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Mirrors > Home > MPE Home > Th. List > feq2 | Structured version Visualization version GIF version |
Description: Equality theorem for functions. (Contributed by NM, 1-Aug-1994.) |
Ref | Expression |
---|---|
feq2 | ⊢ (𝐴 = 𝐵 → (𝐹:𝐴⟶𝐶 ↔ 𝐹:𝐵⟶𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fneq2 6445 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐹 Fn 𝐴 ↔ 𝐹 Fn 𝐵)) | |
2 | 1 | anbi1d 631 | . 2 ⊢ (𝐴 = 𝐵 → ((𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐶) ↔ (𝐹 Fn 𝐵 ∧ ran 𝐹 ⊆ 𝐶))) |
3 | df-f 6359 | . 2 ⊢ (𝐹:𝐴⟶𝐶 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐶)) | |
4 | df-f 6359 | . 2 ⊢ (𝐹:𝐵⟶𝐶 ↔ (𝐹 Fn 𝐵 ∧ ran 𝐹 ⊆ 𝐶)) | |
5 | 2, 3, 4 | 3bitr4g 316 | 1 ⊢ (𝐴 = 𝐵 → (𝐹:𝐴⟶𝐶 ↔ 𝐹:𝐵⟶𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1537 ⊆ wss 3936 ran crn 5556 Fn wfn 6350 ⟶wf 6351 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-9 2124 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-cleq 2814 df-fn 6358 df-f 6359 |
This theorem is referenced by: feq23 6498 feq2d 6500 feq2i 6506 f00 6561 f0dom0 6563 f1eq2 6571 fressnfv 6922 mapvalg 8416 map0g 8448 ac6sfi 8762 cofsmo 9691 axcc4dom 9863 ac6sg 9910 isghm 18358 pjdm2 20855 cmpcovf 21999 ulmval 24968 measval 31457 isrnmeas 31459 poseq 33095 soseq 33096 elno2 33161 noreson 33167 bj-finsumval0 34570 mbfresfi 34953 stoweidlem62 42367 hoidmvval0b 42892 vonioo 42984 vonicc 42987 |
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