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Theorem swrdccat3blem 13294
Description: Lemma for swrdccat3b 13295. (Contributed by AV, 30-May-2018.)
Hypothesis
Ref Expression
swrdccatin12.l 𝐿 = (#‘𝐴)
Assertion
Ref Expression
swrdccat3blem ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ 𝑀 ∈ (0...(𝐿 + (#‘𝐵)))) ∧ (𝐿 + (#‘𝐵)) ≤ 𝐿) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩))

Proof of Theorem swrdccat3blem
StepHypRef Expression
1 lencl 13127 . . . . . . . 8 (𝐵 ∈ Word 𝑉 → (#‘𝐵) ∈ ℕ0)
2 nn0le0eq0 11170 . . . . . . . . 9 ((#‘𝐵) ∈ ℕ0 → ((#‘𝐵) ≤ 0 ↔ (#‘𝐵) = 0))
32biimpd 217 . . . . . . . 8 ((#‘𝐵) ∈ ℕ0 → ((#‘𝐵) ≤ 0 → (#‘𝐵) = 0))
41, 3syl 17 . . . . . . 7 (𝐵 ∈ Word 𝑉 → ((#‘𝐵) ≤ 0 → (#‘𝐵) = 0))
54adantl 480 . . . . . 6 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((#‘𝐵) ≤ 0 → (#‘𝐵) = 0))
6 hasheq0 12969 . . . . . . . . . . 11 (𝐵 ∈ Word 𝑉 → ((#‘𝐵) = 0 ↔ 𝐵 = ∅))
76biimpd 217 . . . . . . . . . 10 (𝐵 ∈ Word 𝑉 → ((#‘𝐵) = 0 → 𝐵 = ∅))
87adantl 480 . . . . . . . . 9 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((#‘𝐵) = 0 → 𝐵 = ∅))
98imp 443 . . . . . . . 8 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (#‘𝐵) = 0) → 𝐵 = ∅)
10 lencl 13127 . . . . . . . . . . . . . . . 16 (𝐴 ∈ Word 𝑉 → (#‘𝐴) ∈ ℕ0)
11 swrdccatin12.l . . . . . . . . . . . . . . . . . . 19 𝐿 = (#‘𝐴)
1211eqcomi 2618 . . . . . . . . . . . . . . . . . 18 (#‘𝐴) = 𝐿
1312eleq1i 2678 . . . . . . . . . . . . . . . . 17 ((#‘𝐴) ∈ ℕ0𝐿 ∈ ℕ0)
14 nn0re 11150 . . . . . . . . . . . . . . . . . 18 (𝐿 ∈ ℕ0𝐿 ∈ ℝ)
15 elfz2nn0 12257 . . . . . . . . . . . . . . . . . . 19 (𝑀 ∈ (0...(𝐿 + 0)) ↔ (𝑀 ∈ ℕ0 ∧ (𝐿 + 0) ∈ ℕ0𝑀 ≤ (𝐿 + 0)))
16 recn 9882 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝐿 ∈ ℝ → 𝐿 ∈ ℂ)
1716addid1d 10087 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝐿 ∈ ℝ → (𝐿 + 0) = 𝐿)
1817breq2d 4589 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝐿 ∈ ℝ → (𝑀 ≤ (𝐿 + 0) ↔ 𝑀𝐿))
19 nn0re 11150 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (𝑀 ∈ ℕ0𝑀 ∈ ℝ)
2019anim1i 589 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ((𝑀 ∈ ℕ0𝐿 ∈ ℝ) → (𝑀 ∈ ℝ ∧ 𝐿 ∈ ℝ))
2120ancoms 467 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℕ0) → (𝑀 ∈ ℝ ∧ 𝐿 ∈ ℝ))
22 letri3 9974 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝑀 ∈ ℝ ∧ 𝐿 ∈ ℝ) → (𝑀 = 𝐿 ↔ (𝑀𝐿𝐿𝑀)))
2321, 22syl 17 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℕ0) → (𝑀 = 𝐿 ↔ (𝑀𝐿𝐿𝑀)))
2423biimprd 236 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝐿 ∈ ℝ ∧ 𝑀 ∈ ℕ0) → ((𝑀𝐿𝐿𝑀) → 𝑀 = 𝐿))
2524exp4b 629 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝐿 ∈ ℝ → (𝑀 ∈ ℕ0 → (𝑀𝐿 → (𝐿𝑀𝑀 = 𝐿))))
2625com23 83 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝐿 ∈ ℝ → (𝑀𝐿 → (𝑀 ∈ ℕ0 → (𝐿𝑀𝑀 = 𝐿))))
