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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 5638 | . 2 ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (V ∖ {𝐵})) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (V ∖ {𝐵})}) | |
2 | eldifsn 3720 | . . . 4 ⊢ ((𝐹‘𝑥) ∈ (V ∖ {𝐵}) ↔ ((𝐹‘𝑥) ∈ V ∧ (𝐹‘𝑥) ≠ 𝐵)) | |
3 | funfvex 5533 | . . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝑥 ∈ dom 𝐹) → (𝐹‘𝑥) ∈ V) | |
4 | 3 | funfni 5317 | . . . . 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 2726 | . 2 ⊢ (𝐹 Fn 𝐴 → {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (V ∖ {𝐵})} = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≠ 𝐵}) |
8 | 1, 7 | eqtrd 2210 | 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 1353 ∈ wcel 2148 ≠ wne 2347 {crab 2459 Vcvv 2738 ∖ cdif 3127 {csn 3593 ◡ccnv 4626 “ cima 4630 Fn wfn 5212 ‘cfv 5217 |
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 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-14 2151 ax-ext 2159 ax-sep 4122 ax-pow 4175 ax-pr 4210 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-ral 2460 df-rex 2461 df-rab 2464 df-v 2740 df-sbc 2964 df-dif 3132 df-un 3134 df-in 3136 df-ss 3143 df-pw 3578 df-sn 3599 df-pr 3600 df-op 3602 df-uni 3811 df-br 4005 df-opab 4066 df-id 4294 df-xp 4633 df-rel 4634 df-cnv 4635 df-co 4636 df-dm 4637 df-rn 4638 df-res 4639 df-ima 4640 df-iota 5179 df-fun 5219 df-fn 5220 df-fv 5225 |
This theorem is referenced by: (None) |
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