Theorem lighneallem2 43820

Description: Lemma 2 for lighneal 43825. (Contributed by AV, 13-Aug-2021.)

Assertion

Ref	Expression
lighneallem2	⊢ (((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 2 ∥ 𝑁 ∧ ((2↑𝑁) − 1) = (𝑃↑𝑀)) → 𝑀 = 1)

Proof of Theorem lighneallem2

Dummy variable 𝑘 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		evennn2n 15700	. . . 4 ⊢ (𝑁 ∈ ℕ → (2 ∥ 𝑁 ↔ ∃𝑘 ∈ ℕ (2 · 𝑘) = 𝑁))
2	1	3ad2ant3 1131	. . 3 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (2 ∥ 𝑁 ↔ ∃𝑘 ∈ ℕ (2 · 𝑘) = 𝑁))
3		oveq2 7164	. . . . . . . . 9 ⊢ (𝑁 = (2 · 𝑘) → (2↑𝑁) = (2↑(2 · 𝑘)))
4	3	eqcoms 2829	. . . . . . . 8 ⊢ ((2 · 𝑘) = 𝑁 → (2↑𝑁) = (2↑(2 · 𝑘)))
5		2cnd 11716	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ ℕ → 2 ∈ ℂ)
6		nncn 11646	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℂ)
7	5, 6	mulcomd 10662	. . . . . . . . . . 11 ⊢ (𝑘 ∈ ℕ → (2 · 𝑘) = (𝑘 · 2))
8	7	oveq2d 7172	. . . . . . . . . 10 ⊢ (𝑘 ∈ ℕ → (2↑(2 · 𝑘)) = (2↑(𝑘 · 2)))
9		2nn0 11915	. . . . . . . . . . . 12 ⊢ 2 ∈ ℕ0
10	9	a1i 11	. . . . . . . . . . 11 ⊢ (𝑘 ∈ ℕ → 2 ∈ ℕ0)
11		nnnn0 11905	. . . . . . . . . . 11 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℕ0)
12	5, 10, 11	expmuld 13514	. . . . . . . . . 10 ⊢ (𝑘 ∈ ℕ → (2↑(𝑘 · 2)) = ((2↑𝑘)↑2))
13	8, 12	eqtrd 2856	. . . . . . . . 9 ⊢ (𝑘 ∈ ℕ → (2↑(2 · 𝑘)) = ((2↑𝑘)↑2))
14	13	adantl 484	. . . . . . . 8 ⊢ (((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 𝑘 ∈ ℕ) → (2↑(2 · 𝑘)) = ((2↑𝑘)↑2))
15	4, 14	sylan9eqr 2878	. . . . . . 7 ⊢ ((((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 𝑘 ∈ ℕ) ∧ (2 · 𝑘) = 𝑁) → (2↑𝑁) = ((2↑𝑘)↑2))
16	15	oveq1d 7171	. . . . . 6 ⊢ ((((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 𝑘 ∈ ℕ) ∧ (2 · 𝑘) = 𝑁) → ((2↑𝑁) − 1) = (((2↑𝑘)↑2) − 1))
17	16	eqeq1d 2823	. . . . 5 ⊢ ((((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 𝑘 ∈ ℕ) ∧ (2 · 𝑘) = 𝑁) → (((2↑𝑁) − 1) = (𝑃↑𝑀) ↔ (((2↑𝑘)↑2) − 1) = (𝑃↑𝑀)))
18		elnn1uz2 12326	. . . . . . . 8 ⊢ (𝑘 ∈ ℕ ↔ (𝑘 = 1 ∨ 𝑘 ∈ (ℤ≥‘2)))
19		oveq2 7164	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 = 1 → (2↑𝑘) = (2↑1))
20		2cn 11713	. . . . . . . . . . . . . . . . . 18 ⊢ 2 ∈ ℂ
21		exp1 13436	. . . . . . . . . . . . . . . . . 18 ⊢ (2 ∈ ℂ → (2↑1) = 2)
22	20, 21	ax-mp 5	. . . . . . . . . . . . . . . . 17 ⊢ (2↑1) = 2
23	19, 22	syl6eq 2872	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 = 1 → (2↑𝑘) = 2)
24	23	oveq1d 7171	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 1 → ((2↑𝑘)↑2) = (2↑2))
25	24	oveq1d 7171	. . . . . . . . . . . . . 14 ⊢ (𝑘 = 1 → (((2↑𝑘)↑2) − 1) = ((2↑2) − 1))
26		sq2 13561	. . . . . . . . . . . . . . . 16 ⊢ (2↑2) = 4
27	26	oveq1i 7166	. . . . . . . . . . . . . . 15 ⊢ ((2↑2) − 1) = (4 − 1)
28		4m1e3 11767	. . . . . . . . . . . . . . 15 ⊢ (4 − 1) = 3
