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Theorem swrdccatin2 13734
 Description: The subword of a concatenation of two words within the second of the concatenated words. (Contributed by Alexander van der Vekens, 28-Mar-2018.) (Revised by Alexander van der Vekens, 27-May-2018.)
Hypothesis
Ref Expression
swrdccatin2.l 𝐿 = (♯‘𝐴)
Assertion
Ref Expression
swrdccatin2 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → ((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) = (𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩)))

Proof of Theorem swrdccatin2
Dummy variable 𝑘 is distinct from all other variables.
StepHypRef Expression
1 swrdccatin2.l . . . . . . . 8 𝐿 = (♯‘𝐴)
2 oveq1 6849 . . . . . . . . . 10 (𝐿 = (♯‘𝐴) → (𝐿...𝑁) = ((♯‘𝐴)...𝑁))
32eleq2d 2830 . . . . . . . . 9 (𝐿 = (♯‘𝐴) → (𝑀 ∈ (𝐿...𝑁) ↔ 𝑀 ∈ ((♯‘𝐴)...𝑁)))
4 id 22 . . . . . . . . . . 11 (𝐿 = (♯‘𝐴) → 𝐿 = (♯‘𝐴))
5 oveq1 6849 . . . . . . . . . . 11 (𝐿 = (♯‘𝐴) → (𝐿 + (♯‘𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
64, 5oveq12d 6860 . . . . . . . . . 10 (𝐿 = (♯‘𝐴) → (𝐿...(𝐿 + (♯‘𝐵))) = ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))))
76eleq2d 2830 . . . . . . . . 9 (𝐿 = (♯‘𝐴) → (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) ↔ 𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵)))))
83, 7anbi12d 624 . . . . . . . 8 (𝐿 = (♯‘𝐴) → ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) ↔ (𝑀 ∈ ((♯‘𝐴)...𝑁) ∧ 𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))))))
91, 8ax-mp 5 . . . . . . 7 ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) ↔ (𝑀 ∈ ((♯‘𝐴)...𝑁) ∧ 𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵)))))
10 lencl 13505 . . . . . . . . 9 (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ ℕ0)
11 elnn0uz 11925 . . . . . . . . . . . . 13 ((♯‘𝐴) ∈ ℕ0 ↔ (♯‘𝐴) ∈ (ℤ‘0))
1211biimpi 207 . . . . . . . . . . . 12 ((♯‘𝐴) ∈ ℕ0 → (♯‘𝐴) ∈ (ℤ‘0))
13 fzss1 12587 . . . . . . . . . . . 12 ((♯‘𝐴) ∈ (ℤ‘0) → ((♯‘𝐴)...𝑁) ⊆ (0...𝑁))
1412, 13syl 17 . . . . . . . . . . 11 ((♯‘𝐴) ∈ ℕ0 → ((♯‘𝐴)...𝑁) ⊆ (0...𝑁))
1514sseld 3760 . . . . . . . . . 10 ((♯‘𝐴) ∈ ℕ0 → (𝑀 ∈ ((♯‘𝐴)...𝑁) → 𝑀 ∈ (0...𝑁)))
16 fzss1 12587 . . . . . . . . . . . 12 ((♯‘𝐴) ∈ (ℤ‘0) → ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) ⊆ (0...((♯‘𝐴) + (♯‘𝐵))))
1712, 16syl 17 . . . . . . . . . . 11 ((♯‘𝐴) ∈ ℕ0 → ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) ⊆ (0...((♯‘𝐴) + (♯‘𝐵))))
1817sseld 3760 . . . . . . . . . 10 ((♯‘𝐴) ∈ ℕ0 → (𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) → 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵)))))
1915, 18anim12d 602 . . . . . . . . 9 ((♯‘𝐴) ∈ ℕ0 → ((𝑀 ∈ ((♯‘𝐴)...𝑁) ∧ 𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵)))) → (𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵))))))
2010, 19syl 17 . . . . . . . 8 (𝐴 ∈ Word 𝑉 → ((𝑀 ∈ ((♯‘𝐴)...𝑁) ∧ 𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵)))) → (𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵))))))
2120adantr 472 . . . . . . 7 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((𝑀 ∈ ((♯‘𝐴)...𝑁) ∧ 𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵)))) → (𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵))))))