2718, 26sylbid 228 . . . . . . . . . . . . . . . . . . . . . . 23 (𝐿 ∈ ℝ → (𝑀 ≤ (𝐿 + 0) → (𝑀 ∈ ℕ0 → (𝐿𝑀𝑀 = 𝐿))))
2827com3l 86 . . . . . . . . . . . . . . . . . . . . . 22 (𝑀 ≤ (𝐿 + 0) → (𝑀 ∈ ℕ0 → (𝐿 ∈ ℝ → (𝐿𝑀𝑀 = 𝐿))))
2928impcom 444 . . . . . . . . . . . . . . . . . . . . 21 ((𝑀 ∈ ℕ0𝑀 ≤ (𝐿 + 0)) → (𝐿 ∈ ℝ → (𝐿𝑀𝑀 = 𝐿)))
30293adant2 1072 . . . . . . . . . . . . . . . . . . . 20 ((𝑀 ∈ ℕ0 ∧ (𝐿 + 0) ∈ ℕ0𝑀 ≤ (𝐿 + 0)) → (𝐿 ∈ ℝ → (𝐿𝑀𝑀 = 𝐿)))
3130com12 32 . . . . . . . . . . . . . . . . . . 19 (𝐿 ∈ ℝ → ((𝑀 ∈ ℕ0 ∧ (𝐿 + 0) ∈ ℕ0𝑀 ≤ (𝐿 + 0)) → (𝐿𝑀𝑀 = 𝐿)))
3215, 31syl5bi 230 . . . . . . . . . . . . . . . . . 18 (𝐿 ∈ ℝ → (𝑀 ∈ (0...(𝐿 + 0)) → (𝐿𝑀𝑀 = 𝐿)))
3314, 32syl 17 . . . . . . . . . . . . . . . . 17 (𝐿 ∈ ℕ0 → (𝑀 ∈ (0...(𝐿 + 0)) → (𝐿𝑀𝑀 = 𝐿)))
3413, 33sylbi 205 . . . . . . . . . . . . . . . 16 ((#‘𝐴) ∈ ℕ0 → (𝑀 ∈ (0...(𝐿 + 0)) → (𝐿𝑀𝑀 = 𝐿)))
3510, 34syl 17 . . . . . . . . . . . . . . 15 (𝐴 ∈ Word 𝑉 → (𝑀 ∈ (0...(𝐿 + 0)) → (𝐿𝑀𝑀 = 𝐿)))
3635imp 443 . . . . . . . . . . . . . 14 ((𝐴 ∈ Word 𝑉𝑀 ∈ (0...(𝐿 + 0))) → (𝐿𝑀𝑀 = 𝐿))
37 elfznn0 12259 . . . . . . . . . . . . . . . 16 (𝑀 ∈ (0...(𝐿 + 0)) → 𝑀 ∈ ℕ0)
38 swrd00 13218 . . . . . . . . . . . . . . . . . . . . . 22 (∅ substr ⟨0, 0⟩) = ∅
39 swrd00 13218 . . . . . . . . . . . . . . . . . . . . . 22 (𝐴 substr ⟨𝐿, 𝐿⟩) = ∅
4038, 39eqtr4i 2634 . . . . . . . . . . . . . . . . . . . . 21 (∅ substr ⟨0, 0⟩) = (𝐴 substr ⟨𝐿, 𝐿⟩)
41 nn0cn 11151 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝐿 ∈ ℕ0𝐿 ∈ ℂ)
4241subidd 10231 . . . . . . . . . . . . . . . . . . . . . . 23 (𝐿 ∈ ℕ0 → (𝐿𝐿) = 0)
4342opeq1d 4340 . . . . . . . . . . . . . . . . . . . . . 22 (𝐿 ∈ ℕ0 → ⟨(𝐿𝐿), 0⟩ = ⟨0, 0⟩)
4443oveq2d 6542 . . . . . . . . . . . . . . . . . . . . 21 (𝐿 ∈ ℕ0 → (∅ substr ⟨(𝐿𝐿), 0⟩) = (∅ substr ⟨0, 0⟩))
4541addid1d 10087 . . . . . . . . . . . . . . . . . . . . . . 23 (𝐿 ∈ ℕ0 → (𝐿 + 0) = 𝐿)
4645opeq2d 4341 . . . . . . . . . . . . . . . . . . . . . 22 (𝐿 ∈ ℕ0 → ⟨𝐿, (𝐿 + 0)⟩ = ⟨𝐿, 𝐿⟩)
4746oveq2d 6542 . . . . . . . . . . . . . . . . . . . . 21 (𝐿 ∈ ℕ0 → (𝐴 substr ⟨𝐿, (𝐿 + 0)⟩) = (𝐴 substr ⟨𝐿, 𝐿⟩))
4840, 44, 473eqtr4a 2669 . . . . . . . . . . . . . . . . . . . 20 (𝐿 ∈ ℕ0 → (∅ substr ⟨(𝐿𝐿), 0⟩) = (𝐴 substr ⟨𝐿, (𝐿 + 0)⟩))
4948a1i 11 . . . . . . . . . . . . . . . . . . 19 (𝑀 = 𝐿 → (𝐿 ∈ ℕ0 → (∅ substr ⟨(𝐿𝐿), 0⟩) = (𝐴 substr ⟨𝐿, (𝐿 + 0)⟩)))
50 eleq1 2675 . . . . . . . . . . . . . . . . . . 19 (𝑀 = 𝐿 → (𝑀 ∈ ℕ0𝐿 ∈ ℕ0))
51 oveq1 6533 . . . . . . . . . . . . . . . . . . . . . 22 (𝑀 = 𝐿 → (𝑀𝐿) = (𝐿𝐿))
5251opeq1d 4340 . . . . . . . . . . . . . . . . . . . . 21 (𝑀 = 𝐿 → ⟨(𝑀𝐿), 0⟩ = ⟨(𝐿𝐿), 0⟩)
5352oveq2d 6542 . . . . . . . . . . . . . . . . . . . 20 (𝑀 = 𝐿 → (∅ substr ⟨(𝑀𝐿), 0⟩) = (∅ substr ⟨(𝐿𝐿), 0⟩))
54 opeq1 4334 . . . . . . . . . . . . . . . . . . . . 21 (𝑀 = 𝐿 → ⟨𝑀, (𝐿 + 0)⟩ = ⟨𝐿, (𝐿 + 0)⟩)
