Theorem fsum0diaglem 12019

Description: Lemma for fisum0diag 12020. (Contributed by Mario Carneiro, 28-Apr-2014.) (Revised by Mario Carneiro, 8-Apr-2016.)

Assertion

Ref	Expression
fsum0diaglem	⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑘 ∈ (0...𝑁) ∧ 𝑗 ∈ (0...(𝑁 − 𝑘))))

Distinct variable group:   𝑗,𝑘,𝑁

Proof of Theorem fsum0diaglem

Step	Hyp	Ref	Expression
1		elfzle1 10262	. . . . . . 7 ⊢ (𝑗 ∈ (0...𝑁) → 0 ≤ 𝑗)
2	1	adantr 276	. . . . . 6 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 0 ≤ 𝑗)
3		elfz3nn0 10350	. . . . . . . . . 10 ⊢ (𝑗 ∈ (0...𝑁) → 𝑁 ∈ ℕ0)
4	3	adantr 276	. . . . . . . . 9 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑁 ∈ ℕ0)
5	4	nn0zd 9600	. . . . . . . 8 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑁 ∈ ℤ)
6	5	zred 9602	. . . . . . 7 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑁 ∈ ℝ)
7		elfzelz 10260	. . . . . . . . 9 ⊢ (𝑗 ∈ (0...𝑁) → 𝑗 ∈ ℤ)
8	7	adantr 276	. . . . . . . 8 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ∈ ℤ)
9	8	zred 9602	. . . . . . 7 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ∈ ℝ)
10	6, 9	subge02d 8717	. . . . . 6 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (0 ≤ 𝑗 ↔ (𝑁 − 𝑗) ≤ 𝑁))
11	2, 10	mpbid 147	. . . . 5 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑁 − 𝑗) ≤ 𝑁)
12	5, 8	zsubcld 9607	. . . . . 6 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑁 − 𝑗) ∈ ℤ)
13		eluz 9769	. . . . . 6 ⊢ (((𝑁 − 𝑗) ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 ∈ (ℤ≥‘(𝑁 − 𝑗)) ↔ (𝑁 − 𝑗) ≤ 𝑁))
14	12, 5, 13	syl2anc 411	. . . . 5 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑁 ∈ (ℤ≥‘(𝑁 − 𝑗)) ↔ (𝑁 − 𝑗) ≤ 𝑁))
15	11, 14	mpbird 167	. . . 4 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑁 ∈ (ℤ≥‘(𝑁 − 𝑗)))
16		fzss2 10299	. . . 4 ⊢ (𝑁 ∈ (ℤ≥‘(𝑁 − 𝑗)) → (0...(𝑁 − 𝑗)) ⊆ (0...𝑁))
17	15, 16	syl 14	. . 3 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (0...(𝑁 − 𝑗)) ⊆ (0...𝑁))
18		simpr 110	. . 3 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ∈ (0...(𝑁 − 𝑗)))
19	17, 18	sseldd 3228	. 2 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ∈ (0...𝑁))
20		elfzelz 10260	. . . . . 6 ⊢ (𝑘 ∈ (0...(𝑁 − 𝑗)) → 𝑘 ∈ ℤ)
21	20	adantl 277	. . . . 5 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ∈ ℤ)
22	21	zred 9602	. . . 4 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ∈ ℝ)
23		elfzle2 10263	. . . . 5 ⊢ (𝑘 ∈ (0...(𝑁 − 𝑗)) → 𝑘 ≤ (𝑁 − 𝑗))
24	23	adantl 277	. . . 4 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ≤ (𝑁 − 𝑗))
25	22, 6, 9, 24	lesubd 8729	. . 3 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ≤ (𝑁 − 𝑘))
26		elfzuz 10256	. . . . 5 ⊢ (𝑗 ∈ (0...𝑁) → 𝑗 ∈ (ℤ≥‘0))
27	26	adantr 276	. . . 4 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ∈ (ℤ≥‘0))
28	5, 21	zsubcld 9607	. . . 4 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑁 − 𝑘) ∈ ℤ)
29		elfz5 10252	. . . 4 ⊢ ((𝑗 ∈ (ℤ≥‘0) ∧ (𝑁 − 𝑘) ∈ ℤ) → (𝑗 ∈ (0...(𝑁 − 𝑘)) ↔ 𝑗 ≤ (𝑁 − 𝑘)))
30	27, 28, 29	syl2anc 411	. . 3 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑗 ∈ (0...(𝑁 − 𝑘)) ↔ 𝑗 ≤ (𝑁 − 𝑘)))
31	25, 30	mpbird 167	. 2 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ∈ (0...(𝑁 − 𝑘)))
32	19, 31	jca 306	1 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑘 ∈ (0...𝑁) ∧ 𝑗 ∈ (0...(𝑁 − 𝑘))))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   ∈ wcel 2202   ⊆ wss 3200   class class class wbr 4088  ‘cfv 5326  (class class class)co 6018  0cc0 8032   ≤ cle 8215   − cmin 8350  ℕ₀cn0 9402  ℤcz 9479  ℤ_≥cuz 9755  ...cfz 10243

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8123  ax-resscn 8124  ax-1cn 8125  ax-1re 8126  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-addcom 8132  ax-addass 8134  ax-distr 8136  ax-i2m1 8137  ax-0lt1 8138  ax-0id 8140  ax-rnegex 8141  ax-cnre 8143  ax-pre-ltirr 8144  ax-pre-ltwlin 8145  ax-pre-lttrn 8146  ax-pre-ltadd 8148

This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-pnf 8216  df-mnf 8217  df-xr 8218  df-ltxr 8219  df-le 8220  df-sub 8352  df-neg 8353  df-inn 9144  df-n0 9403  df-z 9480  df-uz 9756  df-fz 10244

This theorem is referenced by:  fisum0diag  12020  fprod0diagfz  12207