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Theorem funmpt 5314
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 5313 . 2 Fun {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
2 df-mpt 4111 . . 3 (𝑥𝐴𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
32funeqi 5297 . 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 1373  wcel 2177  {copab 4108  cmpt 4109  Fun wfun 5270
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2180  ax-ext 2188  ax-sep 4166  ax-pow 4222  ax-pr 4257
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ral 2490  df-rex 2491  df-v 2775  df-un 3171  df-in 3173  df-ss 3180  df-pw 3619  df-sn 3640  df-pr 3641  df-op 3643  df-br 4048  df-opab 4110  df-mpt 4111  df-id 4344  df-xp 4685  df-rel 4686  df-cnv 4687  df-co 4688  df-fun 5278
This theorem is referenced by:  funmpt2  5315  fmptco  5753  resfunexg  5812  mptexg  5816  mptexw  6205  brtpos2  6344  tposfun  6353  rdgtfr  6467  rdgruledefgg  6468  rdgon  6479  freccllem  6495  frecfcllem  6497  hashinfom  10930  hashennn  10932  negfi  11583  tgrest  14685  dvrecap  15229  funmptd  15813
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