229, 21syl5bi 233 . . . . . 6 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → (𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵))))))
2322imp 395 . . . . 5 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵)))))
24 swrdccatfn 13728 . . . . 5 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵))))) → ((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) Fn (0..^(𝑁𝑀)))
2523, 24syldan 585 . . . 4 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → ((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) Fn (0..^(𝑁𝑀)))
26 elfz2 12540 . . . . . . . . . 10 (𝑀 ∈ (𝐿...𝑁) ↔ ((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ (𝐿𝑀𝑀𝑁)))
27 zcn 11629 . . . . . . . . . . . . 13 (𝑁 ∈ ℤ → 𝑁 ∈ ℂ)
28 zcn 11629 . . . . . . . . . . . . 13 (𝑀 ∈ ℤ → 𝑀 ∈ ℂ)
29 zcn 11629 . . . . . . . . . . . . 13 (𝐿 ∈ ℤ → 𝐿 ∈ ℂ)
3027, 28, 293anim123i 1190 . . . . . . . . . . . 12 ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝐿 ∈ ℤ) → (𝑁 ∈ ℂ ∧ 𝑀 ∈ ℂ ∧ 𝐿 ∈ ℂ))
31303comr 1155 . . . . . . . . . . 11 ((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑁 ∈ ℂ ∧ 𝑀 ∈ ℂ ∧ 𝐿 ∈ ℂ))
3231adantr 472 . . . . . . . . . 10 (((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ (𝐿𝑀𝑀𝑁)) → (𝑁 ∈ ℂ ∧ 𝑀 ∈ ℂ ∧ 𝐿 ∈ ℂ))
3326, 32sylbi 208 . . . . . . . . 9 (𝑀 ∈ (𝐿...𝑁) → (𝑁 ∈ ℂ ∧ 𝑀 ∈ ℂ ∧ 𝐿 ∈ ℂ))
3433adantr 472 . . . . . . . 8 ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → (𝑁 ∈ ℂ ∧ 𝑀 ∈ ℂ ∧ 𝐿 ∈ ℂ))
35 nnncan2 10572 . . . . . . . 8 ((𝑁 ∈ ℂ ∧ 𝑀 ∈ ℂ ∧ 𝐿 ∈ ℂ) → ((𝑁𝐿) − (𝑀𝐿)) = (𝑁𝑀))
3634, 35syl 17 . . . . . . 7 ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → ((𝑁𝐿) − (𝑀𝐿)) = (𝑁𝑀))
3736adantl 473 . . . . . 6 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → ((𝑁𝐿) − (𝑀𝐿)) = (𝑁𝑀))
3837oveq2d 6858 . . . . 5 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (0..^((𝑁𝐿) − (𝑀𝐿))) = (0..^(𝑁𝑀)))
3938fneq2d 6160 . . . 4 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) Fn (0..^((𝑁𝐿) − (𝑀𝐿))) ↔ ((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) Fn (0..^(𝑁𝑀))))
4025, 39mpbird 248 . . 3 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → ((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) Fn (0..^((𝑁𝐿) − (𝑀𝐿))))
41 simpr 477 . . . . 5 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → 𝐵 ∈ Word 𝑉)
4241adantr 472 . . . 4 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → 𝐵 ∈ Word 𝑉)
43 elfzmlbm 12657 . . . . 5 (𝑀 ∈ (𝐿...𝑁) → (𝑀𝐿) ∈ (0...(𝑁𝐿)))
4443ad2antrl 719 . . . 4 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑀𝐿) ∈ (0...(𝑁𝐿)))
45 elfzmlbp 12658 . . . . . . . 8 (((♯‘𝐵) ∈ ℤ ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → (𝑁𝐿) ∈ (0...(♯‘𝐵)))
4645ex 401 . . . . . . 7 ((♯‘𝐵) ∈ ℤ → (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) → (𝑁𝐿) ∈ (0...(♯‘𝐵))))
47 lencl 13505 . . . . . . . . 9 (𝐵 ∈ Word 𝑉 → (♯‘𝐵) ∈ ℕ0)
4847nn0zd 11727 . . . . . . . 8 (𝐵 ∈ Word 𝑉 → (♯‘𝐵) ∈ ℤ)
4948adantl 473 . . . . . . 7 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (♯‘𝐵) ∈ ℤ)
5046, 49syl11 33 . . . . . 6 (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑁𝐿) ∈ (0...(♯‘𝐵))))
