu 6520 2dom 6699 fundmen 6700 xpf1o 6738 nneneq 6751 tridc 6793 fisseneq 6820 fidcenumlemrks 6841 supsnti 6892 isotilem 6893 updjud 6967 nqtri3or 7204 ltexnqq 7216 aptisr 7587 srpospr 7591 map2psrprg 7613 axpre-apti 7693 nntopi 7702 subval 7954 eqord1 8245 divvalap 8434 nn0ind-raph 9168 frecuzrdgtcl 10185 frecuzrdgfunlem 10192 sqrtrval 10772 summodclem2 11151 prodmodclem2 11346 divides 11495 dvdstr 11530 odd2np1lem 11569 ndvdssub 11627 eucalglt 11738 hashgcdeq 11904 ennnfonelemim 11937 xmeteq0 12528 trilpo 13236 |
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