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Theorem fnniniseg2 5823
Description: Support sets of functions expressed as abstractions. (Contributed by Stefan O'Rear, 1-Feb-2015.)
Assertion
Ref Expression
fnniniseg2 (𝐹 Fn 𝐴 → (𝐹 “ (V ∖ {𝐵})) = {𝑥𝐴 ∣ (𝐹𝑥) ≠ 𝐵})
Distinct variable groups:   𝑥,𝐴   𝑥,𝐹   𝑥,𝐵

Proof of Theorem fnniniseg2
StepHypRef Expression
1 fncnvima2 5821 . 2 (𝐹 Fn 𝐴 → (𝐹 “ (V ∖ {𝐵})) = {𝑥𝐴 ∣ (𝐹𝑥) ∈ (V ∖ {𝐵})})
2 eldifsn 3836 . . . 4 ((𝐹𝑥) ∈ (V ∖ {𝐵}) ↔ ((𝐹𝑥) ∈ V ∧ (𝐹𝑥) ≠ 𝐵))
3 funfvex 5707 . . . . . 6 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (𝐹𝑥) ∈ V)
43funfni 5478 . . . . 5 ((𝐹 Fn 𝐴𝑥𝐴) → (𝐹𝑥) ∈ V)
54biantrurd 305 . . . 4 ((𝐹 Fn 𝐴𝑥𝐴) → ((𝐹𝑥) ≠ 𝐵 ↔ ((𝐹𝑥) ∈ V ∧ (𝐹𝑥) ≠ 𝐵)))
62, 5bitr4id 199 . . 3 ((𝐹 Fn 𝐴𝑥𝐴) → ((𝐹𝑥) ∈ (V ∖ {𝐵}) ↔ (𝐹𝑥) ≠ 𝐵))
76rabbidva 2809 . 2 (𝐹 Fn 𝐴 → {𝑥𝐴 ∣ (𝐹𝑥) ∈ (V ∖ {𝐵})} = {𝑥𝐴 ∣ (𝐹𝑥) ≠ 𝐵})
81, 7eqtrd 2271 1 (𝐹 Fn 𝐴 → (𝐹 “ (V ∖ {𝐵})) = {𝑥𝐴 ∣ (𝐹𝑥) ≠ 𝐵})
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1402  wcel 2209  wne 2420  {crab 2532  Vcvv 2821  cdif 3217  {csn 3705  ccnv 4768  cima 4772   Fn wfn 5367  cfv 5372
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-fv 5380
This theorem is referenced by: (None)
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