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Theorem ialgr0 12696
Description: The value of the algorithm iterator  R at  0 is the initial state  A. (Contributed by Paul Chapman, 31-Mar-2011.) (Revised by Jim Kingdon, 12-Mar-2023.)
Hypotheses
Ref Expression
algrf.1  |-  Z  =  ( ZZ>= `  M )
algrf.2  |-  R  =  seq M ( ( F  o.  1st ) ,  ( Z  X.  { A } ) )
algrf.3  |-  ( ph  ->  M  e.  ZZ )
algrf.4  |-  ( ph  ->  A  e.  S )
algrf.5  |-  ( ph  ->  F : S --> S )
Assertion
Ref Expression
ialgr0  |-  ( ph  ->  ( R `  M
)  =  A )

Proof of Theorem ialgr0
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 algrf.2 . . 3  |-  R  =  seq M ( ( F  o.  1st ) ,  ( Z  X.  { A } ) )
21fveq1i 5649 . 2  |-  ( R `
 M )  =  (  seq M ( ( F  o.  1st ) ,  ( Z  X.  { A } ) ) `  M )
3 algrf.3 . . . 4  |-  ( ph  ->  M  e.  ZZ )
4 algrf.1 . . . . 5  |-  Z  =  ( ZZ>= `  M )
5 algrf.4 . . . . 5  |-  ( ph  ->  A  e.  S )
64, 5ialgrlemconst 12695 . . . 4  |-  ( (
ph  /\  x  e.  ( ZZ>= `  M )
)  ->  ( ( Z  X.  { A }
) `  x )  e.  S )
7 algrf.5 . . . . 5  |-  ( ph  ->  F : S --> S )
87ialgrlem1st 12694 . . . 4  |-  ( (
ph  /\  ( x  e.  S  /\  y  e.  S ) )  -> 
( x ( F  o.  1st ) y )  e.  S )
93, 6, 8seq3-1 10787 . . 3  |-  ( ph  ->  (  seq M ( ( F  o.  1st ) ,  ( Z  X.  { A } ) ) `  M )  =  ( ( Z  X.  { A }
) `  M )
)
10 uzid 9831 . . . . . 6  |-  ( M  e.  ZZ  ->  M  e.  ( ZZ>= `  M )
)
113, 10syl 14 . . . . 5  |-  ( ph  ->  M  e.  ( ZZ>= `  M ) )
1211, 4eleqtrrdi 2325 . . . 4  |-  ( ph  ->  M  e.  Z )
13 fvconst2g 5876 . . . 4  |-  ( ( A  e.  S  /\  M  e.  Z )  ->  ( ( Z  X.  { A } ) `  M )  =  A )
145, 12, 13syl2anc 411 . . 3  |-  ( ph  ->  ( ( Z  X.  { A } ) `  M )  =  A )
159, 14eqtrd 2264 . 2  |-  ( ph  ->  (  seq M ( ( F  o.  1st ) ,  ( Z  X.  { A } ) ) `  M )  =  A )
162, 15eqtrid 2276 1  |-  ( ph  ->  ( R `  M
)  =  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1398    e. wcel 2202   {csn 3673    X. cxp 4729    o. ccom 4735   -->wf 5329   ` cfv 5333   1stc1st 6310   ZZcz 9540   ZZ>=cuz 9816    seqcseq 10772
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-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4209  ax-sep 4212  ax-nul 4220  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-setind 4641  ax-iinf 4692  ax-cnex 8183  ax-resscn 8184  ax-1cn 8185  ax-1re 8186  ax-icn 8187  ax-addcl 8188  ax-addrcl 8189  ax-mulcl 8190  ax-addcom 8192  ax-addass 8194  ax-distr 8196  ax-i2m1 8197  ax-0lt1 8198  ax-0id 8200  ax-rnegex 8201  ax-cnre 8203  ax-pre-ltirr 8204  ax-pre-ltwlin 8205  ax-pre-lttrn 8206  ax-pre-ltadd 8208
This theorem depends on definitions:  df-bi 117  df-3or 1006  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-nel 2499  df-ral 2516  df-rex 2517  df-reu 2518  df-rab 2520  df-v 2805  df-sbc 3033  df-csb 3129  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-int 3934  df-iun 3977  df-br 4094  df-opab 4156  df-mpt 4157  df-tr 4193  df-id 4396  df-iord 4469  df-on 4471  df-ilim 4472  df-suc 4474  df-iom 4695  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744  df-iota 5293  df-fun 5335  df-fn 5336  df-f 5337  df-f1 5338  df-fo 5339  df-f1o 5340  df-fv 5341  df-riota 5981  df-ov 6031  df-oprab 6032  df-mpo 6033  df-1st 6312  df-2nd 6313  df-recs 6514  df-frec 6600  df-pnf 8275  df-mnf 8276  df-xr 8277  df-ltxr 8278  df-le 8279  df-sub 8411  df-neg 8412  df-inn 9203  df-n0 9462  df-z 9541  df-uz 9817  df-seqfrec 10773
This theorem is referenced by:  algcvg  12700  eucalg  12711
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