29	27, 28	eqtri 2844	. . . . . . . . . . . . . 14 ⊢ ((2↑2) − 1) = 3
30	25, 29	syl6eq 2872	. . . . . . . . . . . . 13 ⊢ (𝑘 = 1 → (((2↑𝑘)↑2) − 1) = 3)
31	30	eqeq1d 2823	. . . . . . . . . . . 12 ⊢ (𝑘 = 1 → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) ↔ 3 = (𝑃↑𝑀)))
32	31	adantr 483	. . . . . . . . . . 11 ⊢ ((𝑘 = 1 ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) ↔ 3 = (𝑃↑𝑀)))
33		eqcom 2828	. . . . . . . . . . . . . 14 ⊢ (3 = (𝑃↑𝑀) ↔ (𝑃↑𝑀) = 3)
34		eldifi 4103	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → 𝑃 ∈ ℙ)
35		prmnn 16018	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑃 ∈ ℙ → 𝑃 ∈ ℕ)
36		nnre 11645	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑃 ∈ ℕ → 𝑃 ∈ ℝ)
37	34, 35, 36	3syl 18	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → 𝑃 ∈ ℝ)
38	37	3ad2ant1 1129	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 𝑃 ∈ ℝ)
39		nnnn0 11905	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℕ0)
40	39	3ad2ant2 1130	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 𝑀 ∈ ℕ0)
41	38, 40	reexpcld 13528	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑃↑𝑀) ∈ ℝ)
42	41	adantr 483	. . . . . . . . . . . . . . . 16 ⊢ (((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑃↑𝑀) = 3) → (𝑃↑𝑀) ∈ ℝ)
43		simpr 487	. . . . . . . . . . . . . . . 16 ⊢ (((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑃↑𝑀) = 3) → (𝑃↑𝑀) = 3)
44	42, 43	eqled 10743	. . . . . . . . . . . . . . 15 ⊢ (((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑃↑𝑀) = 3) → (𝑃↑𝑀) ≤ 3)
45	44	ex 415	. . . . . . . . . . . . . 14 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑃↑𝑀) = 3 → (𝑃↑𝑀) ≤ 3))
46	33, 45	syl5bi 244	. . . . . . . . . . . . 13 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (3 = (𝑃↑𝑀) → (𝑃↑𝑀) ≤ 3))
47	35	nnred 11653	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑃 ∈ ℙ → 𝑃 ∈ ℝ)
48		prmgt1 16041	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑃 ∈ ℙ → 1 < 𝑃)
49	47, 48	jca 514	. . . . . . . . . . . . . . . . 17 ⊢ (𝑃 ∈ ℙ → (𝑃 ∈ ℝ ∧ 1 < 𝑃))
50	34, 49	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (𝑃 ∈ ℝ ∧ 1 < 𝑃))
51	50	3ad2ant1 1129	. . . . . . . . . . . . . . 15 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑃 ∈ ℝ ∧ 1 < 𝑃))
52		nnz 12005	. . . . . . . . . . . . . . . 16 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℤ)
53	52	3ad2ant2 1130	. . . . . . . . . . . . . . 15 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 𝑀 ∈ ℤ)
54		3rp 12396	. . . . . . . . . . . . . . . 16 ⊢ 3 ∈ ℝ+
55	54	a1i 11	. . . . . . . . . . . . . . 15 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 3 ∈ ℝ+)
56		efexple 25857	. . . . . . . . . . . . . . 15 ⊢ (((𝑃 ∈ ℝ ∧ 1 < 𝑃) ∧ 𝑀 ∈ ℤ ∧ 3 ∈ ℝ+) → ((𝑃↑𝑀) ≤ 3 ↔ 𝑀 ≤ (⌊‘((log‘3) / (log‘𝑃)))))
