Theorem fsum0diaglem 12151

Description: Lemma for fisum0diag 12152. (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 10381	. . . . . . 7 ⊢ (𝑗 ∈ (0...𝑁) → 0 ≤ 𝑗)
2	1	adantr 276	. . . . . 6 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 0 ≤ 𝑗)
3		elfz3nn0 10471	. . . . . . . . . 10 ⊢ (𝑗 ∈ (0...𝑁) → 𝑁 ∈ ℕ0)
4	3	adantr 276	. . . . . . . . 9 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑁 ∈ ℕ0)
5	4	nn0zd 9716	. . . . . . . 8 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑁 ∈ ℤ)
6	5	zred 9718	. . . . . . 7 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑁 ∈ ℝ)
7		elfzelz 10378	. . . . . . . . 9 ⊢ (𝑗 ∈ (0...𝑁) → 𝑗 ∈ ℤ)
8	7	adantr 276	. . . . . . . 8 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ∈ ℤ)
9	8	zred 9718	. . . . . . 7 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ∈ ℝ)
10	6, 9	subge02d 8828	. . . . . 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 9723	. . . . . 6 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑁 − 𝑗) ∈ ℤ)
13		eluz 9885	. . . . . 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 10419	. . . 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 3243	. 2 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ∈ (0...𝑁))
20		elfzelz 10378	. . . . . 6 ⊢ (𝑘 ∈ (0...(𝑁 − 𝑗)) → 𝑘 ∈ ℤ)
21	20	adantl 277	. . . . 5 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ∈ ℤ)
22	21	zred 9718	. . . 4 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑘 ∈ ℝ)
23		elfzle2 10382	. . . . 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 8840	. . 3 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → 𝑗 ≤ (𝑁 − 𝑘))
26		elfzuz 10374	. . . . 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 9723	. . . 4 ⊢ ((𝑗 ∈ (0...𝑁) ∧ 𝑘 ∈ (0...(𝑁 − 𝑗))) → (𝑁 − 𝑘) ∈ ℤ)
29		elfz5 10370	. . . 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 2205   ⊆ wss 3214   class class class wbr 4114  ‘cfv 5357  (class class class)co 6058  0cc0 8143   ≤ cle 8325   − cmin 8460  ℕ₀cn0 9513  ℤcz 9594  ℤ_≥cuz 9871  ...cfz 10361

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8462  df-neg 8463  df-inn 9255  df-n0 9514  df-z 9595  df-uz 9872  df-fz 10362

This theorem is referenced by:  fisum0diag  12152  fprod0diagfz  12339