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| Mirrors > Home > MPE Home > Th. List > Mathboxes > fvmpt4d | Structured version Visualization version GIF version | ||
| Description: Value of a function given by the maps-to notation. (Contributed by Glauco Siliprandi, 15-Feb-2025.) |
| Ref | Expression |
|---|---|
| fvmpt4d.1 | ⊢ Ⅎ𝑥𝐴 |
| fvmpt4d.2 | ⊢ (𝜑 → 𝐵 ∈ 𝐶) |
| fvmpt4d.3 | ⊢ (𝜑 → 𝑥 ∈ 𝐴) |
| Ref | Expression |
|---|---|
| fvmpt4d | ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ 𝐵)‘𝑥) = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fvmpt4d.3 | . 2 ⊢ (𝜑 → 𝑥 ∈ 𝐴) | |
| 2 | fvmpt4d.2 | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝐶) | |
| 3 | fvmpt4d.1 | . . 3 ⊢ Ⅎ𝑥𝐴 | |
| 4 | 3 | fvmpt2f 6982 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐵 ∈ 𝐶) → ((𝑥 ∈ 𝐴 ↦ 𝐵)‘𝑥) = 𝐵) |
| 5 | 1, 2, 4 | syl2anc 596 | 1 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ 𝐵)‘𝑥) = 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 Ⅎwnfc 2907 ↦ cmpt 5185 ‘cfv 6527 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5248 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5542 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-iota 6483 df-fun 6529 df-fv 6535 |
| This theorem is used by: (None) |
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