57	51, 53, 55, 56	syl3anc 1367	. . . . . . . . . . . . . 14 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑃↑𝑀) ≤ 3 ↔ 𝑀 ≤ (⌊‘((log‘3) / (log‘𝑃)))))
58		oddprmge3 16044	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → 𝑃 ∈ (ℤ≥‘3))
59		eluzle 12257	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑃 ∈ (ℤ≥‘3) → 3 ≤ 𝑃)
60	58, 59	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → 3 ≤ 𝑃)
61	54	a1i 11	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → 3 ∈ ℝ+)
62		nnrp 12401	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑃 ∈ ℕ → 𝑃 ∈ ℝ+)
63	34, 35, 62	3syl 18	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → 𝑃 ∈ ℝ+)
64	61, 63	logled 25210	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (3 ≤ 𝑃 ↔ (log‘3) ≤ (log‘𝑃)))
65	60, 64	mpbid 234	. . . . . . . . . . . . . . . . 17 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (log‘3) ≤ (log‘𝑃))
66	65	3ad2ant1 1129	. . . . . . . . . . . . . . . 16 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (log‘3) ≤ (log‘𝑃))
67		relogcl 25159	. . . . . . . . . . . . . . . . . 18 ⊢ (3 ∈ ℝ+ → (log‘3) ∈ ℝ)
68	54, 67	ax-mp 5	. . . . . . . . . . . . . . . . 17 ⊢ (log‘3) ∈ ℝ
69		rplogcl 25187	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑃 ∈ ℝ ∧ 1 < 𝑃) → (log‘𝑃) ∈ ℝ+)
70	34, 49, 69	3syl 18	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (log‘𝑃) ∈ ℝ+)
71	70	3ad2ant1 1129	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (log‘𝑃) ∈ ℝ+)
72		divle1le 12460	. . . . . . . . . . . . . . . . 17 ⊢ (((log‘3) ∈ ℝ ∧ (log‘𝑃) ∈ ℝ+) → (((log‘3) / (log‘𝑃)) ≤ 1 ↔ (log‘3) ≤ (log‘𝑃)))
73	68, 71, 72	sylancr 589	. . . . . . . . . . . . . . . 16 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (((log‘3) / (log‘𝑃)) ≤ 1 ↔ (log‘3) ≤ (log‘𝑃)))
74	66, 73	mpbird 259	. . . . . . . . . . . . . . 15 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((log‘3) / (log‘𝑃)) ≤ 1)
75		fldivle 13202	. . . . . . . . . . . . . . . . 17 ⊢ (((log‘3) ∈ ℝ ∧ (log‘𝑃) ∈ ℝ+) → (⌊‘((log‘3) / (log‘𝑃))) ≤ ((log‘3) / (log‘𝑃)))
76	68, 71, 75	sylancr 589	. . . . . . . . . . . . . . . 16 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (⌊‘((log‘3) / (log‘𝑃))) ≤ ((log‘3) / (log‘𝑃)))
77		nnre 11645	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℝ)
78	77	3ad2ant2 1130	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 𝑀 ∈ ℝ)
79	68	a1i 11	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (log‘3) ∈ ℝ)
80	62	relogcld 25206	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑃 ∈ ℕ → (log‘𝑃) ∈ ℝ)
81	34, 35, 80	3syl 18	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (log‘𝑃) ∈ ℝ)
82	35	nnrpd 12430	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑃 ∈ ℙ → 𝑃 ∈ ℝ+)
