Theorem fnn0ind 9191

Description: Induction on the integers from 0 to 𝑁 inclusive . The first four hypotheses give us the substitution instances we need; the last two are the basis and the induction step. (Contributed by Paul Chapman, 31-Mar-2011.)

Hypotheses

Ref	Expression
fnn0ind.1	⊢ (𝑥 = 0 → (𝜑 ↔ 𝜓))
fnn0ind.2	⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜒))
fnn0ind.3	⊢ (𝑥 = (𝑦 + 1) → (𝜑 ↔ 𝜃))
fnn0ind.4	⊢ (𝑥 = 𝐾 → (𝜑 ↔ 𝜏))
fnn0ind.5	⊢ (𝑁 ∈ ℕ0 → 𝜓)
fnn0ind.6	⊢ ((𝑁 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0 ∧ 𝑦 < 𝑁) → (𝜒 → 𝜃))

Assertion

Ref	Expression
fnn0ind	⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℕ0 ∧ 𝐾 ≤ 𝑁) → 𝜏)

Distinct variable groups:   𝑥,𝐾   𝑥,𝑁,𝑦   𝜒,𝑥   𝜑,𝑦   𝜓,𝑥   𝜏,𝑥   𝜃,𝑥

Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑦)   𝜒(𝑦)   𝜃(𝑦)   𝜏(𝑦)   𝐾(𝑦)

Proof of Theorem fnn0ind

Step	Hyp	Ref	Expression
1		elnn0z 9091	. . . 4 ⊢ (𝐾 ∈ ℕ0 ↔ (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾))
2		nn0z 9098	. . . . . 6 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ ℤ)
3		0z 9089	. . . . . . . 8 ⊢ 0 ∈ ℤ
4		fnn0ind.1	. . . . . . . . 9 ⊢ (𝑥 = 0 → (𝜑 ↔ 𝜓))
5		fnn0ind.2	. . . . . . . . 9 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜒))
6		fnn0ind.3	. . . . . . . . 9 ⊢ (𝑥 = (𝑦 + 1) → (𝜑 ↔ 𝜃))
7		fnn0ind.4	. . . . . . . . 9 ⊢ (𝑥 = 𝐾 → (𝜑 ↔ 𝜏))
8		elnn0z 9091	. . . . . . . . . . 11 ⊢ (𝑁 ∈ ℕ0 ↔ (𝑁 ∈ ℤ ∧ 0 ≤ 𝑁))
9		fnn0ind.5	. . . . . . . . . . 11 ⊢ (𝑁 ∈ ℕ0 → 𝜓)
10	8, 9	sylbir 134	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℤ ∧ 0 ≤ 𝑁) → 𝜓)
11	10	3adant1 1000	. . . . . . . . 9 ⊢ ((0 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 0 ≤ 𝑁) → 𝜓)
12		zre 9082	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 ∈ ℤ → 𝑦 ∈ ℝ)
13		zre 9082	. . . . . . . . . . . . . . . 16 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ)
14		0re 7790	. . . . . . . . . . . . . . . . 17 ⊢ 0 ∈ ℝ
15		lelttr 7876	. . . . . . . . . . . . . . . . . 18 ⊢ ((0 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑁 ∈ ℝ) → ((0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → 0 < 𝑁))
16		ltle 7875	. . . . . . . . . . . . . . . . . . 19 ⊢ ((0 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (0 < 𝑁 → 0 ≤ 𝑁))
17	16	3adant2 1001	. . . . . . . . . . . . . . . . . 18 ⊢ ((0 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (0 < 𝑁 → 0 ≤ 𝑁))
18	15, 17	syld 45	. . . . . . . . . . . . . . . . 17 ⊢ ((0 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑁 ∈ ℝ) → ((0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → 0 ≤ 𝑁))
19	14, 18	mp3an1 1303	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ∈ ℝ ∧ 𝑁 ∈ ℝ) → ((0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → 0 ≤ 𝑁))
20	12, 13, 19	syl2an 287	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → 0 ≤ 𝑁))
21	20	ex 114	. . . . . . . . . . . . . 14 ⊢ (𝑦 ∈ ℤ → (𝑁 ∈ ℤ → ((0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → 0 ≤ 𝑁)))
22	21	com23 78	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ ℤ → ((0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → (𝑁 ∈ ℤ → 0 ≤ 𝑁)))
23	22	3impib 1180	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → (𝑁 ∈ ℤ → 0 ≤ 𝑁))
24	23	impcom 124	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℤ ∧ (𝑦 ∈ ℤ ∧ 0 ≤ 𝑦 ∧ 𝑦 < 𝑁)) → 0 ≤ 𝑁)
25		elnn0z 9091	. . . . . . . . . . . . . . . . 17 ⊢ (𝑦 ∈ ℕ0 ↔ (𝑦 ∈ ℤ ∧ 0 ≤ 𝑦))
26	25	anbi1i 454	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ∈ ℕ0 ∧ 𝑦 < 𝑁) ↔ ((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦) ∧ 𝑦 < 𝑁))
27		fnn0ind.6	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0 ∧ 𝑦 < 𝑁) → (𝜒 → 𝜃))
28	27	3expb 1183	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 ∈ ℕ0 ∧ (𝑦 ∈ ℕ0 ∧ 𝑦 < 𝑁)) → (𝜒 → 𝜃))
29	8, 26, 28	syl2anbr 290	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℤ ∧ 0 ≤ 𝑁) ∧ ((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦) ∧ 𝑦 < 𝑁)) → (𝜒 → 𝜃))
30	29	expcom 115	. . . . . . . . . . . . . 14 ⊢ (((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦) ∧ 𝑦 < 𝑁) → ((𝑁 ∈ ℤ ∧ 0 ≤ 𝑁) → (𝜒 → 𝜃)))
31	30	3impa 1177	. . . . . . . . . . . . 13 ⊢ ((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → ((𝑁 ∈ ℤ ∧ 0 ≤ 𝑁) → (𝜒 → 𝜃)))
32	31	expd 256	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ ℤ ∧ 0 ≤ 𝑦 ∧ 𝑦 < 𝑁) → (𝑁 ∈ ℤ → (0 ≤ 𝑁 → (𝜒 → 𝜃))))
33	32	impcom 124	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℤ ∧ (𝑦 ∈ ℤ ∧ 0 ≤ 𝑦 ∧ 𝑦 < 𝑁)) → (0 ≤ 𝑁 → (𝜒 → 𝜃)))
34	24, 33	mpd 13	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℤ ∧ (𝑦 ∈ ℤ ∧ 0 ≤ 𝑦 ∧ 𝑦 < 𝑁)) → (𝜒 → 𝜃))
35	34	adantll 468	. . . . . . . . 9 ⊢ (((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ ℤ ∧ 0 ≤ 𝑦 ∧ 𝑦 < 𝑁)) → (𝜒 → 𝜃))
36	4, 5, 6, 7, 11, 35	fzind 9190	. . . . . . . 8 ⊢ (((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁)) → 𝜏)
37	3, 36	mpanl1 431	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁)) → 𝜏)
38	37	expcom 115	. . . . . 6 ⊢ ((𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁) → (𝑁 ∈ ℤ → 𝜏))
39	2, 38	syl5 32	. . . . 5 ⊢ ((𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁) → (𝑁 ∈ ℕ0 → 𝜏))
40	39	3expa 1182	. . . 4 ⊢ (((𝐾 ∈ ℤ ∧ 0 ≤ 𝐾) ∧ 𝐾 ≤ 𝑁) → (𝑁 ∈ ℕ0 → 𝜏))
41	1, 40	sylanb 282	. . 3 ⊢ ((𝐾 ∈ ℕ0 ∧ 𝐾 ≤ 𝑁) → (𝑁 ∈ ℕ0 → 𝜏))
42	41	impcom 124	. 2 ⊢ ((𝑁 ∈ ℕ0 ∧ (𝐾 ∈ ℕ0 ∧ 𝐾 ≤ 𝑁)) → 𝜏)
43	42	3impb 1178	1 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℕ0 ∧ 𝐾 ≤ 𝑁) → 𝜏)