5554oveq2d 6542 . . . . . . . . . . . . . . . . . . . 20 (𝑀 = 𝐿 → (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩) = (𝐴 substr ⟨𝐿, (𝐿 + 0)⟩))
5653, 55eqeq12d 2624 . . . . . . . . . . . . . . . . . . 19 (𝑀 = 𝐿 → ((∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩) ↔ (∅ substr ⟨(𝐿𝐿), 0⟩) = (𝐴 substr ⟨𝐿, (𝐿 + 0)⟩)))
5749, 50, 563imtr4d 281 . . . . . . . . . . . . . . . . . 18 (𝑀 = 𝐿 → (𝑀 ∈ ℕ0 → (∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩)))
5857com12 32 . . . . . . . . . . . . . . . . 17 (𝑀 ∈ ℕ0 → (𝑀 = 𝐿 → (∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩)))
5958a1d 25 . . . . . . . . . . . . . . . 16 (𝑀 ∈ ℕ0 → (𝐴 ∈ Word 𝑉 → (𝑀 = 𝐿 → (∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))))
6037, 59syl 17 . . . . . . . . . . . . . . 15 (𝑀 ∈ (0...(𝐿 + 0)) → (𝐴 ∈ Word 𝑉 → (𝑀 = 𝐿 → (∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))))
6160impcom 444 . . . . . . . . . . . . . 14 ((𝐴 ∈ Word 𝑉𝑀 ∈ (0...(𝐿 + 0))) → (𝑀 = 𝐿 → (∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩)))
6236, 61syld 45 . . . . . . . . . . . . 13 ((𝐴 ∈ Word 𝑉𝑀 ∈ (0...(𝐿 + 0))) → (𝐿𝑀 → (∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩)))
6362imp 443 . . . . . . . . . . . 12 (((𝐴 ∈ Word 𝑉𝑀 ∈ (0...(𝐿 + 0))) ∧ 𝐿𝑀) → (∅ substr ⟨(𝑀𝐿), 0⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
64 swrdcl 13219 . . . . . . . . . . . . . . . 16 (𝐴 ∈ Word 𝑉 → (𝐴 substr ⟨𝑀, 𝐿⟩) ∈ Word 𝑉)
65 ccatrid 13171 . . . . . . . . . . . . . . . 16 ((𝐴 substr ⟨𝑀, 𝐿⟩) ∈ Word 𝑉 → ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅) = (𝐴 substr ⟨𝑀, 𝐿⟩))
6664, 65syl 17 . . . . . . . . . . . . . . 15 (𝐴 ∈ Word 𝑉 → ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅) = (𝐴 substr ⟨𝑀, 𝐿⟩))
6713, 41sylbi 205 . . . . . . . . . . . . . . . . . . 19 ((#‘𝐴) ∈ ℕ0𝐿 ∈ ℂ)
6810, 67syl 17 . . . . . . . . . . . . . . . . . 18 (𝐴 ∈ Word 𝑉𝐿 ∈ ℂ)
69 addid1 10067 . . . . . . . . . . . . . . . . . . 19 (𝐿 ∈ ℂ → (𝐿 + 0) = 𝐿)
7069eqcomd 2615 . . . . . . . . . . . . . . . . . 18 (𝐿 ∈ ℂ → 𝐿 = (𝐿 + 0))
7168, 70syl 17 . . . . . . . . . . . . . . . . 17 (𝐴 ∈ Word 𝑉𝐿 = (𝐿 + 0))
7271opeq2d 4341 . . . . . . . . . . . . . . . 16 (𝐴 ∈ Word 𝑉 → ⟨𝑀, 𝐿⟩ = ⟨𝑀, (𝐿 + 0)⟩)
7372oveq2d 6542 . . . . . . . . . . . . . . 15 (𝐴 ∈ Word 𝑉 → (𝐴 substr ⟨𝑀, 𝐿⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
7466, 73eqtrd 2643 . . . . . . . . . . . . . 14 (𝐴 ∈ Word 𝑉 → ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
7574adantr 479 . . . . . . . . . . . . 13 ((𝐴 ∈ Word 𝑉𝑀 ∈ (0...(𝐿 + 0))) → ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
7675adantr 479 . . . . . . . . . . . 12 (((𝐴 ∈ Word 𝑉𝑀 ∈ (0...(𝐿 + 0))) ∧ ¬ 𝐿𝑀) → ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
