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Theorem pfxsuffeqwrdeq 11283
Description: Two words are equal if and only if they have the same prefix and the same suffix. (Contributed by Alexander van der Vekens, 23-Sep-2018.) (Revised by AV, 5-May-2020.)
Assertion
Ref Expression
pfxsuffeqwrdeq  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( W  =  S  <-> 
( ( `  W
)  =  ( `  S
)  /\  ( ( W prefix  I )  =  ( S prefix  I )  /\  ( W substr  <. I ,  ( `  W ) >. )  =  ( S substr  <. I ,  ( `  W
) >. ) ) ) ) )

Proof of Theorem pfxsuffeqwrdeq
Dummy variable  i is distinct from all other variables.
StepHypRef Expression
1 eqwrd 11158 . . 3  |-  ( ( W  e. Word  V  /\  S  e. Word  V )  ->  ( W  =  S  <-> 
( ( `  W
)  =  ( `  S
)  /\  A. i  e.  ( 0..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) ) ) )
213adant3 1043 . 2  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( W  =  S  <-> 
( ( `  W
)  =  ( `  S
)  /\  A. i  e.  ( 0..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) ) ) )
3 elfzofz 10398 . . . . . . . . 9  |-  ( I  e.  ( 0..^ ( `  W ) )  ->  I  e.  ( 0 ... ( `  W
) ) )
4 fzosplit 10414 . . . . . . . . 9  |-  ( I  e.  ( 0 ... ( `  W )
)  ->  ( 0..^ ( `  W )
)  =  ( ( 0..^ I )  u.  ( I..^ ( `  W
) ) ) )
53, 4syl 14 . . . . . . . 8  |-  ( I  e.  ( 0..^ ( `  W ) )  -> 
( 0..^ ( `  W
) )  =  ( ( 0..^ I )  u.  ( I..^ ( `  W ) ) ) )
653ad2ant3 1046 . . . . . . 7  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( 0..^ ( `  W
) )  =  ( ( 0..^ I )  u.  ( I..^ ( `  W ) ) ) )
76adantr 276 . . . . . 6  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( 0..^ ( `  W
) )  =  ( ( 0..^ I )  u.  ( I..^ ( `  W ) ) ) )
87raleqdv 2736 . . . . 5  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( A. i  e.  ( 0..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
)  <->  A. i  e.  ( ( 0..^ I )  u.  ( I..^ ( `  W ) ) ) ( W `  i
)  =  ( S `
 i ) ) )
9 ralunb 3388 . . . . 5  |-  ( A. i  e.  ( (
0..^ I )  u.  ( I..^ ( `  W
) ) ) ( W `  i )  =  ( S `  i )  <->  ( A. i  e.  ( 0..^ I ) ( W `
 i )  =  ( S `  i
)  /\  A. i  e.  ( I..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) ) )
108, 9bitrdi 196 . . . 4  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( A. i  e.  ( 0..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
)  <->  ( A. i  e.  ( 0..^ I ) ( W `  i
)  =  ( S `
 i )  /\  A. i  e.  ( I..^ ( `  W )
) ( W `  i )  =  ( S `  i ) ) ) )
11 eqidd 2232 . . . . . 6  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  ->  I  =  I )
12 3simpa 1020 . . . . . . . 8  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( W  e. Word  V  /\  S  e. Word  V ) )
1312adantr 276 . . . . . . 7  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( W  e. Word  V  /\  S  e. Word  V ) )
14 elfzonn0 10426 . . . . . . . . . 10  |-  ( I  e.  ( 0..^ ( `  W ) )  ->  I  e.  NN0 )
1514, 14jca 306 . . . . . . . . 9  |-  ( I  e.  ( 0..^ ( `  W ) )  -> 
( I  e.  NN0  /\  I  e.  NN0 )
)
16153ad2ant3 1046 . . . . . . . 8  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( I  e.  NN0  /\  I  e.  NN0 )
)
1716adantr 276 . . . . . . 7  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( I  e.  NN0  /\  I  e.  NN0 )
)
18 elfzo0le 10425 . . . . . . . . 9  |-  ( I  e.  ( 0..^ ( `  W ) )  ->  I  <_  ( `  W )
)
19183ad2ant3 1046 . . . . . . . 8  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  ->  I  <_  ( `  W )
)
2019adantr 276 . . . . . . 7  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  ->  I  <_  ( `  W )
)
21 breq2 4092 . . . . . . . . 9  |-  ( ( `  W )  =  ( `  S )  ->  (
I  <_  ( `  W
)  <->  I  <_  ( `  S
) ) )
2221adantl 277 . . . . . . . 8  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( I  <_  ( `  W )  <->  I  <_  ( `  S ) ) )
2320, 22mpbid 147 . . . . . . 7  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  ->  I  <_  ( `  S )
)
24 pfxeq 11281 . . . . . . 7  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V )  /\  ( I  e. 
NN0  /\  I  e.  NN0 )  /\  ( I  <_  ( `  W )  /\  I  <_  ( `  S
) ) )  -> 
( ( W prefix  I
)  =  ( S prefix 
I )  <->  ( I  =  I  /\  A. i  e.  ( 0..^ I ) ( W `  i
)  =  ( S `
 i ) ) ) )
2513, 17, 20, 23, 24syl112anc 1277 . . . . . 6  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( ( W prefix  I
)  =  ( S prefix 
I )  <->  ( I  =  I  /\  A. i  e.  ( 0..^ I ) ( W `  i
)  =  ( S `
 i ) ) ) )
2611, 25mpbirand 441 . . . . 5  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( ( W prefix  I
)  =  ( S prefix 
I )  <->  A. i  e.  ( 0..^ I ) ( W `  i
)  =  ( S `
 i ) ) )
27 lencl 11121 . . . . . . . . 9  |-  ( W  e. Word  V  ->  ( `  W )  e.  NN0 )
2827, 14anim12ci 339 . . . . . . . 8  |-  ( ( W  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  ->  (
I  e.  NN0  /\  ( `  W )  e. 
