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Theorem nfop 3716
Description: Bound-variable hypothesis builder for ordered pairs. (Contributed by NM, 14-Nov-1995.)
Hypotheses
Ref Expression
nfop.1  |-  F/_ x A
nfop.2  |-  F/_ x B
Assertion
Ref Expression
nfop  |-  F/_ x <. A ,  B >.

Proof of Theorem nfop
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 df-op 3531 . 2  |-  <. A ,  B >.  =  { y  |  ( A  e. 
_V  /\  B  e.  _V  /\  y  e.  { { A } ,  { A ,  B } } ) }
2 nfop.1 . . . . 5  |-  F/_ x A
32nfel1 2290 . . . 4  |-  F/ x  A  e.  _V
4 nfop.2 . . . . 5  |-  F/_ x B
54nfel1 2290 . . . 4  |-  F/ x  B  e.  _V
62nfsn 3578 . . . . . 6  |-  F/_ x { A }
72, 4nfpr 3568 . . . . . 6  |-  F/_ x { A ,  B }
86, 7nfpr 3568 . . . . 5  |-  F/_ x { { A } ,  { A ,  B } }
98nfcri 2273 . . . 4  |-  F/ x  y  e.  { { A } ,  { A ,  B } }
103, 5, 9nf3an 1545 . . 3  |-  F/ x
( A  e.  _V  /\  B  e.  _V  /\  y  e.  { { A } ,  { A ,  B } } )
1110nfab 2284 . 2  |-  F/_ x { y  |  ( A  e.  _V  /\  B  e.  _V  /\  y  e.  { { A } ,  { A ,  B } } ) }
121, 11nfcxfr 2276 1  |-  F/_ x <. A ,  B >.
Colors of variables: wff set class
Syntax hints:    /\ w3a 962    e. wcel 1480   {cab 2123   F/_wnfc 2266   _Vcvv 2681   {csn 3522   {cpr 3523   <.cop 3525
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-v 2683  df-un 3070  df-sn 3528  df-pr 3529  df-op 3531
This theorem is referenced by:  nfopd  3717  moop2  4168  fliftfuns  5692  dfmpo  6113  qliftfuns  6506  xpf1o  6731  caucvgprprlemaddq  7509  nfseq  10221  txcnp  12429  cnmpt1t  12443  cnmpt2t  12451
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