Syntax hints:   → wi 4   ∧ wa 103   ↔ wb 104   ∧ w3a 963   = wceq 1332   ∈ wcel 1481   class class class wbr 3937  (class class class)co 5782  ℝcr 7643  0cc0 7644  1c1 7645   + caddc 7647   < clt 7824   ≤ cle 7825  ℕ₀cn0 9001  ℤcz 9078

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4054  ax-pow 4106  ax-pr 4139  ax-un 4363  ax-setind 4460  ax-cnex 7735  ax-resscn 7736  ax-1cn 7737  ax-1re 7738  ax-icn 7739  ax-addcl 7740  ax-addrcl 7741  ax-mulcl 7742  ax-addcom 7744  ax-addass 7746  ax-distr 7748  ax-i2m1 7749  ax-0lt1 7750  ax-0id 7752  ax-rnegex 7753  ax-cnre 7755  ax-pre-ltirr 7756  ax-pre-ltwlin 7757  ax-pre-lttrn 7758  ax-pre-ltadd 7760

This theorem depends on definitions:  df-bi 116  df-3or 964  df-3an 965  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ne 2310  df-nel 2405  df-ral 2422  df-rex 2423  df-reu 2424  df-rab 2426  df-v 2691  df-sbc 2914  df-dif 3078  df-un 3080  df-in 3082  df-ss 3089  df-pw 3517  df-sn 3538  df-pr 3539  df-op 3541  df-uni 3745  df-int 3780  df-br 3938  df-opab 3998  df-id 4223  df-xp 4553  df-rel 4554  df-cnv 4555  df-co 4556  df-dm 4557  df-iota 5096  df-fun 5133  df-fv 5139  df-riota 5738  df-ov 5785  df-oprab 5786  df-mpo 5787  df-pnf 7826  df-mnf 7827  df-xr 7828  df-ltxr 7829  df-le 7830  df-sub 7959  df-neg 7960  df-inn 8745  df-n0 9002  df-z 9079

This theorem is referenced by:  nn0seqcvgd  11758