lcmineqlem11 - Mathbox for metakunt

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Theorem lcmineqlem11 42478

Description: Induction step, continuation for binomial coefficients. (Contributed by metakunt, 12-May-2024.)

**Hypotheses**
Ref	Expression
lcmineqlem11.1	⊢ (𝜑 → 𝑀 ∈ ℕ)
lcmineqlem11.2	⊢ (𝜑 → 𝑁 ∈ ℕ)
lcmineqlem11.3	⊢ (𝜑 → 𝑀 < 𝑁)

**Assertion**
Ref	Expression
lcmineqlem11	⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = ((𝑀 / (𝑁 − 𝑀)) · (1 / (𝑀 · (𝑁C𝑀)))))

**Proof of Theorem lcmineqlem11**
Step	Hyp	Ref	Expression
1		lcmineqlem11.1	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑀 ∈ ℕ)
2	1	nncnd 12190	. . . . . . . . . 10 ⊢ (𝜑 → 𝑀 ∈ ℂ)
3		1cnd 11139	. . . . . . . . . 10 ⊢ (𝜑 → 1 ∈ ℂ)
4	2, 3	addcld 11164	. . . . . . . . 9 ⊢ (𝜑 → (𝑀 + 1) ∈ ℂ)
5		lcmineqlem11.2	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑁 ∈ ℕ)
6	1	nnnn0d 12498	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 ∈ ℕ₀)
7		1nn0 12453	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℕ₀
8	7	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → 1 ∈ ℕ₀)
9	6, 8	nn0addcld 12502	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ₀)
10		lcmineqlem11.3	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 < 𝑁)
11	1	nnzd 12550	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ ℤ)
12	5	nnzd 12550	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
13		zltp1le 12577	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
14	11, 12, 13	syl2anc 585	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
15	10, 14	mpbid 232	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ≤ 𝑁)
16	5, 9, 15	bccl2d 42430	. . . . . . . . . 10 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℕ)
17	16	nncnd 12190	. . . . . . . . 9 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℂ)
18	4, 17	mulcld 11165	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ∈ ℂ)
19	18	div1d 11923	. . . . . . 7 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
20	11	peano2zd 12636	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑀 + 1) ∈ ℤ)
21	1	peano2nnd 12191	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ)
22	21	nnge1d 12225	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 1 ≤ (𝑀 + 1))
23	20, 22, 15	3jca 1129	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁))
24		1z 12557	. . . . . . . . . . . . . . . . 17 ⊢ 1 ∈ ℤ
25		elfz1 13466	. . . . . . . . . . . . . . . . 17 ⊢ ((1 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 + 1) ∈ (1...𝑁) ↔ ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁)))
26	24, 25	mpan 691	. . . . . . . . . . . . . . . 16 ⊢ (𝑁 ∈ ℤ → ((𝑀 + 1) ∈ (1...𝑁) ↔ ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁)))
27	12, 26	syl 17	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) ∈ (1...𝑁) ↔ ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁)))
28	23, 27	mpbird 257	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑀 + 1) ∈ (1...𝑁))
29		bcm1k 14277	. . . . . . . . . . . . . 14 ⊢ ((𝑀 + 1) ∈ (1...𝑁) → (𝑁C(𝑀 + 1)) = ((𝑁C((𝑀 + 1) − 1)) · ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1))))
30	28, 29	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = ((𝑁C((𝑀 + 1) − 1)) · ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1))))
31	2, 3	pncand 11506	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) − 1) = 𝑀)
32	31	oveq2d 7383	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C((𝑀 + 1) − 1)) = (𝑁C𝑀))
33	31	oveq2d 7383	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑁 − ((𝑀 + 1) − 1)) = (𝑁 − 𝑀))
34	33	oveq1d 7382	. . . . . . . . . . . . . 14 ⊢ (𝜑 → ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1)) = ((𝑁 − 𝑀) / (𝑀 + 1)))
35	32, 34	oveq12d 7385	. . . . . . . . . . . . 13 ⊢ (𝜑 → ((𝑁C((𝑀 + 1) − 1)) · ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1))) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
36	30, 35	eqtrd 2771	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
37	1	nnred 12189	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑀 ∈ ℝ)
38	5	nnred 12189	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑁 ∈ ℝ)
39	37, 38, 10	ltled 11294	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ≤ 𝑁)
