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Theorem ccatcl 11024
Description: The concatenation of two words is a word. (Contributed by FL, 2-Feb-2014.) (Proof shortened by Stefan O'Rear, 15-Aug-2015.) (Proof shortened by AV, 29-Apr-2020.)
Assertion
Ref Expression
ccatcl  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( S ++  T )  e. Word  B )

Proof of Theorem ccatcl
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 wrdfin 10988 . . 3  |-  ( S  e. Word  B  ->  S  e.  Fin )
2 wrdfin 10988 . . 3  |-  ( T  e. Word  B  ->  T  e.  Fin )
3 ccatfvalfi 11023 . . 3  |-  ( ( S  e.  Fin  /\  T  e.  Fin )  ->  ( S ++  T )  =  ( x  e.  ( 0..^ ( ( `  S )  +  ( `  T ) ) ) 
|->  if ( x  e.  ( 0..^ ( `  S
) ) ,  ( S `  x ) ,  ( T `  ( x  -  ( `  S ) ) ) ) ) )
41, 2, 3syl2an 289 . 2  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( S ++  T )  =  ( x  e.  ( 0..^ ( ( `  S )  +  ( `  T ) ) ) 
|->  if ( x  e.  ( 0..^ ( `  S
) ) ,  ( S `  x ) ,  ( T `  ( x  -  ( `  S ) ) ) ) ) )
5 wrdf 10975 . . . . . . 7  |-  ( S  e. Word  B  ->  S : ( 0..^ ( `  S ) ) --> B )
65ad2antrr 488 . . . . . 6  |-  ( ( ( S  e. Word  B  /\  T  e. Word  B )  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  ->  S : ( 0..^ ( `  S
) ) --> B )
76ffvelcdmda 5709 . . . . 5  |-  ( ( ( ( S  e. Word  B  /\  T  e. Word  B
)  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  /\  x  e.  ( 0..^ ( `  S
) ) )  -> 
( S `  x
)  e.  B )
8 wrdf 10975 . . . . . . 7  |-  ( T  e. Word  B  ->  T : ( 0..^ ( `  T ) ) --> B )
98ad3antlr 493 . . . . . 6  |-  ( ( ( ( S  e. Word  B  /\  T  e. Word  B
)  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  /\  -.  x  e.  ( 0..^ ( `  S
) ) )  ->  T : ( 0..^ ( `  T ) ) --> B )
10 simpr 110 . . . . . . . 8  |-  ( ( ( S  e. Word  B  /\  T  e. Word  B )  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  ->  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )
1110anim1i 340 . . . . . . 7  |-  ( ( ( ( S  e. Word  B  /\  T  e. Word  B
)  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  /\  -.  x  e.  ( 0..^ ( `  S
) ) )  -> 
( x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) )  /\  -.  x  e.  (
0..^ ( `  S )
) ) )
12 lencl 10973 . . . . . . . . . 10  |-  ( S  e. Word  B  ->  ( `  S )  e.  NN0 )
1312nn0zd 9475 . . . . . . . . 9  |-  ( S  e. Word  B  ->  ( `  S )  e.  ZZ )
14 lencl 10973 . . . . . . . . . 10  |-  ( T  e. Word  B  ->  ( `  T )  e.  NN0 )
1514nn0zd 9475 . . . . . . . . 9  |-  ( T  e. Word  B  ->  ( `  T )  e.  ZZ )
1613, 15anim12i 338 . . . . . . . 8  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( ( `  S
)  e.  ZZ  /\  ( `  T )  e.  ZZ ) )
1716ad2antrr 488 . . . . . . 7  |-  ( ( ( ( S  e. Word  B  /\  T  e. Word  B
)  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  /\  -.  x  e.  ( 0..^ ( `  S
) ) )  -> 
( ( `  S
)  e.  ZZ  /\  ( `  T )  e.  ZZ ) )
18 fzocatel 10309 . . . . . . 7  |-  ( ( ( x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) )  /\  -.  x  e.  (
0..^ ( `  S )
) )  /\  (
( `  S )  e.  ZZ  /\  ( `  T
)  e.  ZZ ) )  ->  ( x  -  ( `  S )
)  e.  ( 0..^ ( `  T )
) )
1911, 17, 18syl2anc 411 . . . . . 6  |-  ( ( ( ( S  e. Word  B  /\  T  e. Word  B
)  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  /\  -.  x  e.  ( 0..^ ( `  S
) ) )  -> 
( x  -  ( `  S ) )  e.  ( 0..^ ( `  T
) ) )
209, 19ffvelcdmd 5710 . . . . 5  |-  ( ( ( ( S  e. Word  B  /\  T  e. Word  B
)  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  /\  -.  x  e.  ( 0..^ ( `  S
) ) )  -> 
( T `  (
x  -  ( `  S
) ) )  e.  B )
21 elfzoelz 10251 . . . . . . 7  |-  ( x  e.  ( 0..^ ( ( `  S )  +  ( `  T )
) )  ->  x  e.  ZZ )
2221adantl 277 . . . . . 6  |-  ( ( ( S  e. Word  B  /\  T  e. Word  B )  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  ->  x  e.  ZZ )
23 0zd 9366 . . . . . 6  |-  ( ( ( S  e. Word  B  /\  T  e. Word  B )  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  ->  0  e.  ZZ )
2413ad2antrr 488 . . . . . 6  |-  ( ( ( S  e. Word  B  /\  T  e. Word  B )  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  ->  ( `  S )  e.  ZZ )
