Theorem tfrlemisucfn 6585

Description: We can extend an acceptable function by one element to produce a function. Lemma for tfrlemi1 6593. (Contributed by Jim Kingdon, 2-Jul-2019.)

Hypotheses

Ref	Expression
tfrlemisucfn.1	|- A = { f | E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) }
tfrlemisucfn.2	|- ( ph -> A. x ( Fun F /\ ( F ` x ) e. _V ) )
tfrlemisucfn.3	|- ( ph -> z e. On )
tfrlemisucfn.4	|- ( ph -> g Fn z )
tfrlemisucfn.5	|- ( ph -> g e. A )

Assertion

Ref	Expression
tfrlemisucfn	|- ( ph -> ( g u. { <. z , ( F ` g ) >. } ) Fn suc z )

Distinct variable groups:   f, g, x, y, z, A   f, F, g, x, y, z   ph, y

Allowed substitution hints:   ph( x, z, f, g)

Proof of Theorem tfrlemisucfn

Step	Hyp	Ref	Expression
1		vex 2824	. . 3 |- z e. _V
2	1	a1i 9	. 2 |- ( ph -> z e. _V )
3		tfrlemisucfn.2	. . . 4 |- ( ph -> A. x ( Fun F /\ ( F ` x ) e. _V ) )
4	3	tfrlem3-2d 6573	. . 3 |- ( ph -> ( Fun F /\ ( F ` g ) e. _V ) )
5	4	simprd 114	. 2 |- ( ph -> ( F ` g ) e. _V )
6		tfrlemisucfn.4	. 2 |- ( ph -> g Fn z )
7		eqid 2238	. 2 |- ( g u. { <. z , ( F ` g ) >. } ) = ( g u. { <. z , ( F ` g ) >. } )
8		df-suc 4511	. 2 |- suc z = ( z u. { z } )
9		elirrv 4690	. . 3 |- -. z e. z
10	9	a1i 9	. 2 |- ( ph -> -. z e. z )
11	2, 5, 6, 7, 8, 10	fnunsn 5485	1 |- ( ph -> ( g u. { <. z , ( F ` g ) >. } ) Fn suc z )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   A.wal 1400   = wceq 1402   e. wcel 2209   {cab 2224   A.wral 2528   E.wrex 2529   _Vcvv 2821   u. cun 3218   {csn 3705   <.cop 3708   Oncon0 4503   suc csuc 4505   |` cres 4771   Fun wfun 5366   Fn wfn 5367   ` 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-in1 623  ax-in2 624  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-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-setind 4679

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-suc 4511  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-iota 5332  df-fun 5374  df-fn 5375  df-fv 5380

This theorem is referenced by:  tfrlemisucaccv  6586  tfrlemibfn  6589