5150adantl 473 . . . . 5 ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑁𝐿) ∈ (0...(♯‘𝐵))))
5251impcom 396 . . . 4 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑁𝐿) ∈ (0...(♯‘𝐵)))
53 swrdvalfn 13628 . . . 4 ((𝐵 ∈ Word 𝑉 ∧ (𝑀𝐿) ∈ (0...(𝑁𝐿)) ∧ (𝑁𝐿) ∈ (0...(♯‘𝐵))) → (𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩) Fn (0..^((𝑁𝐿) − (𝑀𝐿))))
5442, 44, 52, 53syl3anc 1490 . . 3 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩) Fn (0..^((𝑁𝐿) − (𝑀𝐿))))
55 simpl 474 . . . . . . . 8 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉))
5655adantr 472 . . . . . . 7 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → (𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉))
57 elfzoelz 12678 . . . . . . . . 9 (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) → 𝑘 ∈ ℤ)
58 elfzelz 12549 . . . . . . . . . . 11 (𝑀 ∈ (𝐿...𝑁) → 𝑀 ∈ ℤ)
59 zaddcl 11664 . . . . . . . . . . . 12 ((𝑘 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑘 + 𝑀) ∈ ℤ)
6059expcom 402 . . . . . . . . . . 11 (𝑀 ∈ ℤ → (𝑘 ∈ ℤ → (𝑘 + 𝑀) ∈ ℤ))
6158, 60syl 17 . . . . . . . . . 10 (𝑀 ∈ (𝐿...𝑁) → (𝑘 ∈ ℤ → (𝑘 + 𝑀) ∈ ℤ))
6261ad2antrl 719 . . . . . . . . 9 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑘 ∈ ℤ → (𝑘 + 𝑀) ∈ ℤ))
6357, 62syl5com 31 . . . . . . . 8 (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) → (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑘 + 𝑀) ∈ ℤ))
6463impcom 396 . . . . . . 7 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → (𝑘 + 𝑀) ∈ ℤ)
65 df-3an 1109 . . . . . . 7 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉 ∧ (𝑘 + 𝑀) ∈ ℤ) ↔ ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑘 + 𝑀) ∈ ℤ))
6656, 64, 65sylanbrc 578 . . . . . 6 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → (𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉 ∧ (𝑘 + 𝑀) ∈ ℤ))
67 ccatsymb 13553 . . . . . 6 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉 ∧ (𝑘 + 𝑀) ∈ ℤ) → ((𝐴 ++ 𝐵)‘(𝑘 + 𝑀)) = if((𝑘 + 𝑀) < (♯‘𝐴), (𝐴‘(𝑘 + 𝑀)), (𝐵‘((𝑘 + 𝑀) − (♯‘𝐴)))))
6866, 67syl 17 . . . . 5 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → ((𝐴 ++ 𝐵)‘(𝑘 + 𝑀)) = if((𝑘 + 𝑀) < (♯‘𝐴), (𝐴‘(𝑘 + 𝑀)), (𝐵‘((𝑘 + 𝑀) − (♯‘𝐴)))))
69 elfzonn0 12721 . . . . . . . 8 (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) → 𝑘 ∈ ℕ0)
70 zre 11628 . . . . . . . . . . . . . . . . . . 19 (𝐿 ∈ ℤ → 𝐿 ∈ ℝ)
71 zre 11628 . . . . . . . . . . . . . . . . . . 19 (𝑀 ∈ ℤ → 𝑀 ∈ ℝ)
7270, 71anim12i 606 . . . . . . . . . . . . . . . . . 18 ((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ))
73 elnn0z 11637 . . . . . . . . . . . . . . . . . . 19 (𝑘 ∈ ℕ0 ↔ (𝑘 ∈ ℤ ∧ 0 ≤ 𝑘))
74 zre 11628 . . . . . . . . . . . . . . . . . . . 20 (𝑘 ∈ ℤ → 𝑘 ∈ ℝ)
75 0red 10297 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑀 ∈ ℝ → 0 ∈ ℝ)
7675anim1i 608 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝑀 ∈ ℝ ∧ 𝐿 ∈ ℝ) → (0 ∈ ℝ ∧ 𝐿 ∈ ℝ))
7776ancoms 450 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ) → (0 ∈ ℝ ∧ 𝐿 ∈ ℝ))
7877adantl 473 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → (0 ∈ ℝ ∧ 𝐿 ∈ ℝ))
79 simpr 477 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ) → 𝑀 ∈ ℝ)