7763, 76ifeqda 4070 . . . . . . . . . . 11 ((𝐴 ∈ Word 𝑉𝑀 ∈ (0...(𝐿 + 0))) → if(𝐿𝑀, (∅ substr ⟨(𝑀𝐿), 0⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅)) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
7877ex 448 . . . . . . . . . 10 (𝐴 ∈ Word 𝑉 → (𝑀 ∈ (0...(𝐿 + 0)) → if(𝐿𝑀, (∅ substr ⟨(𝑀𝐿), 0⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅)) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩)))
7978ad3antrrr 761 . . . . . . . . 9 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (#‘𝐵) = 0) ∧ 𝐵 = ∅) → (𝑀 ∈ (0...(𝐿 + 0)) → if(𝐿𝑀, (∅ substr ⟨(𝑀𝐿), 0⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅)) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩)))
80 oveq2 6534 . . . . . . . . . . . . . 14 ((#‘𝐵) = 0 → (𝐿 + (#‘𝐵)) = (𝐿 + 0))
8180oveq2d 6542 . . . . . . . . . . . . 13 ((#‘𝐵) = 0 → (0...(𝐿 + (#‘𝐵))) = (0...(𝐿 + 0)))
8281eleq2d 2672 . . . . . . . . . . . 12 ((#‘𝐵) = 0 → (𝑀 ∈ (0...(𝐿 + (#‘𝐵))) ↔ 𝑀 ∈ (0...(𝐿 + 0))))
8382adantr 479 . . . . . . . . . . 11 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → (𝑀 ∈ (0...(𝐿 + (#‘𝐵))) ↔ 𝑀 ∈ (0...(𝐿 + 0))))
84 simpr 475 . . . . . . . . . . . . . 14 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → 𝐵 = ∅)
85 opeq2 4335 . . . . . . . . . . . . . . 15 ((#‘𝐵) = 0 → ⟨(𝑀𝐿), (#‘𝐵)⟩ = ⟨(𝑀𝐿), 0⟩)
8685adantr 479 . . . . . . . . . . . . . 14 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → ⟨(𝑀𝐿), (#‘𝐵)⟩ = ⟨(𝑀𝐿), 0⟩)
8784, 86oveq12d 6544 . . . . . . . . . . . . 13 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩) = (∅ substr ⟨(𝑀𝐿), 0⟩))
88 oveq2 6534 . . . . . . . . . . . . . 14 (𝐵 = ∅ → ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵) = ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅))
8988adantl 480 . . . . . . . . . . . . 13 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵) = ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅))
9087, 89ifeq12d 4055 . . . . . . . . . . . 12 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = if(𝐿𝑀, (∅ substr ⟨(𝑀𝐿), 0⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅)))
9180opeq2d 4341 . . . . . . . . . . . . . 14 ((#‘𝐵) = 0 → ⟨𝑀, (𝐿 + (#‘𝐵))⟩ = ⟨𝑀, (𝐿 + 0)⟩)
9291oveq2d 6542 . . . . . . . . . . . . 13 ((#‘𝐵) = 0 → (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
9392adantr 479 . . . . . . . . . . . 12 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))
9490, 93eqeq12d 2624 . . . . . . . . . . 11 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → (if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩) ↔ if(𝐿𝑀, (∅ substr ⟨(𝑀𝐿), 0⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅)) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩)))
