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Theorem dvelimf 2068
Description: Version of dvelimv 2074 without any variable restrictions. (Contributed by NM, 1-Oct-2002.) (Revised by Mario Carneiro, 6-Oct-2016.) (Proof shortened by Wolf Lammen, 11-May-2018.)
Hypotheses
Ref Expression
dvelimf.1  |-  F/ x ph
dvelimf.2  |-  F/ z ps
dvelimf.3  |-  ( z  =  y  ->  ( ph 
<->  ps ) )
Assertion
Ref Expression
dvelimf  |-  ( -. 
A. x  x  =  y  ->  F/ x ps )

Proof of Theorem dvelimf
StepHypRef Expression
1 dvelimf.2 . . . 4  |-  F/ z ps
2 dvelimf.3 . . . 4  |-  ( z  =  y  ->  ( ph 
<->  ps ) )
31, 2equsal 1999 . . 3  |-  ( A. z ( z  =  y  ->  ph )  <->  ps )
43bicomi 194 . 2  |-  ( ps  <->  A. z ( z  =  y  ->  ph ) )
5 nfnae 2044 . . 3  |-  F/ z  -.  A. x  x  =  y
6 nfeqf 2009 . . . . 5  |-  ( ( -.  A. x  x  =  z  /\  -.  A. x  x  =  y )  ->  F/ x  z  =  y )
76ancoms 440 . . . 4  |-  ( ( -.  A. x  x  =  y  /\  -.  A. x  x  =  z )  ->  F/ x  z  =  y )
8 dvelimf.1 . . . . 5  |-  F/ x ph
98a1i 11 . . . 4  |-  ( ( -.  A. x  x  =  y  /\  -.  A. x  x  =  z )  ->  F/ x ph )
107, 9nfimd 1827 . . 3  |-  ( ( -.  A. x  x  =  y  /\  -.  A. x  x  =  z )  ->  F/ x
( z  =  y  ->  ph ) )
115, 10nfald2 2064 . 2  |-  ( -. 
A. x  x  =  y  ->  F/ x A. z ( z  =  y  ->  ph ) )
124, 11nfxfrd 1580 1  |-  ( -. 
A. x  x  =  y  ->  F/ x ps )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 177    /\ wa 359   A.wal 1549   F/wnf 1553
This theorem is referenced by:  dvelimdf  2070  dvelimh  2071  dvelimnf  2075
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950
This theorem depends on definitions:  df-bi 178  df-an 361  df-tru 1328  df-ex 1551  df-nf 1554
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