8079anim2i 610 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → (𝑘 ∈ ℝ ∧ 𝑀 ∈ ℝ))
81 le2add 10764 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((0 ∈ ℝ ∧ 𝐿 ∈ ℝ) ∧ (𝑘 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → ((0 ≤ 𝑘𝐿𝑀) → (0 + 𝐿) ≤ (𝑘 + 𝑀)))
8278, 80, 81syl2anc 579 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → ((0 ≤ 𝑘𝐿𝑀) → (0 + 𝐿) ≤ (𝑘 + 𝑀)))
83 recn 10279 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝐿 ∈ ℝ → 𝐿 ∈ ℂ)
8483addid2d 10491 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝐿 ∈ ℝ → (0 + 𝐿) = 𝐿)
8584ad2antrl 719 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → (0 + 𝐿) = 𝐿)
8685breq1d 4819 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → ((0 + 𝐿) ≤ (𝑘 + 𝑀) ↔ 𝐿 ≤ (𝑘 + 𝑀)))
8782, 86sylibd 230 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → ((0 ≤ 𝑘𝐿𝑀) → 𝐿 ≤ (𝑘 + 𝑀)))
88 simpl 474 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ) → 𝐿 ∈ ℝ)
8988adantl 473 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → 𝐿 ∈ ℝ)
90 readdcl 10272 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑘 ∈ ℝ ∧ 𝑀 ∈ ℝ) → (𝑘 + 𝑀) ∈ ℝ)
9180, 90syl 17 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → (𝑘 + 𝑀) ∈ ℝ)
9289, 91lenltd 10437 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → (𝐿 ≤ (𝑘 + 𝑀) ↔ ¬ (𝑘 + 𝑀) < 𝐿))
9387, 92sylibd 230 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → ((0 ≤ 𝑘𝐿𝑀) → ¬ (𝑘 + 𝑀) < 𝐿))
9493expd 404 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → (0 ≤ 𝑘 → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < 𝐿)))
9594com12 32 . . . . . . . . . . . . . . . . . . . . 21 (0 ≤ 𝑘 → ((𝑘 ∈ ℝ ∧ (𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ)) → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < 𝐿)))
9695expd 404 . . . . . . . . . . . . . . . . . . . 20 (0 ≤ 𝑘 → (𝑘 ∈ ℝ → ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ) → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < 𝐿))))
9774, 96mpan9 502 . . . . . . . . . . . . . . . . . . 19 ((𝑘 ∈ ℤ ∧ 0 ≤ 𝑘) → ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ) → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < 𝐿)))
9873, 97sylbi 208 . . . . . . . . . . . . . . . . . 18 (𝑘 ∈ ℕ0 → ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℝ) → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < 𝐿)))
9972, 98mpan9 502 . . . . . . . . . . . . . . . . 17 (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℕ0) → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < 𝐿))
1001eqcomi 2774 . . . . . . . . . . . . . . . . . . 19 (♯‘𝐴) = 𝐿
101100breq2i 4817 . . . . . . . . . . . . . . . . . 18 ((𝑘 + 𝑀) < (♯‘𝐴) ↔ (𝑘 + 𝑀) < 𝐿)
102101notbii 311 . . . . . . . . . . . . . . . . 17 (¬ (𝑘 + 𝑀) < (♯‘𝐴) ↔ ¬ (𝑘 + 𝑀) < 𝐿)
10399, 102syl6ibr 243 . . . . . . . . . . . . . . . 16 (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℕ0) → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < (♯‘𝐴)))
104103ex 401 . . . . . . . . . . . . . . 15 ((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ ℕ0 → (𝐿𝑀 → ¬ (𝑘 + 𝑀) < (♯‘𝐴))))
105104com23 86 . . . . . . . . . . . . . 14 ((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝐿𝑀 → (𝑘 ∈ ℕ0 → ¬ (𝑘 + 𝑀) < (♯‘𝐴))))
