Step |
Hyp |
Ref |
Expression |
1 |
|
swrdcl |
|- ( S e. Word A -> ( S substr <. X , Y >. ) e. Word A ) |
2 |
1
|
adantr |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( S substr <. X , Y >. ) e. Word A ) |
3 |
|
swrdcl |
|- ( S e. Word A -> ( S substr <. Y , Z >. ) e. Word A ) |
4 |
3
|
adantr |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( S substr <. Y , Z >. ) e. Word A ) |
5 |
|
ccatcl |
|- ( ( ( S substr <. X , Y >. ) e. Word A /\ ( S substr <. Y , Z >. ) e. Word A ) -> ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) e. Word A ) |
6 |
2 4 5
|
syl2anc |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) e. Word A ) |
7 |
|
wrdfn |
|- ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) e. Word A -> ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) Fn ( 0 ..^ ( # ` ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ) ) ) |
8 |
6 7
|
syl |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) Fn ( 0 ..^ ( # ` ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ) ) ) |
9 |
|
ccatlen |
|- ( ( ( S substr <. X , Y >. ) e. Word A /\ ( S substr <. Y , Z >. ) e. Word A ) -> ( # ` ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ) = ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) ) |
10 |
2 4 9
|
syl2anc |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( # ` ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ) = ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) ) |
11 |
|
simpl |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> S e. Word A ) |
12 |
|
simpr1 |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> X e. ( 0 ... Y ) ) |
13 |
|
simpr2 |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> Y e. ( 0 ... Z ) ) |
14 |
|
simpr3 |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> Z e. ( 0 ... ( # ` S ) ) ) |
15 |
|
fzass4 |
|- ( ( Y e. ( 0 ... ( # ` S ) ) /\ Z e. ( Y ... ( # ` S ) ) ) <-> ( Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) |
16 |
15
|
biimpri |
|- ( ( Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) -> ( Y e. ( 0 ... ( # ` S ) ) /\ Z e. ( Y ... ( # ` S ) ) ) ) |
17 |
16
|
simpld |
|- ( ( Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) -> Y e. ( 0 ... ( # ` S ) ) ) |
18 |
13 14 17
|
syl2anc |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> Y e. ( 0 ... ( # ` S ) ) ) |
19 |
|
swrdlen |
|- ( ( S e. Word A /\ X e. ( 0 ... Y ) /\ Y e. ( 0 ... ( # ` S ) ) ) -> ( # ` ( S substr <. X , Y >. ) ) = ( Y - X ) ) |
20 |
11 12 18 19
|
syl3anc |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( # ` ( S substr <. X , Y >. ) ) = ( Y - X ) ) |
21 |
|
swrdlen |
|- ( ( S e. Word A /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) -> ( # ` ( S substr <. Y , Z >. ) ) = ( Z - Y ) ) |
22 |
21
|
3adant3r1 |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( # ` ( S substr <. Y , Z >. ) ) = ( Z - Y ) ) |
23 |
20 22
|
oveq12d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) = ( ( Y - X ) + ( Z - Y ) ) ) |
24 |
13
|
elfzelzd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> Y e. ZZ ) |
25 |
24
|
zcnd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> Y e. CC ) |
26 |
12
|
elfzelzd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> X e. ZZ ) |
27 |
26
|
zcnd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> X e. CC ) |
28 |
14
|
elfzelzd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> Z e. ZZ ) |
29 |
28
|
zcnd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> Z e. CC ) |
30 |
25 27 29
|
npncan3d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( Y - X ) + ( Z - Y ) ) = ( Z - X ) ) |
31 |
10 23 30
|
3eqtrd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( # ` ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ) = ( Z - X ) ) |
