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Theorem seqsplit 13401
 Description: Split a sequence into two sequences. (Contributed by NM, 17-Mar-2005.) (Revised by Mario Carneiro, 27-May-2014.)
Hypotheses
Ref Expression
seqsplit.1 ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → (𝑥 + 𝑦) ∈ 𝑆)
seqsplit.2 ((𝜑 ∧ (𝑥𝑆𝑦𝑆𝑧𝑆)) → ((𝑥 + 𝑦) + 𝑧) = (𝑥 + (𝑦 + 𝑧)))
seqsplit.3 (𝜑𝑁 ∈ (ℤ‘(𝑀 + 1)))
seqsplit.4 (𝜑𝑀 ∈ (ℤ𝐾))
seqsplit.5 ((𝜑𝑥 ∈ (𝐾...𝑁)) → (𝐹𝑥) ∈ 𝑆)
Assertion
Ref Expression
seqsplit (𝜑 → (seq𝐾( + , 𝐹)‘𝑁) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁)))
Distinct variable groups:   𝑥,𝑦,𝑧,𝐹   𝑥,𝐾,𝑦,𝑧   𝑥,𝑀,𝑦,𝑧   𝜑,𝑥,𝑦,𝑧   𝑥,𝑁,𝑦,𝑧   𝑥, + ,𝑦,𝑧   𝑥,𝑆,𝑦,𝑧

Proof of Theorem seqsplit
Dummy variable 𝑛 is distinct from all other variables.
StepHypRef Expression
1 seqsplit.3 . . 3 (𝜑𝑁 ∈ (ℤ‘(𝑀 + 1)))
2 eluzfz2 12912 . . 3 (𝑁 ∈ (ℤ‘(𝑀 + 1)) → 𝑁 ∈ ((𝑀 + 1)...𝑁))
31, 2syl 17 . 2 (𝜑𝑁 ∈ ((𝑀 + 1)...𝑁))
4 eleq1 2877 . . . . . 6 (𝑥 = (𝑀 + 1) → (𝑥 ∈ ((𝑀 + 1)...𝑁) ↔ (𝑀 + 1) ∈ ((𝑀 + 1)...𝑁)))
5 fveq2 6645 . . . . . . 7 (𝑥 = (𝑀 + 1) → (seq𝐾( + , 𝐹)‘𝑥) = (seq𝐾( + , 𝐹)‘(𝑀 + 1)))
6 fveq2 6645 . . . . . . . 8 (𝑥 = (𝑀 + 1) → (seq(𝑀 + 1)( + , 𝐹)‘𝑥) = (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1)))
76oveq2d 7151 . . . . . . 7 (𝑥 = (𝑀 + 1) → ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1))))
85, 7eqeq12d 2814 . . . . . 6 (𝑥 = (𝑀 + 1) → ((seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) ↔ (seq𝐾( + , 𝐹)‘(𝑀 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1)))))
94, 8imbi12d 348 . . . . 5 (𝑥 = (𝑀 + 1) → ((𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥))) ↔ ((𝑀 + 1) ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘(𝑀 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1))))))
109imbi2d 344 . . . 4 (𝑥 = (𝑀 + 1) → ((𝜑 → (𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)))) ↔ (𝜑 → ((𝑀 + 1) ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘(𝑀 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1)))))))
11 eleq1 2877 . . . . . 6 (𝑥 = 𝑛 → (𝑥 ∈ ((𝑀 + 1)...𝑁) ↔ 𝑛 ∈ ((𝑀 + 1)...𝑁)))
12 fveq2 6645 . . . . . . 7 (𝑥 = 𝑛 → (seq𝐾( + , 𝐹)‘𝑥) = (seq𝐾( + , 𝐹)‘𝑛))
13 fveq2 6645 . . . . . . . 8 (𝑥 = 𝑛 → (seq(𝑀 + 1)( + , 𝐹)‘𝑥) = (seq(𝑀 + 1)( + , 𝐹)‘𝑛))
1413oveq2d 7151 . . . . . . 7 (𝑥 = 𝑛 → ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)))
1512, 14eqeq12d 2814 . . . . . 6 (𝑥 = 𝑛 → ((seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) ↔ (seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛))))
1611, 15imbi12d 348 . . . . 5 (𝑥 = 𝑛 → ((𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥))) ↔ (𝑛 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)))))
1716imbi2d 344 . . . 4 (𝑥 = 𝑛 → ((𝜑 → (𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)))) ↔ (𝜑 → (𝑛 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛))))))
18 eleq1 2877 . . . . . 6 (𝑥 = (𝑛 + 1) → (𝑥 ∈ ((𝑀 + 1)...𝑁) ↔ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁)))
19 fveq2 6645 . . . . . . 7 (𝑥 = (𝑛 + 1) → (seq𝐾( + , 𝐹)‘𝑥) = (seq𝐾( + , 𝐹)‘(𝑛 + 1)))
