MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  moanmo Unicode version

Theorem moanmo 2216
Description: Nested "at most one" quantifiers. (Contributed by NM, 25-Jan-2006.)
Assertion
Ref Expression
moanmo  |-  E* x
( ph  /\  E* x ph )

Proof of Theorem moanmo
StepHypRef Expression
1 id 19 . . 3  |-  ( E* x ph  ->  E* x ph )
2 nfmo1 2167 . . . 4  |-  F/ x E* x ph
32moanim 2212 . . 3  |-  ( E* x ( E* x ph  /\  ph )  <->  ( E* x ph  ->  E* x ph ) )
41, 3mpbir 200 . 2  |-  E* x
( E* x ph  /\ 
ph )
5 ancom 437 . . 3  |-  ( (
ph  /\  E* x ph )  <->  ( E* x ph  /\  ph ) )
65mobii 2192 . 2  |-  ( E* x ( ph  /\  E* x ph )  <->  E* x
( E* x ph  /\ 
ph ) )
74, 6mpbir 200 1  |-  E* x
( ph  /\  E* x ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358   E*wmo 2157
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161
  Copyright terms: Public domain W3C validator