Theorem tfrlemisucfn 6568

Description: We can extend an acceptable function by one element to produce a function. Lemma for tfrlemi1 6576. (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 2818	. . 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 6556	. . 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 2234	. 2 |- ( g u. { <. z , ( F ` g ) >. } ) = ( g u. { <. z , ( F ` g ) >. } )
8		df-suc 4497	. 2 |- suc z = ( z u. { z } )
9		elirrv 4675	. . 3 |- -. z e. z
10	9	a1i 9	. 2 |- ( ph -> -. z e. z )
11	2, 5, 6, 7, 8, 10	fnunsn 5470	1 |- ( ph -> ( g u. { <. z , ( F ` g ) >. } ) Fn suc z )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   A.wal 1396   = wceq 1398   e. wcel 2205   {cab 2220   A.wral 2522   E.wrex 2523   _Vcvv 2815   u. cun 3212   {csn 3694   <.cop 3697   Oncon0 4489   suc csuc 4491   |` cres 4756   Fun wfun 5351   Fn wfn 5352   ` cfv 5357

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-setind 4664

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-v 2817  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-id 4419  df-suc 4497  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-iota 5317  df-fun 5359  df-fn 5360  df-fv 5365

This theorem is referenced by:  tfrlemisucaccv  6569  tfrlemibfn  6572