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Theorem pfxccatin12d 11292
Description: The subword of a concatenation of two words within both of the concatenated words. (Contributed by AV, 31-May-2018.) (Revised by AV, 10-May-2020.)
Hypotheses
Ref Expression
swrdccatind.l  |-  ( ph  ->  ( `  A )  =  L )
swrdccatind.w  |-  ( ph  ->  ( A  e. Word  V  /\  B  e. Word  V ) )
pfxccatin12d.m  |-  ( ph  ->  M  e.  ( 0 ... L ) )
pfxccatin12d.n  |-  ( ph  ->  N  e.  ( L ... ( L  +  ( `  B ) ) ) )
Assertion
Ref Expression
pfxccatin12d  |-  ( ph  ->  ( ( A ++  B
) substr  <. M ,  N >. )  =  ( ( A substr  <. M ,  L >. ) ++  ( B prefix  ( N  -  L )
) ) )

Proof of Theorem pfxccatin12d
StepHypRef Expression
1 swrdccatind.w . . 3  |-  ( ph  ->  ( A  e. Word  V  /\  B  e. Word  V ) )
2 pfxccatin12d.m . . . 4  |-  ( ph  ->  M  e.  ( 0 ... L ) )
3 pfxccatin12d.n . . . 4  |-  ( ph  ->  N  e.  ( L ... ( L  +  ( `  B ) ) ) )
4 swrdccatind.l . . . . . . 7  |-  ( ph  ->  ( `  A )  =  L )
54oveq2d 6023 . . . . . 6  |-  ( ph  ->  ( 0 ... ( `  A ) )  =  ( 0 ... L
) )
65eleq2d 2299 . . . . 5  |-  ( ph  ->  ( M  e.  ( 0 ... ( `  A
) )  <->  M  e.  ( 0 ... L
) ) )
74oveq1d 6022 . . . . . . 7  |-  ( ph  ->  ( ( `  A
)  +  ( `  B
) )  =  ( L  +  ( `  B
) ) )
84, 7oveq12d 6025 . . . . . 6  |-  ( ph  ->  ( ( `  A
) ... ( ( `  A
)  +  ( `  B
) ) )  =  ( L ... ( L  +  ( `  B
) ) ) )
98eleq2d 2299 . . . . 5  |-  ( ph  ->  ( N  e.  ( ( `  A ) ... ( ( `  A
)  +  ( `  B
) ) )  <->  N  e.  ( L ... ( L  +  ( `  B
) ) ) ) )
106, 9anbi12d 473 . . . 4  |-  ( ph  ->  ( ( M  e.  ( 0 ... ( `  A ) )  /\  N  e.  ( ( `  A ) ... (
( `  A )  +  ( `  B )
) ) )  <->  ( M  e.  ( 0 ... L
)  /\  N  e.  ( L ... ( L  +  ( `  B
) ) ) ) ) )
112, 3, 10mpbir2and 950 . . 3  |-  ( ph  ->  ( M  e.  ( 0 ... ( `  A
) )  /\  N  e.  ( ( `  A
) ... ( ( `  A
)  +  ( `  B
) ) ) ) )
12 eqid 2229 . . . 4  |-  ( `  A
)  =  ( `  A
)
1312pfxccatin12 11280 . . 3  |-  ( ( A  e. Word  V  /\  B  e. Word  V )  ->  ( ( M  e.  ( 0 ... ( `  A ) )  /\  N  e.  ( ( `  A ) ... (
( `  A )  +  ( `  B )
) ) )  -> 
( ( A ++  B
) substr  <. M ,  N >. )  =  ( ( A substr  <. M ,  ( `  A ) >. ) ++  ( B prefix  ( N  -  ( `  A ) ) ) ) ) )
141, 11, 13sylc 62 . 2  |-  ( ph  ->  ( ( A ++  B
) substr  <. M ,  N >. )  =  ( ( A substr  <. M ,  ( `  A ) >. ) ++  ( B prefix  ( N  -  ( `  A ) ) ) ) )
154opeq2d 3864 . . . 4  |-  ( ph  -> 
<. M ,  ( `  A
) >.  =  <. M ,  L >. )
1615oveq2d 6023 . . 3  |-  ( ph  ->  ( A substr  <. M , 
( `  A ) >.
)  =  ( A substr  <. M ,  L >. ) )
174oveq2d 6023 . . . 4  |-  ( ph  ->  ( N  -  ( `  A ) )  =  ( N  -  L
) )
1817oveq2d 6023 . . 3  |-  ( ph  ->  ( B prefix  ( N  -  ( `  A
) ) )  =  ( B prefix  ( N  -  L ) ) )
1916, 18oveq12d 6025 . 2  |-  ( ph  ->  ( ( A substr  <. M , 
( `  A ) >.
) ++  ( B prefix  ( N  -  ( `  A
) ) ) )  =  ( ( A substr  <. M ,  L >. ) ++  ( B prefix  ( N  -  L ) ) ) )
2014, 19eqtrd 2262 1  |-  ( ph  ->  ( ( A ++  B
) substr  <. M ,  N >. )  =  ( ( A substr  <. M ,  L >. ) ++  ( B prefix  ( N  -  L )
) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1395    e. wcel 2200   <.cop 3669   ` cfv 5318  (class class class)co 6007   0cc0 8010    + caddc 8013    - cmin 8328   ...cfz 10216  ♯chash 11009  Word cword 11084   ++ cconcat 11138   substr csubstr 11192   prefix cpfx 11219
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4199  ax-sep 4202  ax-nul 4210  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-iinf 4680  ax-cnex 8101  ax-resscn 8102  ax-1cn 8103  ax-1re 8104  ax-icn 8105  ax-addcl 8106  ax-addrcl 8107  ax-mulcl 8108  ax-addcom 8110  ax-addass 8112  ax-distr 8114  ax-i2m1 8115  ax-0lt1 8116  ax-0id 8118  ax-rnegex 8119  ax-cnre 8121  ax-pre-ltirr 8122  ax-pre-ltwlin 8123  ax-pre-lttrn 8124  ax-pre-apti 8125  ax-pre-ltadd 8126
This theorem depends on definitions:  df-bi 117  df-dc 840  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-if 3603  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-iun 3967  df-br 4084  df-opab 4146  df-mpt 4147  df-tr 4183  df-id 4384  df-iord 4457  df-on 4459  df-ilim 4460  df-suc 4462  df-iom 4683  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-riota 5960  df-ov 6010  df-oprab 6011  df-mpo 6012  df-1st 6292  df-2nd 6293  df-recs 6457  df-frec 6543  df-1o 6568  df-er 6688  df-en 6896  df-dom 6897  df-fin 6898  df-pnf 8194  df-mnf 8195  df-xr 8196  df-ltxr 8197  df-le 8198  df-sub 8330  df-neg 8331  df-inn 9122  df-n0 9381  df-z 9458  df-uz 9734  df-fz 10217  df-fzo 10351  df-ihash 11010  df-word 11085  df-concat 11139  df-substr 11193  df-pfx 11220
This theorem is referenced by: (None)
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