Theorem mosubop 4792

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 1498	. 2 |- A. y A. z E* x ph
3		mosubopt 4791	. 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 1395   = wceq 1397   E.wex 1540   E*wmo 2080   <.cop 3672

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678

This theorem is referenced by:  ovi3  6158  ov6g  6159  oprabex3  6290  axaddf  8087  axmulf  8088