NN0 ) )
29283adant2 1042 . . . . . . 7  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( I  e.  NN0  /\  ( `  W )  e.  NN0 ) )
3029adantr 276 . . . . . 6  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( I  e.  NN0  /\  ( `  W )  e.  NN0 ) )
3127nn0red 9456 . . . . . . . . . 10  |-  ( W  e. Word  V  ->  ( `  W )  e.  RR )
3231leidd 8694 . . . . . . . . 9  |-  ( W  e. Word  V  ->  ( `  W )  <_  ( `  W ) )
3332adantr 276 . . . . . . . 8  |-  ( ( W  e. Word  V  /\  ( `  W )  =  ( `  S )
)  ->  ( `  W
)  <_  ( `  W
) )
34 eqle 8271 . . . . . . . . 9  |-  ( ( ( `  W )  e.  RR  /\  ( `  W
)  =  ( `  S
) )  ->  ( `  W )  <_  ( `  S ) )
3531, 34sylan 283 . . . . . . . 8  |-  ( ( W  e. Word  V  /\  ( `  W )  =  ( `  S )
)  ->  ( `  W
)  <_  ( `  S
) )
3633, 35jca 306 . . . . . . 7  |-  ( ( W  e. Word  V  /\  ( `  W )  =  ( `  S )
)  ->  ( ( `  W )  <_  ( `  W )  /\  ( `  W )  <_  ( `  S ) ) )
37363ad2antl1 1185 . . . . . 6  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( ( `  W
)  <_  ( `  W
)  /\  ( `  W
)  <_  ( `  S
) ) )
38 swrdspsleq 11252 . . . . . 6  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V )  /\  ( I  e. 
NN0  /\  ( `  W
)  e.  NN0 )  /\  ( ( `  W
)  <_  ( `  W
)  /\  ( `  W
)  <_  ( `  S
) ) )  -> 
( ( W substr  <. I ,  ( `  W ) >. )  =  ( S substr  <. I ,  ( `  W
) >. )  <->  A. i  e.  ( I..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) ) )
3913, 30, 37, 38syl3anc 1273 . . . . 5  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( ( W substr  <. I ,  ( `  W ) >. )  =  ( S substr  <. I ,  ( `  W
) >. )  <->  A. i  e.  ( I..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) ) )
4026, 39anbi12d 473 . . . 4  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( ( ( W prefix 
I )  =  ( S prefix  I )  /\  ( W substr  <. I ,  ( `  W ) >. )  =  ( S substr  <. I ,  ( `  W
) >. ) )  <->  ( A. i  e.  ( 0..^ I ) ( W `
 i )  =  ( S `  i
)  /\  A. i  e.  ( I..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) ) ) )
4110, 40bitr4d 191 . . 3  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( A. i  e.  ( 0..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
)  <->  ( ( W prefix 
I )  =  ( S prefix  I )  /\  ( W substr  <. I ,  ( `  W ) >. )  =  ( S substr  <. I ,  ( `  W
) >. ) ) ) )
4241pm5.32da 452 . 2  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( ( ( `  W
)  =  ( `  S
)  /\  A. i  e.  ( 0..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) )  <->  ( ( `  W )  =  ( `  S )  /\  (
( W prefix  I )  =  ( S prefix  I
)  /\  ( W substr  <.
I ,  ( `  W
) >. )  =  ( S substr  <. I ,  ( `  W ) >. )
) ) ) )
432, 42bitrd 188 1  |-  ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W
) ) )  -> 
( W  =  S  <-> 
( ( `  W
)  =  ( `  S
)  /\  ( ( W prefix  I )  =  ( S prefix  I )  /\  ( W substr  <. I ,  ( `  W ) >. )  =  ( S substr  <. I ,  ( `  W
) >. ) ) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    /\ w3a 1004    = wceq 1397    e. wcel 2202   A.wral 2510    u. cun 3198   <.cop 3672   class class class wbr 4088   ` cfv 5326  (class class class)co 6018   RRcr 8031   0cc0 8032    <_ cle 8215   NN0cn0 9402   ...cfz 10243  ..^cfzo 10377  ♯chash 11038  Word cword 11117   substr csubstr 11230   prefix cpfx 11257
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-iinf 4686  ax-cnex 8123  ax-resscn 8124  ax-1cn 8125  ax-1re 8126  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-addcom 8132  ax-addass 8134  ax-distr 8136  ax-i2m1 8137  ax-0lt1 8138  ax-0id 8140  ax-rnegex 8141  ax-cnre 8143  ax-pre-ltirr 8144  ax-pre-ltwlin 8145  ax-pre-lttrn 8146  ax-pre-apti 8147  ax-pre-ltadd 8148
This theorem depends on definitions:  df-bi 117  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-ilim 4466  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-1st 6303  df-2nd 6304  df-recs 6471  df-frec 6557  df-1o 6582  df-er 6702  df-en 6910  df-dom 6911  df-fin 6912  df-pnf 8216  df-mnf 8217  df-xr 8218  df-ltxr 8219  df-le 8220  df-sub 8352  df-neg 8353  df-inn 9144  df-n0 9403  df-z 9480  df-uz 9756  df-fz 10244  df-fzo 10378  df-ihash 11039  df-word 11118  df-substr 11231  df-pfx 11258
This theorem is referenced by:  pfxsuff1eqwrdeq  11284
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