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Theorem tfrcllemsucfn 6462
Description: We can extend an acceptable function by one element to produce a function. Lemma for tfrcl 6473. (Contributed by Jim Kingdon, 24-Mar-2022.)
Hypotheses
Ref Expression
tfrcl.f  |-  F  = recs ( G )
tfrcl.g  |-  ( ph  ->  Fun  G )
tfrcl.x  |-  ( ph  ->  Ord  X )
tfrcl.ex  |-  ( (
ph  /\  x  e.  X  /\  f : x --> S )  ->  ( G `  f )  e.  S )
tfrcllemsucfn.1  |-  A  =  { f  |  E. x  e.  X  (
f : x --> S  /\  A. y  e.  x  ( f `  y )  =  ( G `  ( f  |`  y
) ) ) }
tfrcllemsucfn.3  |-  ( ph  ->  z  e.  X )
tfrcllemsucfn.4  |-  ( ph  ->  g : z --> S )
tfrcllemsucfn.5  |-  ( ph  ->  g  e.  A )
Assertion
Ref Expression
tfrcllemsucfn  |-  ( ph  ->  ( g  u.  { <. z ,  ( G `
 g ) >. } ) : suc  z
--> S )
Distinct variable groups:    f, G, x    S, f, x    f, X, x    f, g    ph, f, x    z, f, x
Allowed substitution hints:    ph( y, z, g)    A( x, y, z, f, g)    S( y, z, g)    F( x, y, z, f, g)    G( y, z, g)    X( y, z, g)

Proof of Theorem tfrcllemsucfn
StepHypRef Expression
1 tfrcllemsucfn.4 . . 3  |-  ( ph  ->  g : z --> S )
2 tfrcllemsucfn.3 . . . 4  |-  ( ph  ->  z  e.  X )
32elexd 2790 . . 3  |-  ( ph  ->  z  e.  _V )
4 tfrcl.x . . . . 5  |-  ( ph  ->  Ord  X )
5 ordelon 4448 . . . . 5  |-  ( ( Ord  X  /\  z  e.  X )  ->  z  e.  On )
64, 2, 5syl2anc 411 . . . 4  |-  ( ph  ->  z  e.  On )
7 eloni 4440 . . . 4  |-  ( z  e.  On  ->  Ord  z )
8 ordirr 4608 . . . 4  |-  ( Ord  z  ->  -.  z  e.  z )
96, 7, 83syl 17 . . 3  |-  ( ph  ->  -.  z  e.  z )
10 feq2 5429 . . . . . . 7  |-  ( x  =  z  ->  (
f : x --> S  <->  f :
z --> S ) )
1110imbi1d 231 . . . . . 6  |-  ( x  =  z  ->  (
( f : x --> S  ->  ( G `  f )  e.  S
)  <->  ( f : z --> S  ->  ( G `  f )  e.  S ) ) )
1211albidv 1848 . . . . 5  |-  ( x  =  z  ->  ( A. f ( f : x --> S  ->  ( G `  f )  e.  S )  <->  A. f
( f : z --> S  ->  ( G `  f )  e.  S
) ) )
13 tfrcl.ex . . . . . . . 8  |-  ( (
ph  /\  x  e.  X  /\  f : x --> S )  ->  ( G `  f )  e.  S )
14133expia 1208 . . . . . . 7  |-  ( (
ph  /\  x  e.  X )  ->  (
f : x --> S  -> 
( G `  f
)  e.  S ) )
1514alrimiv 1898 . . . . . 6  |-  ( (
ph  /\  x  e.  X )  ->  A. f
( f : x --> S  ->  ( G `  f )  e.  S
) )
1615ralrimiva 2581 . . . . 5  |-  ( ph  ->  A. x  e.  X  A. f ( f : x --> S  ->  ( G `  f )  e.  S ) )
1712, 16, 2rspcdva 2889 . . . 4  |-  ( ph  ->  A. f ( f : z --> S  -> 
( G `  f
)  e.  S ) )
18 feq1 5428 . . . . . 6  |-  ( f  =  g  ->  (
f : z --> S  <-> 
g : z --> S ) )
19 fveq2 5599 . . . . . . 7  |-  ( f  =  g  ->  ( G `  f )  =  ( G `  g ) )
2019eleq1d 2276 . . . . . 6  |-  ( f  =  g  ->  (
( G `  f
)  e.  S  <->  ( G `  g )  e.  S
) )
2118, 20imbi12d 234 . . . . 5  |-  ( f  =  g  ->  (
( f : z --> S  ->  ( G `  f )  e.  S
)  <->  ( g : z --> S  ->  ( G `  g )  e.  S ) ) )
2221spv 1884 . . . 4  |-  ( A. f ( f : z --> S  ->  ( G `  f )  e.  S )  ->  (
g : z --> S  ->  ( G `  g )  e.  S
) )
2317, 1, 22sylc 62 . . 3  |-  ( ph  ->  ( G `  g
)  e.  S )
24 fsnunf 5807 . . 3  |-  ( ( g : z --> S  /\  ( z  e. 
_V  /\  -.  z  e.  z )  /\  ( G `  g )  e.  S )  ->  (
g  u.  { <. z ,  ( G `  g ) >. } ) : ( z  u. 
{ z } ) --> S )
251, 3, 9, 23, 24syl121anc 1255 . 2  |-  ( ph  ->  ( g  u.  { <. z ,  ( G `
 g ) >. } ) : ( z  u.  { z } ) --> S )
26 df-suc 4436 . . 3  |-  suc  z  =  ( z  u. 
{ z } )
2726feq2i 5439 . 2  |-  ( ( g  u.  { <. z ,  ( G `  g ) >. } ) : suc  z --> S  <-> 
( g  u.  { <. z ,  ( G `
 g ) >. } ) : ( z  u.  { z } ) --> S )
2825, 27sylibr 134 1  |-  ( ph  ->  ( g  u.  { <. z ,  ( G `
 g ) >. } ) : suc  z
--> S )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    /\ w3a 981   A.wal 1371    = wceq 1373    e. wcel 2178   {cab 2193   A.wral 2486   E.wrex 2487   _Vcvv 2776    u. cun 3172   {csn 3643   <.cop 3646   Ord word 4427   Oncon0 4428   suc csuc 4430    |` cres 4695   Fun wfun 5284   -->wf 5286   ` cfv 5290  recscrecs 6413
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 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-setind 4603
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-ral 2491  df-rex 2492  df-v 2778  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-nul 3469  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-opab 4122  df-tr 4159  df-id 4358  df-iord 4431  df-on 4433  df-suc 4436  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-f1 5295  df-fo 5296  df-f1o 5297  df-fv 5298
This theorem is referenced by:  tfrcllemsucaccv  6463  tfrcllembfn  6466
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