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Theorem funoprab 6188
Description: "At most one" is a sufficient condition for an operation class abstraction to be a function. (Contributed by NM, 17-Mar-1995.)
Hypothesis
Ref Expression
funoprab.1  |-  E* z ph
Assertion
Ref Expression
funoprab  |-  Fun  { <. <. x ,  y
>. ,  z >.  | 
ph }
Distinct variable group:    x, y, z
Allowed substitution hints:    ph( x,  y,  z)

Proof of Theorem funoprab
StepHypRef Expression
1 funoprab.1 . . 3  |-  E* z ph
21gen2 1503 . 2  |-  A. x A. y E* z ph
3 funoprabg 6187 . 2  |-  ( A. x A. y E* z ph  ->  Fun  { <. <. x ,  y >. ,  z
>.  |  ph } )
42, 3ax-mp 5 1  |-  Fun  { <. <. x ,  y
>. ,  z >.  | 
ph }
Colors of variables:    wff set class
This proof depends on syntax axioms:   A.wal 1400   E*wmo 2087   Fun wfun 5371   {coprab 6086
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  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 4249  ax-pow 4311  ax-pr 4346
This proof 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-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-br 4131  df-opab 4193  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-fun 5379  df-oprab 6089
This theorem is used by:  mpofun  6190  ovidig  6206  ovigg  6209  oprabex  6361  th3qcor  6913  axaddf  8235  axmulf  8236
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