20 fveq2 6645 . . . . . . . 8 (𝑥 = (𝑛 + 1) → (seq(𝑀 + 1)( + , 𝐹)‘𝑥) = (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1)))
2120oveq2d 7151 . . . . . . 7 (𝑥 = (𝑛 + 1) → ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1))))
2219, 21eqeq12d 2814 . . . . . 6 (𝑥 = (𝑛 + 1) → ((seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) ↔ (seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1)))))
2318, 22imbi12d 348 . . . . 5 (𝑥 = (𝑛 + 1) → ((𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥))) ↔ ((𝑛 + 1) ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1))))))
2423imbi2d 344 . . . 4 (𝑥 = (𝑛 + 1) → ((𝜑 → (𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)))) ↔ (𝜑 → ((𝑛 + 1) ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1)))))))
25 eleq1 2877 . . . . . 6 (𝑥 = 𝑁 → (𝑥 ∈ ((𝑀 + 1)...𝑁) ↔ 𝑁 ∈ ((𝑀 + 1)...𝑁)))
26 fveq2 6645 . . . . . . 7 (𝑥 = 𝑁 → (seq𝐾( + , 𝐹)‘𝑥) = (seq𝐾( + , 𝐹)‘𝑁))
27 fveq2 6645 . . . . . . . 8 (𝑥 = 𝑁 → (seq(𝑀 + 1)( + , 𝐹)‘𝑥) = (seq(𝑀 + 1)( + , 𝐹)‘𝑁))
2827oveq2d 7151 . . . . . . 7 (𝑥 = 𝑁 → ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁)))
2926, 28eqeq12d 2814 . . . . . 6 (𝑥 = 𝑁 → ((seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)) ↔ (seq𝐾( + , 𝐹)‘𝑁) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁))))
3025, 29imbi12d 348 . . . . 5 (𝑥 = 𝑁 → ((𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥))) ↔ (𝑁 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑁) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁)))))
3130imbi2d 344 . . . 4 (𝑥 = 𝑁 → ((𝜑 → (𝑥 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑥) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑥)))) ↔ (𝜑 → (𝑁 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑁) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁))))))
32 seqsplit.4 . . . . . . 7 (𝜑𝑀 ∈ (ℤ𝐾))
33 seqp1 13381 . . . . . . 7 (𝑀 ∈ (ℤ𝐾) → (seq𝐾( + , 𝐹)‘(𝑀 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (𝐹‘(𝑀 + 1))))
3432, 33syl 17 . . . . . 6 (𝜑 → (seq𝐾( + , 𝐹)‘(𝑀 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (𝐹‘(𝑀 + 1))))
35 eluzel2 12238 . . . . . . . 8 (𝑁 ∈ (ℤ‘(𝑀 + 1)) → (𝑀 + 1) ∈ ℤ)
36 seq1 13379 . . . . . . . 8 ((𝑀 + 1) ∈ ℤ → (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1)) = (𝐹‘(𝑀 + 1)))
371, 35, 363syl 18 . . . . . . 7 (𝜑 → (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1)) = (𝐹‘(𝑀 + 1)))
3837oveq2d 7151 . . . . . 6 (𝜑 → ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1))) = ((seq𝐾( + , 𝐹)‘𝑀) + (𝐹‘(𝑀 + 1))))
3934, 38eqtr4d 2836 . . . . 5 (𝜑 → (seq𝐾( + , 𝐹)‘(𝑀 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1))))
4039a1i13 27 . . . 4 ((𝑀 + 1) ∈ ℤ → (𝜑 → ((𝑀 + 1) ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘(𝑀 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑀 + 1))))))
41 peano2fzr 12917 . . . . . . . 8 ((𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁)) → 𝑛 ∈ ((𝑀 + 1)...𝑁))
4241adantl 485 . . . . . . 7 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → 𝑛 ∈ ((𝑀 + 1)...𝑁))