83		1red 10642	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑃 ∈ ℙ → 1 ∈ ℝ)
84	83, 48	gtned 10775	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑃 ∈ ℙ → 𝑃 ≠ 1)
85	82, 84	jca 514	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑃 ∈ ℙ → (𝑃 ∈ ℝ+ ∧ 𝑃 ≠ 1))
86		logne0 25163	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝑃 ∈ ℝ+ ∧ 𝑃 ≠ 1) → (log‘𝑃) ≠ 0)
87	34, 85, 86	3syl 18	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (log‘𝑃) ≠ 0)
88	79, 81, 87	redivcld 11468	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → ((log‘3) / (log‘𝑃)) ∈ ℝ)
89	88	flcld 13169	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (⌊‘((log‘3) / (log‘𝑃))) ∈ ℤ)
90	89	zred 12088	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (⌊‘((log‘3) / (log‘𝑃))) ∈ ℝ)
91	90	3ad2ant1 1129	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (⌊‘((log‘3) / (log‘𝑃))) ∈ ℝ)
92	88	3ad2ant1 1129	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((log‘3) / (log‘𝑃)) ∈ ℝ)
93		letr 10734	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℝ ∧ (⌊‘((log‘3) / (log‘𝑃))) ∈ ℝ ∧ ((log‘3) / (log‘𝑃)) ∈ ℝ) → ((𝑀 ≤ (⌊‘((log‘3) / (log‘𝑃))) ∧ (⌊‘((log‘3) / (log‘𝑃))) ≤ ((log‘3) / (log‘𝑃))) → 𝑀 ≤ ((log‘3) / (log‘𝑃))))
94	78, 91, 92, 93	syl3anc 1367	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 ≤ (⌊‘((log‘3) / (log‘𝑃))) ∧ (⌊‘((log‘3) / (log‘𝑃))) ≤ ((log‘3) / (log‘𝑃))) → 𝑀 ≤ ((log‘3) / (log‘𝑃))))
95		1red 10642	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 1 ∈ ℝ)
96		letr 10734	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑀 ∈ ℝ ∧ ((log‘3) / (log‘𝑃)) ∈ ℝ ∧ 1 ∈ ℝ) → ((𝑀 ≤ ((log‘3) / (log‘𝑃)) ∧ ((log‘3) / (log‘𝑃)) ≤ 1) → 𝑀 ≤ 1))
97	78, 92, 95, 96	syl3anc 1367	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 ≤ ((log‘3) / (log‘𝑃)) ∧ ((log‘3) / (log‘𝑃)) ≤ 1) → 𝑀 ≤ 1))
98		nnge1 11666	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑀 ∈ ℕ → 1 ≤ 𝑀)
99		eqcom 2828	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑀 = 1 ↔ 1 = 𝑀)
100		1red 10642	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑀 ∈ ℕ → 1 ∈ ℝ)
101	100, 77	letri3d 10782	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑀 ∈ ℕ → (1 = 𝑀 ↔ (1 ≤ 𝑀 ∧ 𝑀 ≤ 1)))
102	99, 101	syl5rbb 286	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑀 ∈ ℕ → ((1 ≤ 𝑀 ∧ 𝑀 ≤ 1) ↔ 𝑀 = 1))
103	102	biimpd 231	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑀 ∈ ℕ → ((1 ≤ 𝑀 ∧ 𝑀 ≤ 1) → 𝑀 = 1))
104	98, 103	mpand 693	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑀 ∈ ℕ → (𝑀 ≤ 1 → 𝑀 = 1))
105	104	3ad2ant2 1130	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ≤ 1 → 𝑀 = 1))
106	97, 105	syld 47	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 ≤ ((log‘3) / (log‘𝑃)) ∧ ((log‘3) / (log‘𝑃)) ≤ 1) → 𝑀 = 1))