40	5, 6, 39	bccl2d 42430	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℕ)
41	40	nncnd 12190	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℂ)
42	5	nncnd 12190	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑁 ∈ ℂ)
43	42, 2	subcld 11505	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁 − 𝑀) ∈ ℂ)
44	21	nnne0d 12227	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑀 + 1) ≠ 0)
45	41, 43, 4, 44	divassd 11966	. . . . . . . . . . . 12 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
46	36, 45	eqtr4d 2774	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)))
47	46	eqcomd 2742	. . . . . . . . . 10 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = (𝑁C(𝑀 + 1)))
48	41, 43	mulcld 11165	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) ∈ ℂ)
49	48, 17, 4, 44	divmul2d 11964	. . . . . . . . . 10 ⊢ (𝜑 → ((((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = (𝑁C(𝑀 + 1)) ↔ ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑀 + 1) · (𝑁C(𝑀 + 1)))))
50	47, 49	mpbid 232	. . . . . . . . 9 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
51	50	eqcomd 2742	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁C𝑀) · (𝑁 − 𝑀)))
52	41, 43	mulcomd 11166	. . . . . . . 8 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
53	51, 52	eqtrd 2771	. . . . . . 7 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
54	19, 53	eqtrd 2771	. . . . . 6 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
55	43, 41	mulcld 11165	. . . . . . 7 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑁C𝑀)) ∈ ℂ)
56	1	nnne0d 12227	. . . . . . 7 ⊢ (𝜑 → 𝑀 ≠ 0)
57	55, 2, 56	divcan3d 11936	. . . . . 6 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
58	54, 57	eqtr4d 2774	. . . . 5 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀))
59	2, 43, 41	mul12d 11355	. . . . . 6 ⊢ (𝜑 → (𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) = ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))))
60	59	oveq1d 7382	. . . . 5 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
61	58, 60	eqtrd 2771	. . . 4 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
62		0ne1 12252	. . . . . . 7 ⊢ 0 ≠ 1
63	62	a1i 11	. . . . . 6 ⊢ (𝜑 → 0 ≠ 1)
64	63	necomd 2987	. . . . 5 ⊢ (𝜑 → 1 ≠ 0)
65	16	nnne0d 12227	. . . . . 6 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ≠ 0)
66	4, 17, 44, 65	mulne0d 11802	. . . . 5 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ≠ 0)
67	2, 41	mulcld 11165	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ∈ ℂ)
68	43, 67	mulcld 11165	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ∈ ℂ)
69	37, 10	gtned 11281	. . . . . . 7 ⊢ (𝜑 → 𝑁 ≠ 𝑀)
70	42, 2, 69	subne0d 11514	. . . . . 6 ⊢ (𝜑 → (𝑁 − 𝑀) ≠ 0)
71	40	nnne0d 12227	. . . . . . 7 ⊢ (𝜑 → (𝑁C𝑀) ≠ 0)
72	2, 41, 56, 71	mulne0d 11802	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ≠ 0)
73	43, 67, 70, 72	mulne0d 11802	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ≠ 0)
74	3, 64, 18, 66, 2, 56, 68, 73	recbothd 42431	. . . 4 ⊢ (𝜑 → ((1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))) ↔ (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀)))
75	61, 74	mpbird 257	. . 3 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
76	2	mulridd 11162	. . . 4 ⊢ (𝜑 → (𝑀 · 1) = 𝑀)
77	76	oveq1d 7382	. . 3 ⊢ (𝜑 → ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
78	75, 77	eqtr4d 2774	. 2 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
79	2, 43, 3, 67, 70, 72	divmuldivd 11972	. 2 ⊢ (𝜑 → ((𝑀 / (𝑁 − 𝑀)) · (1 / (𝑀 · (𝑁C𝑀)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
80	78, 79	eqtr4d 2774	1 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = ((𝑀 / (𝑁 − 𝑀)) · (1 / (𝑀 · (𝑁C𝑀)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2932 class class class wbr 5085 (class class class)co 7367 0cc0 11038 1c1 11039 + caddc 11041 · cmul 11043 < clt 11179 ≤ cle 11180 − cmin 11377 / cdiv 11807 ℕcn 12174 ℕ₀cn0 12437 ℤcz 12524 ...cfz 13461 Ccbc 14264

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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-div 11808 df-nn 12175 df-n0 12438 df-z 12525 df-uz 12789 df-rp 12943 df-fz 13462 df-seq 13964 df-fac 14236 df-bc 14265

This theorem is referenced by: lcmineqlem13 42480

W3C validator