Theorem tfrlemisucfn 6533

Description: We can extend an acceptable function by one element to produce a function. Lemma for tfrlemi1 6541. (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 2806	. . 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 6521	. . 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 2231	. 2 |- ( g u. { <. z , ( F ` g ) >. } ) = ( g u. { <. z , ( F ` g ) >. } )
8		df-suc 4474	. 2 |- suc z = ( z u. { z } )
9		elirrv 4652	. . 3 |- -. z e. z
10	9	a1i 9	. 2 |- ( ph -> -. z e. z )
11	2, 5, 6, 7, 8, 10	fnunsn 5446	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 2202   {cab 2217   A.wral 2511   E.wrex 2512   _Vcvv 2803   u. cun 3199   {csn 3673   <.cop 3676   Oncon0 4466   suc csuc 4468   |` cres 4733   Fun wfun 5327   Fn wfn 5328   ` cfv 5333

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 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-setind 4641

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-ral 2516  df-rex 2517  df-v 2805  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-opab 4156  df-id 4396  df-suc 4474  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-iota 5293  df-fun 5335  df-fn 5336  df-fv 5341

This theorem is referenced by:  tfrlemisucaccv  6534  tfrlemibfn  6537