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Theorem pfxsuffeqwrdeq 11345
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 11220 . . 3  |-  ( ( W  e. Word  V  /\  S  e. Word  V )  ->  ( W  =  S  <-> 
( ( `  W
)  =  ( `  S
)  /\  A. i  e.  ( 0..^ ( `  W
) ) ( W `
 i )  =  ( S `  i
) ) ) )
213adant3 1044 . 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 10460 . . . . . . . . 9  |-  ( I  e.  ( 0..^ ( `  W ) )  ->  I  e.  ( 0 ... ( `  W
) ) )
4 fzosplit 10476 . . . . . . . . 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 1047 . . . . . . 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 2737 . . . . 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 3390 . . . . 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 1021 . . . . . . . 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 10488 . . . . . . . . . 10  |-  ( I  e.  ( 0..^ ( `  W ) )  ->  I  e.  NN0 )
1514, 14jca 306 . . . . . . . . 9  |-  ( I  e.  ( 0..^ ( `  W ) )  -> 
( I  e.  NN0  /\  I  e.  NN0 )
)
16153ad2ant3 1047 . . . . . . . 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 10487 . . . . . . . . 9  |-  ( I  e.  ( 0..^ ( `  W ) )  ->  I  <_  ( `  W )
)
19183ad2ant3 1047 . . . . . . . 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 4097 . . . . . . . . 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 11343 . . . . . . 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 1278 . . . . . 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 11183 . . . . . . . . 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 1043 . . . . . . 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 9517 . . . . . . . . . 10  |-  ( W  e. Word  V  ->  ( `  W )  e.  RR )
3231leidd 8753 . . . . . . . . 9  |-  ( W  e. Word  V  ->  ( `  W )  <_  ( `  W ) )
3332adantr 276 . . . . . . . 8  |-  ( ( W  e. Word  V  /\  ( `  W )  =  ( `  S )
)  ->  ( `  W
)  <_  ( `  W
) )
34 eqle 8330 . . . . . . . . 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 1186 . . . . . 6  |-  ( ( ( W  e. Word  V  /\  S  e. Word  V  /\  I  e.  ( 0..^ ( `  W )
) )  /\  ( `  W )  =  ( `  S ) )  -> 
( ( `  W
)  <_  ( `  W
)  /\  ( `  W
)  <_  ( `  S
) ) )
38 swrdspsleq 11314 . . . . . 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 1274 . . . . 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 1005    = wceq 1398    e. wcel 2202   A.wral 2511    u. cun 3199   <.cop 3676   class class class wbr 4093   ` cfv 5333  (class class class)co 6028   RRcr 8091   0cc0 8092    <_ cle 8274   NN0cn0 9461   ...cfz 10305  ..^cfzo 10439  ♯chash 11100  Word cword 11179   substr csubstr 11292   prefix cpfx 11319
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-apti 8207  ax-pre-ltadd 8208
This theorem depends on definitions:  df-bi 117  df-dc 843  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-if 3608  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-1o 6625  df-er 6745  df-en 6953  df-dom 6954  df-fin 6955  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-fz 10306  df-fzo 10440  df-ihash 11101  df-word 11180  df-substr 11293  df-pfx 11320
This theorem is referenced by:  pfxsuff1eqwrdeq  11346
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