Theorem tfrlemisucfn 6410

Description: We can extend an acceptable function by one element to produce a function. Lemma for tfrlemi1 6418. (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 2775	. . 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 6398	. . 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 2205	. 2 |- ( g u. { <. z , ( F ` g ) >. } ) = ( g u. { <. z , ( F ` g ) >. } )
8		df-suc 4418	. 2 |- suc z = ( z u. { z } )
9		elirrv 4596	. . 3 |- -. z e. z
10	9	a1i 9	. 2 |- ( ph -> -. z e. z )
11	2, 5, 6, 7, 8, 10	fnunsn 5383	1 |- ( ph -> ( g u. { <. z , ( F ` g ) >. } ) Fn suc z )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   A.wal 1371   = wceq 1373   e. wcel 2176   {cab 2191   A.wral 2484   E.wrex 2485   _Vcvv 2772   u. cun 3164   {csn 3633   <.cop 3636   Oncon0 4410   suc csuc 4412   |` cres 4677   Fun wfun 5265   Fn wfn 5266   ` cfv 5271

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 615  ax-in2 616  ax-io 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-14 2179  ax-ext 2187  ax-sep 4162  ax-pow 4218  ax-pr 4253  ax-setind 4585

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ne 2377  df-ral 2489  df-rex 2490  df-v 2774  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3461  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-br 4045  df-opab 4106  df-id 4340  df-suc 4418  df-xp 4681  df-rel 4682  df-cnv 4683  df-co 4684  df-dm 4685  df-iota 5232  df-fun 5273  df-fn 5274  df-fv 5279

This theorem is referenced by:  tfrlemisucaccv  6411  tfrlemibfn  6414