Theorem moabs 2315

Description: Absorption of existence condition by "at most one." (Contributed by NM, 4-Nov-2002.)

Assertion

Ref	Expression
moabs

Proof of Theorem moabs

Step	Hyp	Ref	Expression
1		pm5.4 362	. 2
2		df-mo 2287	. . 3
3	2	imbi2i 312	. 2
4	1, 3, 2	3bitr4ri 278	1

Syntax hints:  ->wi 4  <->wb 184  E.wex 1612  E!weu 2282  E*wmo 2283

This theorem is referenced by:  mo3  2323  mo3OLD  2324  dffun7  5619  wl-mo3t  30021

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 185  df-mo 2287