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Theorem exmo 2333
Description: Something exists or at most one exists. (Contributed by NM, 8-Mar-1995.)
Assertion
Ref Expression
exmo

Proof of Theorem exmo
StepHypRef Expression
1 pm2.21 103 . . 3
2 df-mo 2318 . . 3
31, 2sylibr 205 . 2
43orri 367 1
Colors of variables: wff set class
Syntax hints:  -.wn 3  ->wi 4  \/wo 359  E.wex 1565  E!weu 2313  E*wmo 2314
This theorem is referenced by:  exmoeu  2336  moanim  2383  moexex  2401  moexexOLD  2402  mo2icl  3176  mosubopt  4611  dff3  5872  brdom3  8577  mof  27499
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 179  df-or 361  df-mo 2318
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