4342expr 460 . . . . . 6 ((𝜑𝑛 ∈ (ℤ‘(𝑀 + 1))) → ((𝑛 + 1) ∈ ((𝑀 + 1)...𝑁) → 𝑛 ∈ ((𝑀 + 1)...𝑁)))
4443imim1d 82 . . . . 5 ((𝜑𝑛 ∈ (ℤ‘(𝑀 + 1))) → ((𝑛 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛))) → ((𝑛 + 1) ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)))))
45 oveq1 7142 . . . . . 6 ((seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)) → ((seq𝐾( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1))) = (((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)) + (𝐹‘(𝑛 + 1))))
46 simprl 770 . . . . . . . . 9 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → 𝑛 ∈ (ℤ‘(𝑀 + 1)))
47 peano2uz 12291 . . . . . . . . . . 11 (𝑀 ∈ (ℤ𝐾) → (𝑀 + 1) ∈ (ℤ𝐾))
4832, 47syl 17 . . . . . . . . . 10 (𝜑 → (𝑀 + 1) ∈ (ℤ𝐾))
4948adantr 484 . . . . . . . . 9 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (𝑀 + 1) ∈ (ℤ𝐾))
50 uztrn 12251 . . . . . . . . 9 ((𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑀 + 1) ∈ (ℤ𝐾)) → 𝑛 ∈ (ℤ𝐾))
5146, 49, 50syl2anc 587 . . . . . . . 8 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → 𝑛 ∈ (ℤ𝐾))
52 seqp1 13381 . . . . . . . 8 (𝑛 ∈ (ℤ𝐾) → (seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1))))
5351, 52syl 17 . . . . . . 7 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1))))
54 seqp1 13381 . . . . . . . . . 10 (𝑛 ∈ (ℤ‘(𝑀 + 1)) → (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1)) = ((seq(𝑀 + 1)( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1))))
5546, 54syl 17 . . . . . . . . 9 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1)) = ((seq(𝑀 + 1)( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1))))
5655oveq2d 7151 . . . . . . . 8 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1))) = ((seq𝐾( + , 𝐹)‘𝑀) + ((seq(𝑀 + 1)( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1)))))
57 simpl 486 . . . . . . . . 9 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → 𝜑)
58 eluzelz 12243 . . . . . . . . . . . . . . . 16 (𝑀 ∈ (ℤ𝐾) → 𝑀 ∈ ℤ)
5932, 58syl 17 . . . . . . . . . . . . . . 15 (𝜑𝑀 ∈ ℤ)
60 peano2uzr 12293 . . . . . . . . . . . . . . 15 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ (ℤ‘(𝑀 + 1))) → 𝑁 ∈ (ℤ𝑀))
6159, 1, 60syl2anc 587 . . . . . . . . . . . . . 14 (𝜑𝑁 ∈ (ℤ𝑀))
62 fzss2 12944 . . . . . . . . . . . . . 14 (𝑁 ∈ (ℤ𝑀) → (𝐾...𝑀) ⊆ (𝐾...𝑁))
6361, 62syl 17 . . . . . . . . . . . . 13 (𝜑 → (𝐾...𝑀) ⊆ (𝐾...𝑁))
6463sselda 3915 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (𝐾...𝑀)) → 𝑥 ∈ (𝐾...𝑁))
65 seqsplit.5 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (𝐾...𝑁)) → (𝐹𝑥) ∈ 𝑆)
6664, 65syldan 594 . . . . . . . . . . 11 ((𝜑𝑥 ∈ (𝐾...𝑀)) → (𝐹𝑥) ∈ 𝑆)
67 seqsplit.1 . . . . . . . . . . 11 ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → (𝑥 + 𝑦) ∈ 𝑆)
6832, 66, 67seqcl 13388 . . . . . . . . . 10 (𝜑 → (seq𝐾( + , 𝐹)‘𝑀) ∈ 𝑆)
6968adantr 484 . . . . . . . . 9 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (seq𝐾( + , 𝐹)‘𝑀) ∈ 𝑆)
70 elfzuz3 12901 . . . . . . . . . . . . . 14 (𝑛 ∈ ((𝑀 + 1)...𝑁) → 𝑁 ∈ (ℤ𝑛))
71 fzss2 12944 . . . . . . . . . . . . . 14 (𝑁 ∈ (ℤ𝑛) → ((𝑀 + 1)...𝑛) ⊆ ((𝑀 + 1)...𝑁))
