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Theorem elpmi 7861
Description: A partial function is a function. (Contributed by Mario Carneiro, 15-Sep-2015.)
Assertion
Ref Expression
elpmi (𝐹 ∈ (𝐴pm 𝐵) → (𝐹:dom 𝐹𝐴 ∧ dom 𝐹𝐵))

Proof of Theorem elpmi
StepHypRef Expression
1 n0i 3912 . . . 4 (𝐹 ∈ (𝐴pm 𝐵) → ¬ (𝐴pm 𝐵) = ∅)
2 fnpm 7850 . . . . . 6 pm Fn (V × V)
3 fndm 5978 . . . . . 6 ( ↑pm Fn (V × V) → dom ↑pm = (V × V))
42, 3ax-mp 5 . . . . 5 dom ↑pm = (V × V)
54ndmov 6803 . . . 4 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴pm 𝐵) = ∅)
61, 5nsyl2 142 . . 3 (𝐹 ∈ (𝐴pm 𝐵) → (𝐴 ∈ V ∧ 𝐵 ∈ V))
7 elpm2g 7859 . . 3 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐹 ∈ (𝐴pm 𝐵) ↔ (𝐹:dom 𝐹𝐴 ∧ dom 𝐹𝐵)))
86, 7syl 17 . 2 (𝐹 ∈ (𝐴pm 𝐵) → (𝐹 ∈ (𝐴pm 𝐵) ↔ (𝐹:dom 𝐹𝐴 ∧ dom 𝐹𝐵)))
98ibi 256 1 (𝐹 ∈ (𝐴pm 𝐵) → (𝐹:dom 𝐹𝐴 ∧ dom 𝐹𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384   = wceq 1481  wcel 1988  Vcvv 3195  wss 3567  c0 3907   × cxp 5102  dom cdm 5104   Fn wfn 5871  wf 5872  (class class class)co 6635  pm cpm 7843
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-8 1990  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-sep 4772  ax-nul 4780  ax-pow 4834  ax-pr 4897  ax-un 6934
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-mo 2473  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ne 2792  df-ral 2914  df-rex 2915  df-rab 2918  df-v 3197  df-sbc 3430  df-csb 3527  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-nul 3908  df-if 4078  df-pw 4151  df-sn 4169  df-pr 4171  df-op 4175  df-uni 4428  df-iun 4513  df-br 4645  df-opab 4704  df-mpt 4721  df-id 5014  df-xp 5110  df-rel 5111  df-cnv 5112  df-co 5113  df-dm 5114  df-rn 5115  df-res 5116  df-ima 5117  df-iota 5839  df-fun 5878  df-fn 5879  df-f 5880  df-fv 5884  df-ov 6638  df-oprab 6639  df-mpt2 6640  df-1st 7153  df-2nd 7154  df-pm 7845
This theorem is referenced by:  pmfun  7862  pmresg  7870  equivcau  23079  dvn2bss  23674  mrsubff  31383  mrsubrn  31384  elpmrn  39230  elpmi2  39234  issmflem  40699
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