32 |
31
|
oveq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( 0 ..^ ( # ` ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ) ) = ( 0 ..^ ( Z - X ) ) ) |
33 |
32
|
fneq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) Fn ( 0 ..^ ( # ` ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ) ) <-> ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) Fn ( 0 ..^ ( Z - X ) ) ) ) |
34 |
8 33
|
mpbid |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) Fn ( 0 ..^ ( Z - X ) ) ) |
35 |
|
swrdcl |
|- ( S e. Word A -> ( S substr <. X , Z >. ) e. Word A ) |
36 |
35
|
adantr |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( S substr <. X , Z >. ) e. Word A ) |
37 |
|
wrdfn |
|- ( ( S substr <. X , Z >. ) e. Word A -> ( S substr <. X , Z >. ) Fn ( 0 ..^ ( # ` ( S substr <. X , Z >. ) ) ) ) |
38 |
36 37
|
syl |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( S substr <. X , Z >. ) Fn ( 0 ..^ ( # ` ( S substr <. X , Z >. ) ) ) ) |
39 |
|
fzass4 |
|- ( ( X e. ( 0 ... Z ) /\ Y e. ( X ... Z ) ) <-> ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) ) ) |
40 |
39
|
biimpri |
|- ( ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) ) -> ( X e. ( 0 ... Z ) /\ Y e. ( X ... Z ) ) ) |
41 |
40
|
simpld |
|- ( ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) ) -> X e. ( 0 ... Z ) ) |
42 |
12 13 41
|
syl2anc |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> X e. ( 0 ... Z ) ) |
43 |
|
swrdlen |
|- ( ( S e. Word A /\ X e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) -> ( # ` ( S substr <. X , Z >. ) ) = ( Z - X ) ) |
44 |
11 42 14 43
|
syl3anc |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( # ` ( S substr <. X , Z >. ) ) = ( Z - X ) ) |
45 |
44
|
oveq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( 0 ..^ ( # ` ( S substr <. X , Z >. ) ) ) = ( 0 ..^ ( Z - X ) ) ) |
46 |
45
|
fneq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( S substr <. X , Z >. ) Fn ( 0 ..^ ( # ` ( S substr <. X , Z >. ) ) ) <-> ( S substr <. X , Z >. ) Fn ( 0 ..^ ( Z - X ) ) ) ) |
47 |
38 46
|
mpbid |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( S substr <. X , Z >. ) Fn ( 0 ..^ ( Z - X ) ) ) |
48 |
24 26
|
zsubcld |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( Y - X ) e. ZZ ) |
49 |
48
|
anim1ci |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> ( x e. ( 0 ..^ ( Z - X ) ) /\ ( Y - X ) e. ZZ ) ) |
50 |
|
fzospliti |
|- ( ( x e. ( 0 ..^ ( Z - X ) ) /\ ( Y - X ) e. ZZ ) -> ( x e. ( 0 ..^ ( Y - X ) ) \/ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) ) |
51 |
49 50
|
syl |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> ( x e. ( 0 ..^ ( Y - X ) ) \/ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) ) |
52 |
1
|
ad2antrr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> ( S substr <. X , Y >. ) e. Word A ) |
53 |
3
|
ad2antrr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> ( S substr <. Y , Z >. ) e. Word A ) |
54 |
20
|
oveq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( 0 ..^ ( # ` ( S substr <. X , Y >. ) ) ) = ( 0 ..^ ( Y - X ) ) ) |
55 |
54
|
eleq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( x e. ( 0 ..^ ( # ` ( S substr <. X , Y >. ) ) ) <-> x e. ( 0 ..^ ( Y - X ) ) ) ) |
56 |
55
|
biimpar |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> x e. ( 0 ..^ ( # ` ( S substr <. X , Y >. ) ) ) ) |
57 |
|
ccatval1 |
|- ( ( ( S substr <. X , Y >. ) e. Word A /\ ( S substr <. Y , Z >. ) e. Word A /\ x e. ( 0 ..^ ( # ` ( S substr <. X , Y >. ) ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( ( S substr <. X , Y >. ) ` x ) ) |
58 |
52 53 56 57
|
syl3anc |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( ( S substr <. X , Y >. ) ` x ) ) |