107	106	expd 418	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ≤ ((log‘3) / (log‘𝑃)) → (((log‘3) / (log‘𝑃)) ≤ 1 → 𝑀 = 1)))
108	94, 107	syld 47	. . . . . . . . . . . . . . . 16 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 ≤ (⌊‘((log‘3) / (log‘𝑃))) ∧ (⌊‘((log‘3) / (log‘𝑃))) ≤ ((log‘3) / (log‘𝑃))) → (((log‘3) / (log‘𝑃)) ≤ 1 → 𝑀 = 1)))
109	76, 108	mpan2d 692	. . . . . . . . . . . . . . 15 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ≤ (⌊‘((log‘3) / (log‘𝑃))) → (((log‘3) / (log‘𝑃)) ≤ 1 → 𝑀 = 1)))
110	74, 109	mpid 44	. . . . . . . . . . . . . 14 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ≤ (⌊‘((log‘3) / (log‘𝑃))) → 𝑀 = 1))
111	57, 110	sylbid 242	. . . . . . . . . . . . 13 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑃↑𝑀) ≤ 3 → 𝑀 = 1))
112	46, 111	syld 47	. . . . . . . . . . . 12 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (3 = (𝑃↑𝑀) → 𝑀 = 1))
113	112	adantl 484	. . . . . . . . . . 11 ⊢ ((𝑘 = 1 ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → (3 = (𝑃↑𝑀) → 𝑀 = 1))
114	32, 113	sylbid 242	. . . . . . . . . 10 ⊢ ((𝑘 = 1 ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1))
115	114	ex 415	. . . . . . . . 9 ⊢ (𝑘 = 1 → ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1)))
116		sq1 13559	. . . . . . . . . . . . . 14 ⊢ (1↑2) = 1
117	116	eqcomi 2830	. . . . . . . . . . . . 13 ⊢ 1 = (1↑2)
118	117	oveq2i 7167	. . . . . . . . . . . 12 ⊢ (((2↑𝑘)↑2) − 1) = (((2↑𝑘)↑2) − (1↑2))
119	118	eqeq1i 2826	. . . . . . . . . . 11 ⊢ ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) ↔ (((2↑𝑘)↑2) − (1↑2)) = (𝑃↑𝑀))
120		eqcom 2828	. . . . . . . . . . . 12 ⊢ ((((2↑𝑘)↑2) − (1↑2)) = (𝑃↑𝑀) ↔ (𝑃↑𝑀) = (((2↑𝑘)↑2) − (1↑2)))
121	9	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ (ℤ≥‘2) → 2 ∈ ℕ0)
122		eluzge2nn0 12288	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ (ℤ≥‘2) → 𝑘 ∈ ℕ0)
123	121, 122	nn0expcld 13608	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ (ℤ≥‘2) → (2↑𝑘) ∈ ℕ0)
124	123	adantr 483	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → (2↑𝑘) ∈ ℕ0)
125		1nn0 11914	. . . . . . . . . . . . . . 15 ⊢ 1 ∈ ℕ0
126	125	a1i 11	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → 1 ∈ ℕ0)
127		1p1e2 11763	. . . . . . . . . . . . . . . . 17 ⊢ (1 + 1) = 2
128	22	eqcomi 2830	. . . . . . . . . . . . . . . . 17 ⊢ 2 = (2↑1)
129	127, 128	eqtri 2844	. . . . . . . . . . . . . . . 16 ⊢ (1 + 1) = (2↑1)
130		eluz2gt1 12321	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 ∈ (ℤ≥‘2) → 1 < 𝑘)
131		2re 11712	. . . . . . . . . . . . . . . . . . 19 ⊢ 2 ∈ ℝ
132	131	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑘 ∈ (ℤ≥‘2) → 2 ∈ ℝ)
133		1zzd 12014	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑘 ∈ (ℤ≥‘2) → 1 ∈ ℤ)
