Theorem exmoeu2 2311

Description: Existence implies "at most one" is equivalent to uniqueness. (Contributed by NM, 5-Apr-2004.)

Assertion

Ref	Expression
exmoeu2

Proof of Theorem exmoeu2

Step	Hyp	Ref	Expression
1		eu5 2310	. 2
2	1	baibr 904	1

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

This theorem is referenced by:  fneu  5690

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747

This theorem depends on definitions:  df-bi 185  df-an 371  df-ex 1613  df-eu 2286  df-mo 2287