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| Mirrors > Home > ILE Home > Th. List > funbrfv2b | GIF version | ||
| Description: Function value in terms of a binary relation. (Contributed by Mario Carneiro, 19-Mar-2014.) |
| Ref | Expression |
|---|---|
| funbrfv2b | ⊢ (Fun 𝐹 → (𝐴𝐹𝐵 ↔ (𝐴 ∈ dom 𝐹 ∧ (𝐹‘𝐴) = 𝐵))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | funrel 5296 | . . . 4 ⊢ (Fun 𝐹 → Rel 𝐹) | |
| 2 | releldm 4921 | . . . . 5 ⊢ ((Rel 𝐹 ∧ 𝐴𝐹𝐵) → 𝐴 ∈ dom 𝐹) | |
| 3 | 2 | ex 115 | . . . 4 ⊢ (Rel 𝐹 → (𝐴𝐹𝐵 → 𝐴 ∈ dom 𝐹)) |
| 4 | 1, 3 | syl 14 | . . 3 ⊢ (Fun 𝐹 → (𝐴𝐹𝐵 → 𝐴 ∈ dom 𝐹)) |
| 5 | 4 | pm4.71rd 394 | . 2 ⊢ (Fun 𝐹 → (𝐴𝐹𝐵 ↔ (𝐴 ∈ dom 𝐹 ∧ 𝐴𝐹𝐵))) |
| 6 | funbrfvb 5633 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → ((𝐹‘𝐴) = 𝐵 ↔ 𝐴𝐹𝐵)) | |
| 7 | 6 | pm5.32da 452 | . 2 ⊢ (Fun 𝐹 → ((𝐴 ∈ dom 𝐹 ∧ (𝐹‘𝐴) = 𝐵) ↔ (𝐴 ∈ dom 𝐹 ∧ 𝐴𝐹𝐵))) |
| 8 | 5, 7 | bitr4d 191 | 1 ⊢ (Fun 𝐹 → (𝐴𝐹𝐵 ↔ (𝐴 ∈ dom 𝐹 ∧ (𝐹‘𝐴) = 𝐵))) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1373 ∈ wcel 2177 class class class wbr 4050 dom cdm 4682 Rel wrel 4687 Fun wfun 5273 ‘cfv 5279 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2180 ax-ext 2188 ax-sep 4169 ax-pow 4225 ax-pr 4260 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-sbc 3003 df-un 3174 df-in 3176 df-ss 3183 df-pw 3622 df-sn 3643 df-pr 3644 df-op 3646 df-uni 3856 df-br 4051 df-opab 4113 df-id 4347 df-xp 4688 df-rel 4689 df-cnv 4690 df-co 4691 df-dm 4692 df-iota 5240 df-fun 5281 df-fn 5282 df-fv 5287 |
| This theorem is referenced by: brtpos2 6349 xpcomco 6935 |
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