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Theorem enumctlemm 7079
Description: Lemma for enumct 7080. The case where  N is greater than zero. (Contributed by Jim Kingdon, 13-Mar-2023.)
Hypotheses
Ref Expression
enumctlemm.f  |-  ( ph  ->  F : N -onto-> A
)
enumctlemm.n  |-  ( ph  ->  N  e.  om )
enumctlemm.n0  |-  ( ph  -> 
(/)  e.  N )
enumctlemm.g  |-  G  =  ( k  e.  om  |->  if ( k  e.  N ,  ( F `  k ) ,  ( F `  (/) ) ) )
Assertion
Ref Expression
enumctlemm  |-  ( ph  ->  G : om -onto-> A
)
Distinct variable groups:    A, k    k, F    k, N    ph, k
Allowed substitution hint:    G( k)

Proof of Theorem enumctlemm
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 enumctlemm.f . . . . . . 7  |-  ( ph  ->  F : N -onto-> A
)
2 fof 5410 . . . . . . 7  |-  ( F : N -onto-> A  ->  F : N --> A )
31, 2syl 14 . . . . . 6  |-  ( ph  ->  F : N --> A )
43ffvelrnda 5620 . . . . 5  |-  ( (
ph  /\  k  e.  N )  ->  ( F `  k )  e.  A )
54adantlr 469 . . . 4  |-  ( ( ( ph  /\  k  e.  om )  /\  k  e.  N )  ->  ( F `  k )  e.  A )
6 enumctlemm.n0 . . . . . 6  |-  ( ph  -> 
(/)  e.  N )
73, 6ffvelrnd 5621 . . . . 5  |-  ( ph  ->  ( F `  (/) )  e.  A )
87ad2antrr 480 . . . 4  |-  ( ( ( ph  /\  k  e.  om )  /\  -.  k  e.  N )  ->  ( F `  (/) )  e.  A )
9 simpr 109 . . . . 5  |-  ( (
ph  /\  k  e.  om )  ->  k  e.  om )
10 enumctlemm.n . . . . . 6  |-  ( ph  ->  N  e.  om )
1110adantr 274 . . . . 5  |-  ( (
ph  /\  k  e.  om )  ->  N  e.  om )
12 nndcel 6468 . . . . 5  |-  ( ( k  e.  om  /\  N  e.  om )  -> DECID  k  e.  N )
139, 11, 12syl2anc 409 . . . 4  |-  ( (
ph  /\  k  e.  om )  -> DECID  k  e.  N
)
145, 8, 13ifcldadc 3549 . . 3  |-  ( (
ph  /\  k  e.  om )  ->  if (
k  e.  N , 
( F `  k
) ,  ( F `
 (/) ) )  e.  A )
15 enumctlemm.g . . 3  |-  G  =  ( k  e.  om  |->  if ( k  e.  N ,  ( F `  k ) ,  ( F `  (/) ) ) )
1614, 15fmptd 5639 . 2  |-  ( ph  ->  G : om --> A )
17 foelrn 5721 . . . . . 6  |-  ( ( F : N -onto-> A  /\  y  e.  A
)  ->  E. x  e.  N  y  =  ( F `  x ) )
181, 17sylan 281 . . . . 5  |-  ( (
ph  /\  y  e.  A )  ->  E. x  e.  N  y  =  ( F `  x ) )
19 eleq1w 2227 . . . . . . . . . . 11  |-  ( k  =  x  ->  (
k  e.  N  <->  x  e.  N ) )
20 fveq2 5486 . . . . . . . . . . 11  |-  ( k  =  x  ->  ( F `  k )  =  ( F `  x ) )
2119, 20ifbieq1d 3542 . . . . . . . . . 10  |-  ( k  =  x  ->  if ( k  e.  N ,  ( F `  k ) ,  ( F `  (/) ) )  =  if ( x  e.  N ,  ( F `  x ) ,  ( F `  (/) ) ) )
22 simpr 109 . . . . . . . . . . 11  |-  ( (
ph  /\  x  e.  N )  ->  x  e.  N )
2310adantr 274 . . . . . . . . . . 11  |-  ( (
ph  /\  x  e.  N )  ->  N  e.  om )
