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| Mirrors > Home > ILE Home > Th. List > f1fveq | GIF version | ||
| Description: Equality of function values for a one-to-one function. (Contributed by NM, 11-Feb-1997.) |
| Ref | Expression |
|---|---|
| f1fveq | ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ (𝐶 ∈ 𝐴 ∧ 𝐷 ∈ 𝐴)) → ((𝐹‘𝐶) = (𝐹‘𝐷) ↔ 𝐶 = 𝐷)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f1veqaeq 5837 | . 2 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ (𝐶 ∈ 𝐴 ∧ 𝐷 ∈ 𝐴)) → ((𝐹‘𝐶) = (𝐹‘𝐷) → 𝐶 = 𝐷)) | |
| 2 | fveq2 5575 | . 2 ⊢ (𝐶 = 𝐷 → (𝐹‘𝐶) = (𝐹‘𝐷)) | |
| 3 | 1, 2 | impbid1 142 | 1 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ (𝐶 ∈ 𝐴 ∧ 𝐷 ∈ 𝐴)) → ((𝐹‘𝐶) = (𝐹‘𝐷) ↔ 𝐶 = 𝐷)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1372 ∈ wcel 2175 –1-1→wf1 5267 ‘cfv 5270 |
| 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 710 ax-5 1469 ax-7 1470 ax-gen 1471 ax-ie1 1515 ax-ie2 1516 ax-8 1526 ax-10 1527 ax-11 1528 ax-i12 1529 ax-bndl 1531 ax-4 1532 ax-17 1548 ax-i9 1552 ax-ial 1556 ax-i5r 1557 ax-14 2178 ax-ext 2186 ax-sep 4161 ax-pow 4217 ax-pr 4252 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1375 df-nf 1483 df-sb 1785 df-eu 2056 df-mo 2057 df-clab 2191 df-cleq 2197 df-clel 2200 df-nfc 2336 df-ral 2488 df-rex 2489 df-v 2773 df-sbc 2998 df-un 3169 df-in 3171 df-ss 3178 df-pw 3617 df-sn 3638 df-pr 3639 df-op 3641 df-uni 3850 df-br 4044 df-opab 4105 df-id 4339 df-xp 4680 df-rel 4681 df-cnv 4682 df-co 4683 df-dm 4684 df-iota 5231 df-fun 5272 df-fn 5273 df-f 5274 df-f1 5275 df-fv 5278 |
| This theorem is referenced by: f1elima 5841 cocan1 5855 f1oiso 5894 2dom 6896 xpdom2 6925 en2eqpr 7003 isotilem 7107 frec2uzled 10572 seqf1oglem1 10662 hashen 10927 eulerthlemh 12495 f1ocpbllem 13084 f1ovscpbl 13086 relogef 15278 iswomninnlem 15921 |
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