59 |
|
simpll |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> S e. Word A ) |
60 |
|
simplr1 |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> X e. ( 0 ... Y ) ) |
61 |
18
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> Y e. ( 0 ... ( # ` S ) ) ) |
62 |
|
simpr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> x e. ( 0 ..^ ( Y - X ) ) ) |
63 |
|
swrdfv |
|- ( ( ( S e. Word A /\ X e. ( 0 ... Y ) /\ Y e. ( 0 ... ( # ` S ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> ( ( S substr <. X , Y >. ) ` x ) = ( S ` ( x + X ) ) ) |
64 |
59 60 61 62 63
|
syl31anc |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> ( ( S substr <. X , Y >. ) ` x ) = ( S ` ( x + X ) ) ) |
65 |
58 64
|
eqtrd |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Y - X ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( S ` ( x + X ) ) ) |
66 |
1
|
ad2antrr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( S substr <. X , Y >. ) e. Word A ) |
67 |
3
|
ad2antrr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( S substr <. Y , Z >. ) e. Word A ) |
68 |
23 30
|
eqtrd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) = ( Z - X ) ) |
69 |
20 68
|
oveq12d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( # ` ( S substr <. X , Y >. ) ) ..^ ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) ) = ( ( Y - X ) ..^ ( Z - X ) ) ) |
70 |
69
|
eleq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( x e. ( ( # ` ( S substr <. X , Y >. ) ) ..^ ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) ) <-> x e. ( ( Y - X ) ..^ ( Z - X ) ) ) ) |
71 |
70
|
biimpar |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> x e. ( ( # ` ( S substr <. X , Y >. ) ) ..^ ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) ) ) |
72 |
|
ccatval2 |
|- ( ( ( S substr <. X , Y >. ) e. Word A /\ ( S substr <. Y , Z >. ) e. Word A /\ x e. ( ( # ` ( S substr <. X , Y >. ) ) ..^ ( ( # ` ( S substr <. X , Y >. ) ) + ( # ` ( S substr <. Y , Z >. ) ) ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( ( S substr <. Y , Z >. ) ` ( x - ( # ` ( S substr <. X , Y >. ) ) ) ) ) |
73 |
66 67 71 72
|
syl3anc |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( ( S substr <. Y , Z >. ) ` ( x - ( # ` ( S substr <. X , Y >. ) ) ) ) ) |
74 |
|
simpll |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> S e. Word A ) |
75 |
|
simplr2 |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> Y e. ( 0 ... Z ) ) |
76 |
|
simplr3 |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> Z e. ( 0 ... ( # ` S ) ) ) |
77 |
20
|
oveq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( x - ( # ` ( S substr <. X , Y >. ) ) ) = ( x - ( Y - X ) ) ) |
78 |
77
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( x - ( # ` ( S substr <. X , Y >. ) ) ) = ( x - ( Y - X ) ) ) |
79 |
30
|
oveq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( Y - X ) ..^ ( ( Y - X ) + ( Z - Y ) ) ) = ( ( Y - X ) ..^ ( Z - X ) ) ) |
80 |
79
|
eleq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( x e. ( ( Y - X ) ..^ ( ( Y - X ) + ( Z - Y ) ) ) <-> x e. ( ( Y - X ) ..^ ( Z - X ) ) ) ) |
81 |
80
|
biimpar |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> x e. ( ( Y - X ) ..^ ( ( Y - X ) + ( Z - Y ) ) ) ) |
82 |
28 24
|
zsubcld |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( Z - Y ) e. ZZ ) |
83 |
82
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( Z - Y ) e. ZZ ) |
84 |
|
fzosubel3 |
|- ( ( x e. ( ( Y - X ) ..^ ( ( Y - X ) + ( Z - Y ) ) ) /\ ( Z - Y ) e. ZZ ) -> ( x - ( Y - X ) ) e. ( 0 ..^ ( Z - Y ) ) ) |
85 |
81 83 84
|
syl2anc |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( x - ( Y - X ) ) e. ( 0 ..^ ( Z - Y ) ) ) |
86 |
78 85
|
