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Theorem ax11o 1934
Description: Derivation of set.mm's original ax-11o 2080 from ax-10 2079 and the shorter ax-11 1715 that has replaced it.

An open problem is whether this theorem can be proved without relying on ax-16 2083 or ax-17 1603 (given all of the original and new versions of sp 1716 through ax-15 2082).

Another open problem is whether this theorem can be proved without relying on ax12o 1875.

Theorem ax11 2094 shows the reverse derivation of ax-11 1715 from ax-11o 2080.

Normally, ax11o 1934 should be used rather than ax-11o 2080, except by theorems specifically studying the latter's properties. (Contributed by NM, 3-Feb-2007.)

Assertion
Ref Expression
ax11o  |-  ( -. 
A. x  x  =  y  ->  ( x  =  y  ->  ( ph  ->  A. x ( x  =  y  ->  ph )
) ) )

Proof of Theorem ax11o
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 ax-11 1715 . 2  |-  ( x  =  z  ->  ( A. z ph  ->  A. x
( x  =  z  ->  ph ) ) )
21ax11a2 1933 1  |-  ( -. 
A. x  x  =  y  ->  ( x  =  y  ->  ( ph  ->  A. x ( x  =  y  ->  ph )
) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4   A.wal 1527
This theorem is referenced by:  ax11b  1935  equs5  1936  ax11v  2036  a12study  29132  a12studyALT  29133  a12study3  29135
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866
This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1529  df-nf 1532
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