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Theorem funmpt 5392
Description: A function in maps-to notation is a function. (Contributed by Mario Carneiro, 13-Jan-2013.)
Assertion
Ref Expression
funmpt Fun (𝑥𝐴𝐵)

Proof of Theorem funmpt
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 funopab4 5391 . 2 Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
2 df-mpt 4175 . . 3 (𝑥𝐴𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
32funeqi 5375 . 2 (Fun (𝑥𝐴𝐵) ↔ Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)})
41, 3mpbir 146 1 Fun (𝑥𝐴𝐵)
Colors of variables: wff set class
Syntax hints:  wa 104   = wceq 1398  wcel 2205  {copab 4172  cmpt 4173  Fun wfun 5348
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-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 4230  ax-pow 4289  ax-pr 4324
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-ral 2527  df-rex 2528  df-v 2817  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-fun 5356
This theorem is referenced by:  funmpt2  5393  fmptco  5845  resfunexg  5907  mptexg  5913  mptexw  6308  brtpos2  6484  tposfun  6493  rdgtfr  6607  rdgruledefgg  6608  rdgon  6619  freccllem  6635  frecfcllem  6637  hashinfom  11149  hashennn  11151  ccatalpha  11309  negfi  11921  tgrest  15083  dvrecap  15627  funmptd  16624
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