9583, 94imbi12d 332 . . . . . . . . . 10 (((#‘𝐵) = 0 ∧ 𝐵 = ∅) → ((𝑀 ∈ (0...(𝐿 + (#‘𝐵))) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)) ↔ (𝑀 ∈ (0...(𝐿 + 0)) → if(𝐿𝑀, (∅ substr ⟨(𝑀𝐿), 0⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅)) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))))
9695adantll 745 . . . . . . . . 9 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (#‘𝐵) = 0) ∧ 𝐵 = ∅) → ((𝑀 ∈ (0...(𝐿 + (#‘𝐵))) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)) ↔ (𝑀 ∈ (0...(𝐿 + 0)) → if(𝐿𝑀, (∅ substr ⟨(𝑀𝐿), 0⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ ∅)) = (𝐴 substr ⟨𝑀, (𝐿 + 0)⟩))))
9779, 96mpbird 245 . . . . . . . 8 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (#‘𝐵) = 0) ∧ 𝐵 = ∅) → (𝑀 ∈ (0...(𝐿 + (#‘𝐵))) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)))
989, 97mpdan 698 . . . . . . 7 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ (#‘𝐵) = 0) → (𝑀 ∈ (0...(𝐿 + (#‘𝐵))) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)))
9998ex 448 . . . . . 6 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((#‘𝐵) = 0 → (𝑀 ∈ (0...(𝐿 + (#‘𝐵))) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩))))
1005, 99syld 45 . . . . 5 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((#‘𝐵) ≤ 0 → (𝑀 ∈ (0...(𝐿 + (#‘𝐵))) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩))))
101100com23 83 . . . 4 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → (𝑀 ∈ (0...(𝐿 + (#‘𝐵))) → ((#‘𝐵) ≤ 0 → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩))))
102101imp 443 . . 3 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ 𝑀 ∈ (0...(𝐿 + (#‘𝐵)))) → ((#‘𝐵) ≤ 0 → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)))
103102adantr 479 . 2 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ 𝑀 ∈ (0...(𝐿 + (#‘𝐵)))) ∧ (𝐿 + (#‘𝐵)) ≤ 𝐿) → ((#‘𝐵) ≤ 0 → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)))
10411eleq1i 2678 . . . . . . . 8 (𝐿 ∈ ℕ0 ↔ (#‘𝐴) ∈ ℕ0)
105104, 14sylbir 223 . . . . . . 7 ((#‘𝐴) ∈ ℕ0𝐿 ∈ ℝ)
10610, 105syl 17 . . . . . 6 (𝐴 ∈ Word 𝑉𝐿 ∈ ℝ)
1071nn0red 11201 . . . . . 6 (𝐵 ∈ Word 𝑉 → (#‘𝐵) ∈ ℝ)
108 leaddle0 10394 . . . . . 6 ((𝐿 ∈ ℝ ∧ (#‘𝐵) ∈ ℝ) → ((𝐿 + (#‘𝐵)) ≤ 𝐿 ↔ (#‘𝐵) ≤ 0))
109106, 107, 108syl2an 492 . . . . 5 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((𝐿 + (#‘𝐵)) ≤ 𝐿 ↔ (#‘𝐵) ≤ 0))
110 pm2.24 119 . . . . 5 ((#‘𝐵) ≤ 0 → (¬ (#‘𝐵) ≤ 0 → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)))
111109, 110syl6bi 241 . . . 4 ((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) → ((𝐿 + (#‘𝐵)) ≤ 𝐿 → (¬ (#‘𝐵) ≤ 0 → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩))))
112111adantr 479 . . 3 (((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ 𝑀 ∈ (0...(𝐿 + (#‘𝐵)))) → ((𝐿 + (#‘𝐵)) ≤ 𝐿 → (¬ (#‘𝐵) ≤ 0 → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩))))
