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Mirrors > Home > MPE Home > Th. List > feq123d | Structured version Visualization version GIF version |
Description: Equality deduction for functions. (Contributed by Paul Chapman, 22-Jun-2011.) |
Ref | Expression |
---|---|
feq12d.1 | ⊢ (𝜑 → 𝐹 = 𝐺) |
feq12d.2 | ⊢ (𝜑 → 𝐴 = 𝐵) |
feq123d.3 | ⊢ (𝜑 → 𝐶 = 𝐷) |
Ref | Expression |
---|---|
feq123d | ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐷)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | feq12d.1 | . . 3 ⊢ (𝜑 → 𝐹 = 𝐺) | |
2 | feq12d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
3 | 1, 2 | feq12d 6505 | . 2 ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐶)) |
4 | feq123d.3 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐷) | |
5 | 4 | feq3d 6504 | . 2 ⊢ (𝜑 → (𝐺:𝐵⟶𝐶 ↔ 𝐺:𝐵⟶𝐷)) |
6 | 3, 5 | bitrd 281 | 1 ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐷)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 = wceq 1536 ⟶wf 6354 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-rab 3150 df-v 3499 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-nul 4295 df-if 4471 df-sn 4571 df-pr 4573 df-op 4577 df-br 5070 df-opab 5132 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-fun 6360 df-fn 6361 df-f 6362 |
This theorem is referenced by: feq123 6507 feq23d 6512 fprg 6920 csbwrdg 13898 funcestrcsetclem8 17400 funcsetcestrclem8 17415 funcsetcestrclem9 17416 evlfcl 17475 yonedalem3a 17527 yonedalem4c 17530 yonedalem3b 17532 yonedainv 17534 iscau 23882 isuhgr 26848 uhgreq12g 26853 isuhgrop 26858 uhgrun 26862 isupgr 26872 upgrop 26882 isumgr 26883 upgrun 26906 umgrun 26908 lfuhgr1v0e 27039 wlkp1 27466 sseqf 31654 ismfs 32800 isrngo 35179 gneispace2 40488 funcringcsetcALTV2lem8 44321 funcringcsetclem8ALTV 44344 |
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