7242, 70, 713syl 18 . . . . . . . . . . . . 13 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ((𝑀 + 1)...𝑛) ⊆ ((𝑀 + 1)...𝑁))
73 fzss1 12943 . . . . . . . . . . . . . . 15 ((𝑀 + 1) ∈ (ℤ𝐾) → ((𝑀 + 1)...𝑁) ⊆ (𝐾...𝑁))
7432, 47, 733syl 18 . . . . . . . . . . . . . 14 (𝜑 → ((𝑀 + 1)...𝑁) ⊆ (𝐾...𝑁))
7574adantr 484 . . . . . . . . . . . . 13 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ((𝑀 + 1)...𝑁) ⊆ (𝐾...𝑁))
7672, 75sstrd 3925 . . . . . . . . . . . 12 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ((𝑀 + 1)...𝑛) ⊆ (𝐾...𝑁))
7776sselda 3915 . . . . . . . . . . 11 (((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) ∧ 𝑥 ∈ ((𝑀 + 1)...𝑛)) → 𝑥 ∈ (𝐾...𝑁))
7865adantlr 714 . . . . . . . . . . 11 (((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) ∧ 𝑥 ∈ (𝐾...𝑁)) → (𝐹𝑥) ∈ 𝑆)
7977, 78syldan 594 . . . . . . . . . 10 (((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) ∧ 𝑥 ∈ ((𝑀 + 1)...𝑛)) → (𝐹𝑥) ∈ 𝑆)
8067adantlr 714 . . . . . . . . . 10 (((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) ∧ (𝑥𝑆𝑦𝑆)) → (𝑥 + 𝑦) ∈ 𝑆)
8146, 79, 80seqcl 13388 . . . . . . . . 9 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (seq(𝑀 + 1)( + , 𝐹)‘𝑛) ∈ 𝑆)
82 fveq2 6645 . . . . . . . . . . 11 (𝑥 = (𝑛 + 1) → (𝐹𝑥) = (𝐹‘(𝑛 + 1)))
8382eleq1d 2874 . . . . . . . . . 10 (𝑥 = (𝑛 + 1) → ((𝐹𝑥) ∈ 𝑆 ↔ (𝐹‘(𝑛 + 1)) ∈ 𝑆))
8465ralrimiva 3149 . . . . . . . . . . 11 (𝜑 → ∀𝑥 ∈ (𝐾...𝑁)(𝐹𝑥) ∈ 𝑆)
8584adantr 484 . . . . . . . . . 10 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ∀𝑥 ∈ (𝐾...𝑁)(𝐹𝑥) ∈ 𝑆)
86 simpr 488 . . . . . . . . . . 11 ((𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁)) → (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))
87 ssel2 3910 . . . . . . . . . . 11 ((((𝑀 + 1)...𝑁) ⊆ (𝐾...𝑁) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁)) → (𝑛 + 1) ∈ (𝐾...𝑁))
8874, 86, 87syl2an 598 . . . . . . . . . 10 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (𝑛 + 1) ∈ (𝐾...𝑁))
8983, 85, 88rspcdva 3573 . . . . . . . . 9 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (𝐹‘(𝑛 + 1)) ∈ 𝑆)
90 seqsplit.2 . . . . . . . . . 10 ((𝜑 ∧ (𝑥𝑆𝑦𝑆𝑧𝑆)) → ((𝑥 + 𝑦) + 𝑧) = (𝑥 + (𝑦 + 𝑧)))
9190caovassg 7327 . . . . . . . . 9 ((𝜑 ∧ ((seq𝐾( + , 𝐹)‘𝑀) ∈ 𝑆 ∧ (seq(𝑀 + 1)( + , 𝐹)‘𝑛) ∈ 𝑆 ∧ (𝐹‘(𝑛 + 1)) ∈ 𝑆)) → (((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)) + (𝐹‘(𝑛 + 1))) = ((seq𝐾( + , 𝐹)‘𝑀) + ((seq(𝑀 + 1)( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1)))))
9257, 69, 81, 89, 91syl13anc 1369 . . . . . . . 8 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → (((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)) + (𝐹‘(𝑛 + 1))) = ((seq𝐾( + , 𝐹)‘𝑀) + ((seq(𝑀 + 1)( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1)))))
9356, 92eqtr4d 2836 . . . . . . 7 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1))) = (((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)) + (𝐹‘(𝑛 + 1))))
9453, 93eqeq12d 2814 . . . . . 6 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ((seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1))) ↔ ((seq𝐾( + , 𝐹)‘𝑛) + (𝐹‘(𝑛 + 1))) = (((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)) + (𝐹‘(𝑛 + 1)))))
