Theorem tz6.12 5718

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

Step	Hyp	Ref	Expression
1		df-br 4126	. 2 |- ( A F y <-> <. A , y >. e. F )
2	1	eubii 2095	. 2 |- ( E! y A F y <-> E! y <. A , y >. e. F )
3		tz6.12-1 5717	. 2 |- ( ( A F y /\ E! y A F y ) -> ( F ` A ) = y )
4	1, 2, 3	syl2anbr 292	1 |- ( ( <. A , y >. e. F /\ E! y <. A , y >. e. F ) -> ( F ` A ) = y )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1402   E!weu 2086   e. wcel 2209   <.cop 3708   class class class wbr 4125   ` cfv 5372

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This theorem depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-sn 3711  df-pr 3712  df-uni 3931  df-br 4126  df-iota 5332  df-fv 5380

This theorem is referenced by:  tz6.12f  5719