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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
StepHypRef Expression
1 pm5.4 362 . 2
2 df-mo 2287 . . 3
32imbi2i 312 . 2
41, 3, 23bitr4ri 278 1
Colors of variables: wff setvar class
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
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