1061053adant2 1161 . . . . . . . . . . . . 13 ((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝐿𝑀 → (𝑘 ∈ ℕ0 → ¬ (𝑘 + 𝑀) < (♯‘𝐴))))
107106com12 32 . . . . . . . . . . . 12 (𝐿𝑀 → ((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ ℕ0 → ¬ (𝑘 + 𝑀) < (♯‘𝐴))))
108107adantr 472 . . . . . . . . . . 11 ((𝐿𝑀𝑀𝑁) → ((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ ℕ0 → ¬ (𝑘 + 𝑀) < (♯‘𝐴))))
109108impcom 396 . . . . . . . . . 10 (((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ (𝐿𝑀𝑀𝑁)) → (𝑘 ∈ ℕ0 → ¬ (𝑘 + 𝑀) < (♯‘𝐴)))
11026, 109sylbi 208 . . . . . . . . 9 (𝑀 ∈ (𝐿...𝑁) → (𝑘 ∈ ℕ0 → ¬ (𝑘 + 𝑀) < (♯‘𝐴)))
111110ad2antrl 719 . . . . . . . 8 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑘 ∈ ℕ0 → ¬ (𝑘 + 𝑀) < (♯‘𝐴)))
11269, 111syl5com 31 . . . . . . 7 (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) → (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → ¬ (𝑘 + 𝑀) < (♯‘𝐴)))
113112impcom 396 . . . . . 6 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → ¬ (𝑘 + 𝑀) < (♯‘𝐴))
114113iffalsed 4254 . . . . 5 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → if((𝑘 + 𝑀) < (♯‘𝐴), (𝐴‘(𝑘 + 𝑀)), (𝐵‘((𝑘 + 𝑀) − (♯‘𝐴)))) = (𝐵‘((𝑘 + 𝑀) − (♯‘𝐴))))
115 zcn 11629 . . . . . . . . . . . . . . . . 17 (𝑘 ∈ ℤ → 𝑘 ∈ ℂ)
116115adantl 473 . . . . . . . . . . . . . . . 16 (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℤ) → 𝑘 ∈ ℂ)
11728adantl 473 . . . . . . . . . . . . . . . . 17 ((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) → 𝑀 ∈ ℂ)
118117adantr 472 . . . . . . . . . . . . . . . 16 (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℤ) → 𝑀 ∈ ℂ)
11929ad2antrr 717 . . . . . . . . . . . . . . . 16 (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℤ) → 𝐿 ∈ ℂ)
120116, 118, 119addsubassd 10666 . . . . . . . . . . . . . . 15 (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℤ) → ((𝑘 + 𝑀) − 𝐿) = (𝑘 + (𝑀𝐿)))
121 oveq2 6850 . . . . . . . . . . . . . . . 16 (𝐿 = (♯‘𝐴) → ((𝑘 + 𝑀) − 𝐿) = ((𝑘 + 𝑀) − (♯‘𝐴)))
122121eqeq1d 2767 . . . . . . . . . . . . . . 15 (𝐿 = (♯‘𝐴) → (((𝑘 + 𝑀) − 𝐿) = (𝑘 + (𝑀𝐿)) ↔ ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
123120, 122syl5ib 235 . . . . . . . . . . . . . 14 (𝐿 = (♯‘𝐴) → (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℤ) → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
1241, 123ax-mp 5 . . . . . . . . . . . . 13 (((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ 𝑘 ∈ ℤ) → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿)))
125124ex 401 . . . . . . . . . . . 12 ((𝐿 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ ℤ → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
1261253adant2 1161 . . . . . . . . . . 11 ((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ ℤ → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
127126adantr 472 . . . . . . . . . 10 (((𝐿 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ (𝐿𝑀𝑀𝑁)) → (𝑘 ∈ ℤ → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
12826, 127sylbi 208 . . . . . . . . 9 (𝑀 ∈ (𝐿...𝑁) → (𝑘 ∈ ℤ → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
