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| Mirrors > Home > ILE Home > Th. List > fnniniseg2 | GIF version | ||
| Description: Support sets of functions expressed as abstractions. (Contributed by Stefan O'Rear, 1-Feb-2015.) |
| Ref | Expression |
|---|---|
| fnniniseg2 | ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (V ∖ {𝐵})) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≠ 𝐵}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fncnvima2 5719 | . 2 ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (V ∖ {𝐵})) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (V ∖ {𝐵})}) | |
| 2 | eldifsn 3766 | . . . 4 ⊢ ((𝐹‘𝑥) ∈ (V ∖ {𝐵}) ↔ ((𝐹‘𝑥) ∈ V ∧ (𝐹‘𝑥) ≠ 𝐵)) | |
| 3 | funfvex 5611 | . . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝑥 ∈ dom 𝐹) → (𝐹‘𝑥) ∈ V) | |
| 4 | 3 | funfni 5390 | . . . . 5 ⊢ ((𝐹 Fn 𝐴 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ V) |
| 5 | 4 | biantrurd 305 | . . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ≠ 𝐵 ↔ ((𝐹‘𝑥) ∈ V ∧ (𝐹‘𝑥) ≠ 𝐵))) |
| 6 | 2, 5 | bitr4id 199 | . . 3 ⊢ ((𝐹 Fn 𝐴 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (V ∖ {𝐵}) ↔ (𝐹‘𝑥) ≠ 𝐵)) |
| 7 | 6 | rabbidva 2761 | . 2 ⊢ (𝐹 Fn 𝐴 → {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (V ∖ {𝐵})} = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≠ 𝐵}) |
| 8 | 1, 7 | eqtrd 2239 | 1 ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (V ∖ {𝐵})) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≠ 𝐵}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1373 ∈ wcel 2177 ≠ wne 2377 {crab 2489 Vcvv 2773 ∖ cdif 3167 {csn 3638 ◡ccnv 4687 “ cima 4691 Fn wfn 5280 ‘cfv 5285 |
| 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-in1 615 ax-in2 616 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 4173 ax-pow 4229 ax-pr 4264 |
| 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-ne 2378 df-ral 2490 df-rex 2491 df-rab 2494 df-v 2775 df-sbc 3003 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-pw 3623 df-sn 3644 df-pr 3645 df-op 3647 df-uni 3860 df-br 4055 df-opab 4117 df-id 4353 df-xp 4694 df-rel 4695 df-cnv 4696 df-co 4697 df-dm 4698 df-rn 4699 df-res 4700 df-ima 4701 df-iota 5246 df-fun 5287 df-fn 5288 df-fv 5293 |
| This theorem is referenced by: (None) |
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