134		eluzelz 12254	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑘 ∈ (ℤ≥‘2) → 𝑘 ∈ ℤ)
135		1lt2 11809	. . . . . . . . . . . . . . . . . . 19 ⊢ 1 < 2
136	135	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑘 ∈ (ℤ≥‘2) → 1 < 2)
137	132, 133, 134, 136	ltexp2d 13615	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 ∈ (ℤ≥‘2) → (1 < 𝑘 ↔ (2↑1) < (2↑𝑘)))
138	130, 137	mpbid 234	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ (ℤ≥‘2) → (2↑1) < (2↑𝑘))
139	129, 138	eqbrtrid 5101	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ (ℤ≥‘2) → (1 + 1) < (2↑𝑘))
140	139	adantr 483	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → (1 + 1) < (2↑𝑘))
141	34, 39	anim12i 614	. . . . . . . . . . . . . . . 16 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ) → (𝑃 ∈ ℙ ∧ 𝑀 ∈ ℕ0))
142	141	3adant3 1128	. . . . . . . . . . . . . . 15 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑃 ∈ ℙ ∧ 𝑀 ∈ ℕ0))
143	142	adantl 484	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → (𝑃 ∈ ℙ ∧ 𝑀 ∈ ℕ0))
144		difsqpwdvds 16223	. . . . . . . . . . . . . 14 ⊢ ((((2↑𝑘) ∈ ℕ0 ∧ 1 ∈ ℕ0 ∧ (1 + 1) < (2↑𝑘)) ∧ (𝑃 ∈ ℙ ∧ 𝑀 ∈ ℕ0)) → ((𝑃↑𝑀) = (((2↑𝑘)↑2) − (1↑2)) → 𝑃 ∥ (2 · 1)))
145	124, 126, 140, 143, 144	syl31anc 1369	. . . . . . . . . . . . 13 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → ((𝑃↑𝑀) = (((2↑𝑘)↑2) − (1↑2)) → 𝑃 ∥ (2 · 1)))
146		2t1e2 11801	. . . . . . . . . . . . . . . . . 18 ⊢ (2 · 1) = 2
147	146	breq2i 5074	. . . . . . . . . . . . . . . . 17 ⊢ (𝑃 ∥ (2 · 1) ↔ 𝑃 ∥ 2)
148		prmuz2 16040	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑃 ∈ ℙ → 𝑃 ∈ (ℤ≥‘2))
149	34, 148	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → 𝑃 ∈ (ℤ≥‘2))
150		2prm 16036	. . . . . . . . . . . . . . . . . 18 ⊢ 2 ∈ ℙ
151		dvdsprm 16047	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃 ∈ (ℤ≥‘2) ∧ 2 ∈ ℙ) → (𝑃 ∥ 2 ↔ 𝑃 = 2))
152	149, 150, 151	sylancl 588	. . . . . . . . . . . . . . . . 17 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (𝑃 ∥ 2 ↔ 𝑃 = 2))
153	147, 152	syl5bb 285	. . . . . . . . . . . . . . . 16 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (𝑃 ∥ (2 · 1) ↔ 𝑃 = 2))
154		eldifsn 4719	. . . . . . . . . . . . . . . . 17 ⊢ (𝑃 ∈ (ℙ ∖ {2}) ↔ (𝑃 ∈ ℙ ∧ 𝑃 ≠ 2))
155		eqneqall 3027	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑃 = 2 → (𝑃 ≠ 2 → 𝑀 = 1))
156	155	com12 32	. . . . . . . . . . . . . . . . 17 ⊢ (𝑃 ≠ 2 → (𝑃 = 2 → 𝑀 = 1))
157	154, 156	simplbiim 507	. . . . . . . . . . . . . . . 16 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (𝑃 = 2 → 𝑀 = 1))
158	153, 157	sylbid 242	. . . . . . . . . . . . . . 15 ⊢ (𝑃 ∈ (ℙ ∖ {2}) → (𝑃 ∥ (2 · 1) → 𝑀 = 1))