129128ad2antrl 719 . . . . . . . 8 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑘 ∈ ℤ → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
13057, 129syl5com 31 . . . . . . 7 (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) → (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿))))
131130impcom 396 . . . . . 6 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → ((𝑘 + 𝑀) − (♯‘𝐴)) = (𝑘 + (𝑀𝐿)))
132131fveq2d 6379 . . . . 5 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → (𝐵‘((𝑘 + 𝑀) − (♯‘𝐴))) = (𝐵‘(𝑘 + (𝑀𝐿))))
13368, 114, 1323eqtrd 2803 . . . 4 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → ((𝐴 ++ 𝐵)‘(𝑘 + 𝑀)) = (𝐵‘(𝑘 + (𝑀𝐿))))
134 ccatcl 13545 . . . . . 6 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝐴 ++ 𝐵) ∈ Word 𝑉)
135134ad2antrr 717 . . . . 5 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → (𝐴 ++ 𝐵) ∈ Word 𝑉)
1361, 12syl5eqel 2848 . . . . . . . . . . . 12 ((♯‘𝐴) ∈ ℕ0𝐿 ∈ (ℤ‘0))
137 fzss1 12587 . . . . . . . . . . . 12 (𝐿 ∈ (ℤ‘0) → (𝐿...𝑁) ⊆ (0...𝑁))
13810, 136, 1373syl 18 . . . . . . . . . . 11 (𝐴 ∈ Word 𝑉 → (𝐿...𝑁) ⊆ (0...𝑁))
139138sseld 3760 . . . . . . . . . 10 (𝐴 ∈ Word 𝑉 → (𝑀 ∈ (𝐿...𝑁) → 𝑀 ∈ (0...𝑁)))
140139adantr 472 . . . . . . . . 9 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑀 ∈ (𝐿...𝑁) → 𝑀 ∈ (0...𝑁)))
141140com12 32 . . . . . . . 8 (𝑀 ∈ (𝐿...𝑁) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → 𝑀 ∈ (0...𝑁)))
142141adantr 472 . . . . . . 7 ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → 𝑀 ∈ (0...𝑁)))
143142impcom 396 . . . . . 6 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → 𝑀 ∈ (0...𝑁))
144143adantr 472 . . . . 5 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → 𝑀 ∈ (0...𝑁))
1451, 7ax-mp 5 . . . . . . . . 9 (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) ↔ 𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))))
14610, 12syl 17 . . . . . . . . . . . . . . 15 (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ (ℤ‘0))
147146adantr 472 . . . . . . . . . . . . . 14 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (♯‘𝐴) ∈ (ℤ‘0))
148147, 16syl 17 . . . . . . . . . . . . 13 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) ⊆ (0...((♯‘𝐴) + (♯‘𝐵))))
149148sseld 3760 . . . . . . . . . . . 12 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) → 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵)))))
150149impcom 396 . . . . . . . . . . 11 ((𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) ∧ (𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉)) → 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵))))
151 ccatlen 13546 . . . . . . . . . . . . . 14 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (♯‘(𝐴 ++ 𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
152151oveq2d 6858 . . . . . . . . . . . . 13 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (0...(♯‘(𝐴 ++ 𝐵))) = (0...((♯‘𝐴) + (♯‘𝐵))))
153152eleq2d 2830 . . . . . . . . . . . 12 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵))) ↔ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵)))))
154153adantl 473 . . . . . . . . . . 11 ((𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) ∧ (𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉)) → (𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵))) ↔ 𝑁 ∈ (0...((♯‘𝐴) + (♯‘𝐵)))))
