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Theorem ialgr0 12800
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 5691 . 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 12799 . . . 4  |-  ( (
ph  /\  x  e.  ( ZZ>= `  M )
)  ->  ( ( Z  X.  { A }
) `  x )  e.  S )
7 algrf.5 . . . . 5  |-  ( ph  ->  F : S --> S )
87ialgrlem1st 12798 . . . 4  |-  ( (
ph  /\  ( x  e.  S  /\  y  e.  S ) )  -> 
( x ( F  o.  1st ) y )  e.  S )
93, 6, 8seq3-1 10877 . . 3  |-  ( ph  ->  (  seq M ( ( F  o.  1st ) ,  ( Z  X.  { A } ) ) `  M )  =  ( ( Z  X.  { A }
) `  M )
)
10 uzid 9915 . . . . . 6  |-  ( M  e.  ZZ  ->  M  e.  ( ZZ>= `  M )
)
113, 10syl 14 . . . . 5  |-  ( ph  ->  M  e.  ( ZZ>= `  M ) )
1211, 4eleqtrrdi 2332 . . . 4  |-  ( ph  ->  M  e.  Z )
13 fvconst2g 5920 . . . 4  |-  ( ( A  e.  S  /\  M  e.  Z )  ->  ( ( Z  X.  { A } ) `  M )  =  A )
145, 12, 13syl2anc 415 . . 3  |-  ( ph  ->  ( ( Z  X.  { A } ) `  M )  =  A )
159, 14eqtrd 2271 . 2  |-  ( ph  ->  (  seq M ( ( F  o.  1st ) ,  ( Z  X.  { A } ) ) `  M )  =  A )
162, 15eqtrid 2283 1  |-  ( ph  ->  ( R `  M
)  =  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1402    e. wcel 2209   {csn 3705    X. cxp 4767    o. ccom 4773   -->wf 5368   ` cfv 5372   1stc1st 6362   ZZcz 9623   ZZ>=cuz 9900    seqcseq 10862
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4241  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-iinf 4730  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-addcom 8269  ax-addass 8271  ax-distr 8273  ax-i2m1 8274  ax-0lt1 8275  ax-0id 8277  ax-rnegex 8278  ax-cnre 8280  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283  ax-pre-ltadd 8285
This theorem depends on definitions:  df-bi 117  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-tr 4225  df-id 4433  df-iord 4506  df-on 4508  df-ilim 4509  df-suc 4511  df-iom 4733  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-1st 6364  df-2nd 6365  df-recs 6566  df-frec 6652  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-sub 8489  df-neg 8490  df-inn 9284  df-n0 9543  df-z 9624  df-uz 9901  df-seqfrec 10863
This theorem is referenced by:  algcvg  12804  eucalg  12815
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