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Mirrors > Home > MPE Home > Th. List > f1eq2 | Structured version Visualization version GIF version |
Description: Equality theorem for one-to-one functions. (Contributed by NM, 10-Feb-1997.) |
Ref | Expression |
---|---|
f1eq2 | ⊢ (𝐴 = 𝐵 → (𝐹:𝐴–1-1→𝐶 ↔ 𝐹:𝐵–1-1→𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | feq2 6027 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐹:𝐴⟶𝐶 ↔ 𝐹:𝐵⟶𝐶)) | |
2 | 1 | anbi1d 741 | . 2 ⊢ (𝐴 = 𝐵 → ((𝐹:𝐴⟶𝐶 ∧ Fun ◡𝐹) ↔ (𝐹:𝐵⟶𝐶 ∧ Fun ◡𝐹))) |
3 | df-f1 5893 | . 2 ⊢ (𝐹:𝐴–1-1→𝐶 ↔ (𝐹:𝐴⟶𝐶 ∧ Fun ◡𝐹)) | |
4 | df-f1 5893 | . 2 ⊢ (𝐹:𝐵–1-1→𝐶 ↔ (𝐹:𝐵⟶𝐶 ∧ Fun ◡𝐹)) | |
5 | 2, 3, 4 | 3bitr4g 303 | 1 ⊢ (𝐴 = 𝐵 → (𝐹:𝐴–1-1→𝐶 ↔ 𝐹:𝐵–1-1→𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∧ wa 384 = wceq 1483 ◡ccnv 5113 Fun wfun 5882 ⟶wf 5884 –1-1→wf1 5885 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 df-cleq 2615 df-fn 5891 df-f 5892 df-f1 5893 |
This theorem is referenced by: f1oeq2 6128 f1eq123d 6131 f10d 6170 brdomg 7965 marypha1lem 8339 fseqenlem1 8847 dfac12lem2 8966 dfac12lem3 8967 ackbij2 9065 iundom2g 9362 hashf1 13241 istrkg3ld 25360 ausgrusgrb 26060 usgr0 26135 uspgr1e 26136 usgrres 26200 usgrexilem 26336 usgr2pthlem 26659 usgr2pth 26660 matunitlindflem2 33406 eldioph2lem2 37324 fargshiftf1 41377 aacllem 42547 |
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