155150, 154mpbird 248 . . . . . . . . . 10 ((𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) ∧ (𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉)) → 𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵))))
156155ex 401 . . . . . . . . 9 (𝑁 ∈ ((♯‘𝐴)...((♯‘𝐴) + (♯‘𝐵))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → 𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵)))))
157145, 156sylbi 208 . . . . . . . 8 (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → 𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵)))))
158157adantl 473 . . . . . . 7 ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → 𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵)))))
159158impcom 396 . . . . . 6 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → 𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵))))
160159adantr 472 . . . . 5 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → 𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵))))
161 fzmmmeqm 12581 . . . . . . . . . 10 (𝑀 ∈ (𝐿...𝑁) → ((𝑁𝐿) − (𝑀𝐿)) = (𝑁𝑀))
162161oveq2d 6858 . . . . . . . . 9 (𝑀 ∈ (𝐿...𝑁) → (0..^((𝑁𝐿) − (𝑀𝐿))) = (0..^(𝑁𝑀)))
163162eleq2d 2830 . . . . . . . 8 (𝑀 ∈ (𝐿...𝑁) → (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) ↔ 𝑘 ∈ (0..^(𝑁𝑀))))
164163biimpd 220 . . . . . . 7 (𝑀 ∈ (𝐿...𝑁) → (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) → 𝑘 ∈ (0..^(𝑁𝑀))))
165164ad2antrl 719 . . . . . 6 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿))) → 𝑘 ∈ (0..^(𝑁𝑀))))
166165imp 395 . . . . 5 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → 𝑘 ∈ (0..^(𝑁𝑀)))
167 swrdfv 13625 . . . . 5 ((((𝐴 ++ 𝐵) ∈ Word 𝑉𝑀 ∈ (0...𝑁) ∧ 𝑁 ∈ (0...(♯‘(𝐴 ++ 𝐵)))) ∧ 𝑘 ∈ (0..^(𝑁𝑀))) → (((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩)‘𝑘) = ((𝐴 ++ 𝐵)‘(𝑘 + 𝑀)))
168135, 144, 160, 166, 167syl31anc 1492 . . . 4 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → (((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩)‘𝑘) = ((𝐴 ++ 𝐵)‘(𝑘 + 𝑀)))
16948, 46syl 17 . . . . . . . . . 10 (𝐵 ∈ Word 𝑉 → (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) → (𝑁𝐿) ∈ (0...(♯‘𝐵))))
170169adantl 473 . . . . . . . . 9 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) → (𝑁𝐿) ∈ (0...(♯‘𝐵))))
171170com12 32 . . . . . . . 8 (𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑁𝐿) ∈ (0...(♯‘𝐵))))
172171adantl 473 . . . . . . 7 ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑁𝐿) ∈ (0...(♯‘𝐵))))
173172impcom 396 . . . . . 6 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝑁𝐿) ∈ (0...(♯‘𝐵)))
17442, 44, 1733jca 1158 . . . . 5 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → (𝐵 ∈ Word 𝑉 ∧ (𝑀𝐿) ∈ (0...(𝑁𝐿)) ∧ (𝑁𝐿) ∈ (0...(♯‘𝐵))))
175 swrdfv 13625 . . . . 5 (((𝐵 ∈ Word 𝑉 ∧ (𝑀𝐿) ∈ (0...(𝑁𝐿)) ∧ (𝑁𝐿) ∈ (0...(♯‘𝐵))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → ((𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩)‘𝑘) = (𝐵‘(𝑘 + (𝑀𝐿))))
176174, 175sylan 575 . . . 4 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → ((𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩)‘𝑘) = (𝐵‘(𝑘 + (𝑀𝐿))))