eqeltrd |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( x - ( # ` ( S substr <. X , Y >. ) ) ) e. ( 0 ..^ ( Z - Y ) ) ) |
87 |
|
swrdfv |
|- ( ( ( S e. Word A /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) /\ ( x - ( # ` ( S substr <. X , Y >. ) ) ) e. ( 0 ..^ ( Z - Y ) ) ) -> ( ( S substr <. Y , Z >. ) ` ( x - ( # ` ( S substr <. X , Y >. ) ) ) ) = ( S ` ( ( x - ( # ` ( S substr <. X , Y >. ) ) ) + Y ) ) ) |
88 |
74 75 76 86 87
|
syl31anc |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( ( S substr <. Y , Z >. ) ` ( x - ( # ` ( S substr <. X , Y >. ) ) ) ) = ( S ` ( ( x - ( # ` ( S substr <. X , Y >. ) ) ) + Y ) ) ) |
89 |
77
|
oveq1d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( x - ( # ` ( S substr <. X , Y >. ) ) ) + Y ) = ( ( x - ( Y - X ) ) + Y ) ) |
90 |
89
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( ( x - ( # ` ( S substr <. X , Y >. ) ) ) + Y ) = ( ( x - ( Y - X ) ) + Y ) ) |
91 |
|
elfzoelz |
|- ( x e. ( ( Y - X ) ..^ ( Z - X ) ) -> x e. ZZ ) |
92 |
91
|
zcnd |
|- ( x e. ( ( Y - X ) ..^ ( Z - X ) ) -> x e. CC ) |
93 |
92
|
adantl |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> x e. CC ) |
94 |
25 27
|
subcld |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( Y - X ) e. CC ) |
95 |
94
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( Y - X ) e. CC ) |
96 |
25
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> Y e. CC ) |
97 |
93 95 96
|
subadd23d |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( ( x - ( Y - X ) ) + Y ) = ( x + ( Y - ( Y - X ) ) ) ) |
98 |
25 27
|
nncand |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( Y - ( Y - X ) ) = X ) |
99 |
98
|
oveq2d |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( x + ( Y - ( Y - X ) ) ) = ( x + X ) ) |
100 |
99
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( x + ( Y - ( Y - X ) ) ) = ( x + X ) ) |
101 |
90 97 100
|
3eqtrd |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( ( x - ( # ` ( S substr <. X , Y >. ) ) ) + Y ) = ( x + X ) ) |
102 |
101
|
fveq2d |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( S ` ( ( x - ( # ` ( S substr <. X , Y >. ) ) ) + Y ) ) = ( S ` ( x + X ) ) ) |
103 |
73 88 102
|
3eqtrd |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( S ` ( x + X ) ) ) |
104 |
65 103
|
jaodan |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ ( x e. ( 0 ..^ ( Y - X ) ) \/ x e. ( ( Y - X ) ..^ ( Z - X ) ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( S ` ( x + X ) ) ) |
105 |
51 104
|
syldan |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( S ` ( x + X ) ) ) |
106 |
|
simpll |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> S e. Word A ) |
107 |
42
|
adantr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> X e. ( 0 ... Z ) ) |
108 |
|
simplr3 |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> Z e. ( 0 ... ( # ` S ) ) ) |
109 |
|
simpr |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> x e. ( 0 ..^ ( Z - X ) ) ) |
110 |
|
swrdfv |
|- ( ( ( S e. Word A /\ X e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> ( ( S substr <. X , Z >. ) ` x ) = ( S ` ( x + X ) ) ) |
111 |
106 107 108 109 110
|
syl31anc |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> ( ( S substr <. X , Z >. ) ` x ) = ( S ` ( x + X ) ) ) |
112 |
105 111
|
eqtr4d |
|- ( ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) /\ x e. ( 0 ..^ ( Z - X ) ) ) -> ( ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) ` x ) = ( ( S substr <. X , Z >. ) ` x ) ) |
113 |
34 47 112
|
eqfnfvd |
|- ( ( S e. Word A /\ ( X e. ( 0 ... Y ) /\ Y e. ( 0 ... Z ) /\ Z e. ( 0 ... ( # ` S ) ) ) ) -> ( ( S substr <. X , Y >. ) ++ ( S substr <. Y , Z >. ) ) = ( S substr <. X , Z >. ) ) |