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| Mirrors > Home > ILE Home > Th. List > feq12d | 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) |
| Ref | Expression |
|---|---|
| feq12d | ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | feq12d.1 | . . 3 ⊢ (𝜑 → 𝐹 = 𝐺) | |
| 2 | 1 | feq1d 5520 | . 2 ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐴⟶𝐶)) |
| 3 | feq12d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 4 | 3 | feq2d 5521 | . 2 ⊢ (𝜑 → (𝐺:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐶)) |
| 5 | 2, 4 | bitrd 188 | 1 ⊢ (𝜑 → (𝐹:𝐴⟶𝐶 ↔ 𝐺:𝐵⟶𝐶)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ⟶wf 5373 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-br 4131 df-opab 4193 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-fun 5379 df-fn 5380 df-f 5381 |
| This theorem is used by: feq123d 5524 smoeq 6561 lmbr2 15317 lmff 15352 limccl 15762 ellimc3apf 15763 uhgr0e 16335 incistruhgr 16343 upgr1edc 16374 umgr1een 16378 iswlk 16576 bj-charfundcALT 16847 |
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