177133, 168, 1763eqtr4d 2809 . . 3 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) ∧ 𝑘 ∈ (0..^((𝑁𝐿) − (𝑀𝐿)))) → (((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩)‘𝑘) = ((𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩)‘𝑘))
17840, 54, 177eqfnfvd 6504 . 2 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵))))) → ((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) = (𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩))
179178ex 401 1 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((𝑀 ∈ (𝐿...𝑁) ∧ 𝑁 ∈ (𝐿...(𝐿 + (♯‘𝐵)))) → ((𝐴 ++ 𝐵) substr ⟨𝑀, 𝑁⟩) = (𝐵 substr ⟨(𝑀𝐿), (𝑁𝐿)⟩)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 197   ∧ wa 384   ∧ w3a 1107   = wceq 1652   ∈ wcel 2155   ⊆ wss 3732  ifcif 4243  ⟨cop 4340   class class class wbr 4809   Fn wfn 6063  ‘cfv 6068  (class class class)co 6842  ℂcc 10187  ℝcr 10188  0cc0 10189   + caddc 10192   < clt 10328   ≤ cle 10329   − cmin 10520  ℕ0cn0 11538  ℤcz 11624  ℤ≥cuz 11886  ...cfz 12533  ..^cfzo 12673  ♯chash 13321  Word cword 13486   ++ cconcat 13541   substr csubstr 13616 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-8 2157  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-rep 4930  ax-sep 4941  ax-nul 4949  ax-pow 5001  ax-pr 5062  ax-un 7147  ax-cnex 10245  ax-resscn 10246  ax-1cn 10247  ax-icn 10248  ax-addcl 10249  ax-addrcl 10250  ax-mulcl 10251  ax-mulrcl 10252  ax-mulcom 10253  ax-addass 10254  ax-mulass 10255  ax-distr 10256  ax-i2m1 10257  ax-1ne0 10258  ax-1rid 10259  ax-rnegex 10260  ax-rrecex 10261  ax-cnre 10262  ax-pre-lttri 10263  ax-pre-lttrn 10264  ax-pre-ltadd 10265  ax-pre-mulgt0 10266 This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3or 1108  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ne 2938  df-nel 3041  df-ral 3060  df-rex 3061  df-reu 3062  df-rab 3064  df-v 3352  df-sbc 3597  df-csb 3692  df-dif 3735  df-un 3737  df-in 3739  df-ss 3746  df-pss 3748  df-nul 4080  df-if 4244  df-pw 4317  df-sn 4335  df-pr 4337  df-tp 4339  df-op 4341  df-uni 4595  df-int 4634  df-iun 4678  df-br 4810  df-opab 4872  df-mpt 4889  df-tr 4912  df-id 5185  df-eprel 5190  df-po 5198  df-so 5199  df-fr 5236  df-we 5238  df-xp 5283  df-rel 5284  df-cnv 5285  df-co 5286  df-dm 5287  df-rn 5288  df-res 5289  df-ima 5290  df-pred 5865  df-ord 5911  df-on 5912  df-lim 5913  df-suc 5914  df-iota 6031  df-fun 6070  df-fn 6071  df-f 6072  df-f1 6073  df-fo 6074  df-f1o 6075  df-fv 6076  df-riota 6803  df-ov 6845  df-oprab 6846  df-mpt2 6847  df-om 7264  df-1st 7366  df-2nd 7367  df-wrecs 7610  df-recs 7672  df-rdg 7710  df-1o 7764  df-oadd 7768  df-er 7947  df-en 8161  df-dom 8162  df-sdom 8163  df-fin 8164  df-card 9016  df-pnf 10330  df-mnf 10331  df-xr 10332  df-ltxr 10333  df-le 10334  df-sub 10522  df-neg 10523  df-nn 11275  df-n0 11539  df-z 11625  df-uz 11887  df-fz 12534  df-fzo 12674  df-hash 13322  df-word 13487  df-concat 13542  df-substr 13617 This theorem is referenced by:  pfxccat3  13741  swrdccat3OLD  13742  swrdccatin2d  13757
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