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Mirrors > Home > MPE Home > Th. List > feq3 | Structured version Visualization version GIF version |
Description: Equality theorem for functions. (Contributed by NM, 1-Aug-1994.) |
Ref | Expression |
---|---|
feq3 | ⊢ (𝐴 = 𝐵 → (𝐹:𝐶⟶𝐴 ↔ 𝐹:𝐶⟶𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq2 3590 | . . 3 ⊢ (𝐴 = 𝐵 → (ran 𝐹 ⊆ 𝐴 ↔ ran 𝐹 ⊆ 𝐵)) | |
2 | 1 | anbi2d 736 | . 2 ⊢ (𝐴 = 𝐵 → ((𝐹 Fn 𝐶 ∧ ran 𝐹 ⊆ 𝐴) ↔ (𝐹 Fn 𝐶 ∧ ran 𝐹 ⊆ 𝐵))) |
3 | df-f 5808 | . 2 ⊢ (𝐹:𝐶⟶𝐴 ↔ (𝐹 Fn 𝐶 ∧ ran 𝐹 ⊆ 𝐴)) | |
4 | df-f 5808 | . 2 ⊢ (𝐹:𝐶⟶𝐵 ↔ (𝐹 Fn 𝐶 ∧ ran 𝐹 ⊆ 𝐵)) | |
5 | 2, 3, 4 | 3bitr4g 302 | 1 ⊢ (𝐴 = 𝐵 → (𝐹:𝐶⟶𝐴 ↔ 𝐹:𝐶⟶𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 = wceq 1475 ⊆ wss 3540 ran crn 5039 Fn wfn 5799 ⟶wf 5800 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-in 3547 df-ss 3554 df-f 5808 |
This theorem is referenced by: feq23 5942 feq3d 5945 fun2 5980 fconstg 6005 f1eq3 6011 mapvalg 7754 mapsn 7785 cantnff 8454 axdc4uz 12645 supcvg 14427 lmff 20915 txcn 21239 lmmbr 22864 iscmet3 22899 dvcnvrelem2 23585 itgsubstlem 23615 umgrislfupgr 25789 isumgra 25844 wlks 26047 wlkcompim 26054 wlkelwrd 26058 iseupa 26492 isgrpo 26735 vciOLD 26800 isvclem 26816 nmop0h 28234 sitgaddlemb 29737 sitmcl 29740 cvmliftlem15 30534 mtyf 30703 matunitlindflem1 32575 sdclem1 32709 k0004lem1 37465 mapsnd 38383 stoweidlem57 38950 usgrislfuspgr 40414 1wlkv0 40859 |
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