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Theorem exmo 2270
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 2249 . . 3
31, 2sylibr 206 . 2
43orri 369 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  \/wo 361  E.wex 1581  E!weu 2244  E*wmo 2245
This theorem is referenced by:  exmoeu  2276  moanim  2316  moexex  2334  moexexOLD  2335  mo2icl  3116  mosubopt  4561  dff3  5826  brdom3  8642  mof  27959
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 363  df-mo 2249
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