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Theorem nrexrmo 2917
Description: Nonexistence implies restricted "at most one". (Contributed by NM, 17-Jun-2017.)
Assertion
Ref Expression
nrexrmo  |-  ( -. 
E. x  e.  A  ph 
->  E* x  e.  A ph )

Proof of Theorem nrexrmo
StepHypRef Expression
1 pm2.21 102 . 2  |-  ( -. 
E. x  e.  A  ph 
->  ( E. x  e.  A  ph  ->  E! x  e.  A  ph )
)
2 rmo5 2916 . 2  |-  ( E* x  e.  A ph  <->  ( E. x  e.  A  ph 
->  E! x  e.  A  ph ) )
31, 2sylibr 204 1  |-  ( -. 
E. x  e.  A  ph 
->  E* x  e.  A ph )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4   E.wrex 2698   E!wreu 2699   E*wrmo 2700
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 178  df-mo 2285  df-rex 2703  df-reu 2704  df-rmo 2705
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