Theorem mosubop 4836

Description: "At most one" remains true inside ordered pair quantification. (Contributed by NM, 28-May-1995.)

Hypothesis

Ref	Expression
mosubop.1	|- E* x ph

Assertion

Ref	Expression
mosubop	|- E* x E. y E. z ( A = <. y , z >. /\ ph )

Distinct variable group:   x, y, z, A

Allowed substitution hints:   ph( x, y, z)

Proof of Theorem mosubop

Step	Hyp	Ref	Expression
1		mosubop.1	. . 3 |- E* x ph
2	1	gen2 1503	. 2 |- A. y A. z E* x ph
3		mosubopt 4835	. 2 |- ( A. y A. z E* x ph -> E* x E. y E. z ( A = <. y , z >. /\ ph ) )
4	2, 3	ax-mp 5	1 |- E* x E. y E. z ( A = <. y , z >. /\ ph )

Syntax hints:   /\ wa 104   A.wal 1400   = wceq 1402   E.wex 1545   E*wmo 2087   <.cop 3708

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 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 4244  ax-pow 4306  ax-pr 4341

This theorem 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-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714

This theorem is referenced by:  ovi3  6216  ov6g  6217  oprabex3  6352  axaddf  8225  axmulf  8226