159	158	3ad2ant1 1129	. . . . . . . . . . . . . 14 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑃 ∥ (2 · 1) → 𝑀 = 1))
160	159	adantl 484	. . . . . . . . . . . . 13 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → (𝑃 ∥ (2 · 1) → 𝑀 = 1))
161	145, 160	syld 47	. . . . . . . . . . . 12 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → ((𝑃↑𝑀) = (((2↑𝑘)↑2) − (1↑2)) → 𝑀 = 1))
162	120, 161	syl5bi 244	. . . . . . . . . . 11 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → ((((2↑𝑘)↑2) − (1↑2)) = (𝑃↑𝑀) → 𝑀 = 1))
163	119, 162	syl5bi 244	. . . . . . . . . 10 ⊢ ((𝑘 ∈ (ℤ≥‘2) ∧ (𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ)) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1))
164	163	ex 415	. . . . . . . . 9 ⊢ (𝑘 ∈ (ℤ≥‘2) → ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1)))
165	115, 164	jaoi 853	. . . . . . . 8 ⊢ ((𝑘 = 1 ∨ 𝑘 ∈ (ℤ≥‘2)) → ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1)))
166	18, 165	sylbi 219	. . . . . . 7 ⊢ (𝑘 ∈ ℕ → ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1)))
167	166	impcom 410	. . . . . 6 ⊢ (((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 𝑘 ∈ ℕ) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1))
168	167	adantr 483	. . . . 5 ⊢ ((((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 𝑘 ∈ ℕ) ∧ (2 · 𝑘) = 𝑁) → ((((2↑𝑘)↑2) − 1) = (𝑃↑𝑀) → 𝑀 = 1))
169	17, 168	sylbid 242	. . . 4 ⊢ ((((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 𝑘 ∈ ℕ) ∧ (2 · 𝑘) = 𝑁) → (((2↑𝑁) − 1) = (𝑃↑𝑀) → 𝑀 = 1))
170	169	rexlimdva2 3287	. . 3 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (∃𝑘 ∈ ℕ (2 · 𝑘) = 𝑁 → (((2↑𝑁) − 1) = (𝑃↑𝑀) → 𝑀 = 1)))
171	2, 170	sylbid 242	. 2 ⊢ ((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (2 ∥ 𝑁 → (((2↑𝑁) − 1) = (𝑃↑𝑀) → 𝑀 = 1)))
172	171	3imp 1107	1 ⊢ (((𝑃 ∈ (ℙ ∖ {2}) ∧ 𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ 2 ∥ 𝑁 ∧ ((2↑𝑁) − 1) = (𝑃↑𝑀)) → 𝑀 = 1)

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843   ∧ w3a 1083   = wceq 1537   ∈ wcel 2114   ≠ wne 3016  ∃wrex 3139   ∖ cdif 3933  {csn 4567   class class class wbr 5066  ‘cfv 6355  (class class class)co 7156  ℂcc 10535  ℝcr 10536  0cc0 10537  1c1 10538   + caddc 10540   · cmul 10542   < clt 10675   ≤ cle 10676   − cmin 10870   / cdiv 11297  ℕcn 11638  2c2 11693  3c3 11694  4c4 11695  ℕ₀cn0 11898  ℤcz 11982  ℤ_≥cuz 12244  ℝ⁺crp 12390  ⌊cfl 13161  ↑cexp 13430   ∥ cdvds 15607  ℙcprime 16015  logclog 25138

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461  ax-inf2 9104  ax-cnex 10593  ax-resscn 10594  ax-1cn 10595  ax-icn 10596  ax-addcl 10597  ax-addrcl 10598  ax-mulcl 10599  ax-mulrcl 10600  ax-mulcom 10601  ax-addass 10602  ax-mulass 10603  ax-distr 10604  ax-i2m1 10605  ax-1ne0 10606  ax-1rid 10607  ax-rnegex 10608  ax-rrecex 10609  ax-cnre 10610  ax-pre-lttri 10611  ax-pre-lttrn 10612  ax-pre-ltadd 10613  ax-pre-mulgt0 10614  ax-pre-sup 10615  ax-addf 10616  ax-mulf 10617