25 fzodcel 10257 . . . . . 6  |-  ( ( x  e.  ZZ  /\  0  e.  ZZ  /\  ( `  S )  e.  ZZ )  -> DECID 
x  e.  ( 0..^ ( `  S )
) )
2622, 23, 24, 25syl3anc 1249 . . . . 5  |-  ( ( ( S  e. Word  B  /\  T  e. Word  B )  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  -> DECID 
x  e.  ( 0..^ ( `  S )
) )
277, 20, 26ifcldadc 3599 . . . 4  |-  ( ( ( S  e. Word  B  /\  T  e. Word  B )  /\  x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) )  ->  if ( x  e.  ( 0..^ ( `  S ) ) ,  ( S `  x
) ,  ( T `
 ( x  -  ( `  S ) ) ) )  e.  B
)
2827fmpttd 5729 . . 3  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) )  |->  if ( x  e.  ( 0..^ ( `  S
) ) ,  ( S `  x ) ,  ( T `  ( x  -  ( `  S ) ) ) ) ) : ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) --> B )
2912adantr 276 . . . 4  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( `  S )  e.  NN0 )
3014adantl 277 . . . 4  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( `  T )  e.  NN0 )
3129, 30nn0addcld 9334 . . 3  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( ( `  S
)  +  ( `  T
) )  e.  NN0 )
32 iswrdinn0 10974 . . 3  |-  ( ( ( x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) )  |->  if ( x  e.  ( 0..^ ( `  S
) ) ,  ( S `  x ) ,  ( T `  ( x  -  ( `  S ) ) ) ) ) : ( 0..^ ( ( `  S
)  +  ( `  T
) ) ) --> B  /\  ( ( `  S
)  +  ( `  T
) )  e.  NN0 )  ->  ( x  e.  ( 0..^ ( ( `  S )  +  ( `  T ) ) ) 
|->  if ( x  e.  ( 0..^ ( `  S
) ) ,  ( S `  x ) ,  ( T `  ( x  -  ( `  S ) ) ) ) )  e. Word  B
)
3328, 31, 32syl2anc 411 . 2  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( x  e.  ( 0..^ ( ( `  S
)  +  ( `  T
) ) )  |->  if ( x  e.  ( 0..^ ( `  S
) ) ,  ( S `  x ) ,  ( T `  ( x  -  ( `  S ) ) ) ) )  e. Word  B
)
344, 33eqeltrd 2281 1  |-  ( ( S  e. Word  B  /\  T  e. Word  B )  ->  ( S ++  T )  e. Word  B )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104  DECID wdc 835    = wceq 1372    e. wcel 2175   ifcif 3570    |-> cmpt 4104   -->wf 5264   ` cfv 5268  (class class class)co 5934   Fincfn 6817   0cc0 7907    + caddc 7910    - cmin 8225   NN0cn0 9277   ZZcz 9354  ..^cfzo 10246  ♯chash 10901  Word cword 10969   ++ cconcat 11021
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 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-13 2177  ax-14 2178  ax-ext 2186  ax-coll 4158  ax-sep 4161  ax-nul 4169  ax-pow 4217  ax-pr 4252  ax-un 4478  ax-setind 4583  ax-iinf 4634  ax-cnex 7998  ax-resscn 7999  ax-1cn 8000  ax-1re 8001  ax-icn 8002  ax-addcl 8003  ax-addrcl 8004  ax-mulcl 8005  ax-addcom 8007  ax-addass 8009  ax-distr 8011  ax-i2m1 8012  ax-0lt1 8013  ax-0id 8015  ax-rnegex 8016  ax-cnre 8018  ax-pre-ltirr 8019  ax-pre-ltwlin 8020  ax-pre-lttrn 8021  ax-pre-apti 8022  ax-pre-ltadd 8023
This theorem depends on definitions:  df-bi 117  df-dc 836  df-3or 981  df-3an 982  df-tru 1375  df-fal 1378  df-nf 1483  df-sb 1785  df-eu 2056  df-mo 2057  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ne 2376  df-nel 2471  df-ral 2488  df-rex 2489  df-reu 2490  df-rab 2492  df-v 2773  df-sbc 2998  df-csb 3093  df-dif 3167  df-un 3169  df-in 3171  df-ss 3178  df-nul 3460  df-if 3571  df-pw 3617  df-sn 3638  df-pr 3639  df-op 3641  df-uni 3850  df-int 3885  df-iun 3928  df-br 4044  df-opab 4105  df-mpt 4106  df-tr 4142  df-id 4338  df-iord 4411  df-on 4413  df-ilim 4414  df-suc 4416  df-iom 4637  df-xp 4679  df-rel 4680  df-cnv 4681  df-co 4682  df-dm 4683  df-rn 4684  df-res 4685  df-ima 4686  df-iota 5229  df-fun 5270  df-fn 5271  df-f 5272  df-f1 5273  df-fo 5274  df-f1o 5275  df-fv 5276  df-riota 5889  df-ov 5937  df-oprab 5938  df-mpo 5939  df-1st 6216  df-2nd 6217  df-recs 6381  df-frec 6467  df-1o 6492  df-er 6610  df-en 6818  df-dom 6819  df-fin 6820  df-pnf 8091  df-mnf 8092  df-xr 8093  df-ltxr 8094  df-le 8095  df-sub 8227  df-neg 8228  df-inn 9019  df-n0 9278  df-z 9355  df-uz 9631  df-fz 10113  df-fzo 10247  df-ihash 10902  df-word 10970  df-concat 11022
This theorem is referenced by:  ccatclab  11025  ccatsymb  11033  ccatass  11039  lswccatn0lsw  11042
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