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| Mirrors > Home > ILE Home > Th. List > feq3d | GIF version | ||
| Description: Equality deduction for functions. (Contributed by AV, 1-Jan-2020.) |
| Ref | Expression |
|---|---|
| feq2d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| Ref | Expression |
|---|---|
| feq3d | ⊢ (𝜑 → (𝐹:𝑋⟶𝐴 ↔ 𝐹:𝑋⟶𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | feq2d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | feq3 5518 | . 2 ⊢ (𝐴 = 𝐵 → (𝐹:𝑋⟶𝐴 ↔ 𝐹:𝑋⟶𝐵)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐹:𝑋⟶𝐴 ↔ 𝐹:𝑋⟶𝐵)) |
| 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-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 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-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 df-f 5381 |
| This theorem is used by: gzsumress 13763 resmhm2b 13847 isghm 14097 gsumvalfi 14203 gsumressfi 14218 uptx 15427 txcn 15428 dvply2g 15919 lgseisenlem3 16313 lgseisenlem4 16314 uhgr0vb 16447 uhgrun 16449 upgrun 16489 umgrun 16491 wksfval 16685 wlkres 16742 |
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