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-fal 1550  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-int 4877  df-iun 4921  df-iin 4922  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-se 5515  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-isom 6364  df-riota 7114  df-ov 7159  df-oprab 7160  df-mpo 7161  df-of 7409  df-om 7581  df-1st 7689  df-2nd 7690  df-supp 7831  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-1o 8102  df-2o 8103  df-oadd 8106  df-er 8289  df-map 8408  df-pm 8409  df-ixp 8462  df-en 8510  df-dom 8511  df-sdom 8512  df-fin 8513  df-fsupp 8834  df-fi 8875  df-sup 8906  df-inf 8907  df-oi 8974  df-card 9368  df-pnf 10677  df-mnf 10678  df-xr 10679  df-ltxr 10680  df-le 10681  df-sub 10872  df-neg 10873  df-div 11298  df-nn 11639  df-2 11701  df-3 11702  df-4 11703  df-5 11704  df-6 11705  df-7 11706  df-8 11707  df-9 11708  df-n0 11899  df-z 11983  df-dec 12100  df-uz 12245  df-q 12350  df-rp 12391  df-xneg 12508  df-xadd 12509  df-xmul 12510  df-ioo 12743  df-ioc 12744  df-ico 12745  df-icc 12746  df-fz 12894  df-fzo 13035  df-fl 13163  df-mod 13239  df-seq 13371  df-exp 13431  df-fac 13635  df-bc 13664  df-hash 13692  df-shft 14426  df-cj 14458  df-re 14459  df-im 14460  df-sqrt 14594  df-abs 14595  df-limsup 14828  df-clim 14845  df-rlim 14846  df-sum 15043  df-ef 15421  df-sin 15423  df-cos 15424  df-pi 15426  df-dvds 15608  df-gcd 15844  df-prm 16016  df-pc 16174  df-struct 16485  df-ndx 16486  df-slot 16487  df-base 16489  df-sets 16490  df-ress 16491  df-plusg 16578  df-mulr 16579  df-starv 16580  df-sca 16581  df-vsca 16582  df-ip 16583  df-tset 16584  df-ple 16585  df-ds 16587  df-unif 16588  df-hom 16589  df-cco 16590  df-rest 16696  df-topn 16697  df-0g 16715  df-gsum 16716  df-topgen 16717  df-pt 16718  df-prds 16721  df-xrs 16775  df-qtop 16780  df-imas 16781  df-xps 16783  df-mre 16857  df-mrc 16858  df-acs 16860  df-mgm 17852  df-sgrp 17901  df-mnd 17912  df-submnd 17957  df-mulg 18225  df-cntz 18447  df-cmn 18908  df-psmet 20537  df-xmet 20538  df-met 20539  df-bl 20540  df-mopn 20541  df-fbas 20542  df-fg 20543  df-cnfld 20546  df-top 21502  df-topon 21519  df-topsp 21541  df-bases 21554  df-cld 21627  df-ntr 21628  df-cls 21629  df-nei 21706  df-lp 21744  df-perf 21745  df-cn 21835  df-cnp 21836  df-haus 21923  df-tx 22170  df-hmeo 22363  df-fil 22454  df-fm 22546  df-flim 22547  df-flf 22548  df-xms 22930  df-ms 22931  df-tms 22932  df-cncf 23486  df-limc 24464  df-dv 24465  df-log 25140

This theorem is referenced by:  lighneal  43825