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Theorem tz6.12 5688
Description: Function value. Theorem 6.12(1) of [TakeutiZaring] p. 27. (Contributed by NM, 10-Jul-1994.)
Assertion
Ref Expression
tz6.12  |-  ( (
<. A ,  y >.  e.  F  /\  E! y
<. A ,  y >.  e.  F )  ->  ( F `  A )  =  y )
Distinct variable groups:    y, F    y, A

Proof of Theorem tz6.12
StepHypRef Expression
1 df-br 4154 . 2  |-  ( A F y  <->  <. A , 
y >.  e.  F )
21eubii 2247 . 2  |-  ( E! y  A F y  <-> 
E! y <. A , 
y >.  e.  F )
3 tz6.12-1 5687 . 2  |-  ( ( A F y  /\  E! y  A F
y )  ->  ( F `  A )  =  y )
41, 2, 3syl2anbr 467 1  |-  ( (
<. A ,  y >.  e.  F  /\  E! y
<. A ,  y >.  e.  F )  ->  ( F `  A )  =  y )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 359    = wceq 1649    e. wcel 1717   E!weu 2238   <.cop 3760   class class class wbr 4153   ` cfv 5394
This theorem is referenced by:  tz6.12f  5689  dfac5lem5  7941  tz6.12-afv  27706
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1661  ax-8 1682  ax-6 1736  ax-7 1741  ax-11 1753  ax-12 1939  ax-ext 2368
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2242  df-clab 2374  df-cleq 2380  df-clel 2383  df-nfc 2512  df-rex 2655  df-v 2901  df-sbc 3105  df-un 3268  df-sn 3763  df-pr 3764  df-uni 3958  df-br 4154  df-iota 5358  df-fv 5402
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