24 elnn 4583 . . . . . . . . . . 11  |-  ( ( x  e.  N  /\  N  e.  om )  ->  x  e.  om )
2522, 23, 24syl2anc 409 . . . . . . . . . 10  |-  ( (
ph  /\  x  e.  N )  ->  x  e.  om )
2622iftrued 3527 . . . . . . . . . . 11  |-  ( (
ph  /\  x  e.  N )  ->  if ( x  e.  N ,  ( F `  x ) ,  ( F `  (/) ) )  =  ( F `  x ) )
273ffvelrnda 5620 . . . . . . . . . . 11  |-  ( (
ph  /\  x  e.  N )  ->  ( F `  x )  e.  A )
2826, 27eqeltrd 2243 . . . . . . . . . 10  |-  ( (
ph  /\  x  e.  N )  ->  if ( x  e.  N ,  ( F `  x ) ,  ( F `  (/) ) )  e.  A )
2915, 21, 25, 28fvmptd3 5579 . . . . . . . . 9  |-  ( (
ph  /\  x  e.  N )  ->  ( G `  x )  =  if ( x  e.  N ,  ( F `
 x ) ,  ( F `  (/) ) ) )
3029, 26eqtrd 2198 . . . . . . . 8  |-  ( (
ph  /\  x  e.  N )  ->  ( G `  x )  =  ( F `  x ) )
3130eqeq2d 2177 . . . . . . 7  |-  ( (
ph  /\  x  e.  N )  ->  (
y  =  ( G `
 x )  <->  y  =  ( F `  x ) ) )
3231rexbidva 2463 . . . . . 6  |-  ( ph  ->  ( E. x  e.  N  y  =  ( G `  x )  <->  E. x  e.  N  y  =  ( F `  x ) ) )
3332adantr 274 . . . . 5  |-  ( (
ph  /\  y  e.  A )  ->  ( E. x  e.  N  y  =  ( G `  x )  <->  E. x  e.  N  y  =  ( F `  x ) ) )
3418, 33mpbird 166 . . . 4  |-  ( (
ph  /\  y  e.  A )  ->  E. x  e.  N  y  =  ( G `  x ) )
35 omelon 4586 . . . . . . 7  |-  om  e.  On
3635onelssi 4407 . . . . . 6  |-  ( N  e.  om  ->  N  C_ 
om )
37 ssrexv 3207 . . . . . 6  |-  ( N 
C_  om  ->  ( E. x  e.  N  y  =  ( G `  x )  ->  E. x  e.  om  y  =  ( G `  x ) ) )
3810, 36, 373syl 17 . . . . 5  |-  ( ph  ->  ( E. x  e.  N  y  =  ( G `  x )  ->  E. x  e.  om  y  =  ( G `  x ) ) )
3938adantr 274 . . . 4  |-  ( (
ph  /\  y  e.  A )  ->  ( E. x  e.  N  y  =  ( G `  x )  ->  E. x  e.  om  y  =  ( G `  x ) ) )
4034, 39mpd 13 . . 3  |-  ( (
ph  /\  y  e.  A )  ->  E. x  e.  om  y  =  ( G `  x ) )
4140ralrimiva 2539 . 2  |-  ( ph  ->  A. y  e.  A  E. x  e.  om  y  =  ( G `  x ) )
42 dffo3 5632 . 2  |-  ( G : om -onto-> A  <->  ( G : om --> A  /\  A. y  e.  A  E. x  e.  om  y  =  ( G `  x ) ) )
4316, 41, 42sylanbrc 414 1  |-  ( ph  ->  G : om -onto-> A
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 103    <-> wb 104  DECID wdc 824    = wceq 1343    e. wcel 2136   A.wral 2444   E.wrex 2445    C_ wss 3116   (/)c0 3409   ifcif 3520    |-> cmpt 4043   omcom 4567   -->wf 5184   -onto->wfo 5186   ` cfv 5188
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-ral 2449  df-rex 2450  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-iord 4344  df-on 4346  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-fo 5194  df-fv 5196
This theorem is referenced by:  enumct  7080
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