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Theorem fnniniseg2 5806
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 5804 . 2 (𝐹 Fn 𝐴 → (𝐹 “ (V ∖ {𝐵})) = {𝑥𝐴 ∣ (𝐹𝑥) ∈ (V ∖ {𝐵})})
2 eldifsn 3825 . . . 4 ((𝐹𝑥) ∈ (V ∖ {𝐵}) ↔ ((𝐹𝑥) ∈ V ∧ (𝐹𝑥) ≠ 𝐵))
3 funfvex 5692 . . . . . 6 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (𝐹𝑥) ∈ V)
43funfni 5463 . . . . 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 2803 . 2 (𝐹 Fn 𝐴 → {𝑥𝐴 ∣ (𝐹𝑥) ∈ (V ∖ {𝐵})} = {𝑥𝐴 ∣ (𝐹𝑥) ≠ 𝐵})
81, 7eqtrd 2267 1 (𝐹 Fn 𝐴 → (𝐹 “ (V ∖ {𝐵})) = {𝑥𝐴 ∣ (𝐹𝑥) ≠ 𝐵})
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1398  wcel 2205  wne 2414  {crab 2526  Vcvv 2815  cdif 3211  {csn 3694  ccnv 4753  cima 4757   Fn wfn 5352  cfv 5357
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-fv 5365
This theorem is referenced by: (None)
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