9545, 94syl5ibr 249 . . . . 5 ((𝜑 ∧ (𝑛 ∈ (ℤ‘(𝑀 + 1)) ∧ (𝑛 + 1) ∈ ((𝑀 + 1)...𝑁))) → ((seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)) → (seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1)))))
9644, 95animpimp2impd 843 . . . 4 (𝑛 ∈ (ℤ‘(𝑀 + 1)) → ((𝜑 → (𝑛 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑛) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑛)))) → (𝜑 → ((𝑛 + 1) ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘(𝑛 + 1)) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘(𝑛 + 1)))))))
9710, 17, 24, 31, 40, 96uzind4 12296 . . 3 (𝑁 ∈ (ℤ‘(𝑀 + 1)) → (𝜑 → (𝑁 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑁) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁)))))
981, 97mpcom 38 . 2 (𝜑 → (𝑁 ∈ ((𝑀 + 1)...𝑁) → (seq𝐾( + , 𝐹)‘𝑁) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁))))
993, 98mpd 15 1 (𝜑 → (seq𝐾( + , 𝐹)‘𝑁) = ((seq𝐾( + , 𝐹)‘𝑀) + (seq(𝑀 + 1)( + , 𝐹)‘𝑁)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 399   ∧ w3a 1084   = wceq 1538   ∈ wcel 2111  ∀wral 3106   ⊆ wss 3881  ‘cfv 6324  (class class class)co 7135  1c1 10529   + caddc 10531  ℤcz 11971  ℤ≥cuz 12233  ...cfz 12887  seqcseq 13366 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7443  ax-cnex 10584  ax-resscn 10585  ax-1cn 10586  ax-icn 10587  ax-addcl 10588  ax-addrcl 10589  ax-mulcl 10590  ax-mulrcl 10591  ax-mulcom 10592  ax-addass 10593  ax-mulass 10594  ax-distr 10595  ax-i2m1 10596  ax-1ne0 10597  ax-1rid 10598  ax-rnegex 10599  ax-rrecex 10600  ax-cnre 10601  ax-pre-lttri 10602  ax-pre-lttrn 10603  ax-pre-ltadd 10604  ax-pre-mulgt0 10605 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-nel 3092  df-ral 3111  df-rex 3112  df-reu 3113  df-rab 3115  df-v 3443  df-sbc 3721  df-csb 3829  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-pss 3900  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-tp 4530  df-op 4532  df-uni 4801  df-iun 4883  df-br 5031  df-opab 5093  df-mpt 5111  df-tr 5137  df-id 5425  df-eprel 5430  df-po 5438  df-so 5439  df-fr 5478  df-we 5480  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-pred 6116  df-ord 6162  df-on 6163  df-lim 6164  df-suc 6165  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331  df-fv 6332  df-riota 7093  df-ov 7138  df-oprab 7139  df-mpo 7140  df-om 7563  df-1st 7673  df-2nd 7674  df-wrecs 7932  df-recs 7993  df-rdg 8031  df-er 8274  df-en 8495  df-dom 8496  df-sdom 8497  df-pnf 10668  df-mnf 10669  df-xr 10670  df-ltxr 10671  df-le 10672  df-sub 10863  df-neg 10864  df-nn 11628  df-n0 11888  df-z 11972  df-uz 12234  df-fz 12888  df-seq 13367 This theorem is referenced by:  seq1p  13402  seqf1olem2  13408  bcval5  13676  clim2ser  15005  clim2ser2  15006  isumsplit  15189  clim2div  15239  gsumsgrpccat  17998  gsumccatOLD  17999  mulgnndir  18251  mblfinlem2  35111  fmul01lt1lem1  42241  fmul01lt1lem2  42242
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