113112imp 443 . 2 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ 𝑀 ∈ (0...(𝐿 + (#‘𝐵)))) ∧ (𝐿 + (#‘𝐵)) ≤ 𝐿) → (¬ (#‘𝐵) ≤ 0 → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩)))
114103, 113pm2.61d 168 1 ((((𝐴 ∈ Word 𝑉𝐵 ∈ Word 𝑉) ∧ 𝑀 ∈ (0...(𝐿 + (#‘𝐵)))) ∧ (𝐿 + (#‘𝐵)) ≤ 𝐿) → if(𝐿𝑀, (𝐵 substr ⟨(𝑀𝐿), (#‘𝐵)⟩), ((𝐴 substr ⟨𝑀, 𝐿⟩) ++ 𝐵)) = (𝐴 substr ⟨𝑀, (𝐿 + (#‘𝐵))⟩))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 194  wa 382  w3a 1030   = wceq 1474  wcel 1976  c0 3873  ifcif 4035  cop 4130   class class class wbr 4577  cfv 5789  (class class class)co 6526  cc 9790  cr 9791  0cc0 9792   + caddc 9795  cle 9931  cmin 10117  0cn0 11141  ...cfz 12154  #chash 12936  Word cword 13094   ++ cconcat 13096   substr csubstr 13098
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1712  ax-4 1727  ax-5 1826  ax-6 1874  ax-7 1921  ax-8 1978  ax-9 1985  ax-10 2005  ax-11 2020  ax-12 2033  ax-13 2233  ax-ext 2589  ax-rep 4693  ax-sep 4703  ax-nul 4711  ax-pow 4763  ax-pr 4827  ax-un 6824  ax-cnex 9848  ax-resscn 9849  ax-1cn 9850  ax-icn 9851  ax-addcl 9852  ax-addrcl 9853  ax-mulcl 9854  ax-mulrcl 9855  ax-mulcom 9856  ax-addass 9857  ax-mulass 9858  ax-distr 9859  ax-i2m1 9860  ax-1ne0 9861  ax-1rid 9862  ax-rnegex 9863  ax-rrecex 9864  ax-cnre 9865  ax-pre-lttri 9866  ax-pre-lttrn 9867  ax-pre-ltadd 9868  ax-pre-mulgt0 9869
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1700  df-sb 1867  df-eu 2461  df-mo 2462  df-clab 2596  df-cleq 2602  df-clel 2605  df-nfc 2739  df-ne 2781  df-nel 2782  df-ral 2900  df-rex 2901  df-reu 2902  df-rab 2904  df-v 3174  df-sbc 3402  df-csb 3499  df-dif 3542  df-un 3544  df-in 3546  df-ss 3553  df-pss 3555  df-nul 3874  df-if 4036  df-pw 4109  df-sn 4125  df-pr 4127  df-tp 4129  df-op 4131  df-uni 4367  df-int 4405  df-iun 4451  df-br 4578  df-opab 4638  df-mpt 4639  df-tr 4675  df-eprel 4938  df-id 4942  df-po 4948  df-so 4949  df-fr 4986  df-we 4988  df-xp 5033  df-rel 5034  df-cnv 5035  df-co 5036  df-dm 5037  df-rn 5038  df-res 5039  df-ima 5040  df-pred 5582  df-ord 5628  df-on 5629  df-lim 5630  df-suc 5631  df-iota 5753  df-fun 5791  df-fn 5792  df-f 5793  df-f1 5794  df-fo 5795  df-f1o 5796  df-fv 5797  df-riota 6488  df-ov 6529  df-oprab 6530  df-mpt2 6531  df-om 6935  df-1st 7036  df-2nd 7037  df-wrecs 7271  df-recs 7332  df-rdg 7370  df-1o 7424  df-oadd 7428  df-er 7606  df-en 7819  df-dom 7820  df-sdom 7821  df-fin 7822  df-card 8625  df-pnf 9932  df-mnf 9933  df-xr 9934  df-ltxr 9935  df-le 9936  df-sub 10119  df-neg 10120  df-nn 10870  df-n0 11142  df-z 11213  df-uz 11522  df-fz 12155  df-fzo 12292  df-hash 12937  df-word 13102  df-concat 13104  df-substr 13106
This theorem is referenced by:  swrdccat3b  13295
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