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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 5549 | . 2 ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (V ∖ {𝐵})) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (V ∖ {𝐵})}) | |
2 | eldifsn 3658 | . . . 4 ⊢ ((𝐹‘𝑥) ∈ (V ∖ {𝐵}) ↔ ((𝐹‘𝑥) ∈ V ∧ (𝐹‘𝑥) ≠ 𝐵)) | |
3 | funfvex 5446 | . . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝑥 ∈ dom 𝐹) → (𝐹‘𝑥) ∈ V) | |
4 | 3 | funfni 5231 | . . . . 5 ⊢ ((𝐹 Fn 𝐴 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ V) |
5 | 4 | biantrurd 303 | . . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ≠ 𝐵 ↔ ((𝐹‘𝑥) ∈ V ∧ (𝐹‘𝑥) ≠ 𝐵))) |
6 | 2, 5 | bitr4id 198 | . . 3 ⊢ ((𝐹 Fn 𝐴 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (V ∖ {𝐵}) ↔ (𝐹‘𝑥) ≠ 𝐵)) |
7 | 6 | rabbidva 2677 | . 2 ⊢ (𝐹 Fn 𝐴 → {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (V ∖ {𝐵})} = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≠ 𝐵}) |
8 | 1, 7 | eqtrd 2173 | 1 ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (V ∖ {𝐵})) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≠ 𝐵}) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1332 ∈ wcel 1481 ≠ wne 2309 {crab 2421 Vcvv 2689 ∖ cdif 3073 {csn 3532 ◡ccnv 4546 “ cima 4550 Fn wfn 5126 ‘cfv 5131 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-ral 2422 df-rex 2423 df-rab 2426 df-v 2691 df-sbc 2914 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-br 3938 df-opab 3998 df-id 4223 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-res 4559 df-ima 4560 df-iota 5096 df-fun 5133 df-fn 5134 df-fv 5139 |
This theorem is referenced by: (None) |
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