lcmineqlem11 - Mathbox for metakunt

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Theorem lcmineqlem11 39975

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 11919	. . . . . . . . . 10 ⊢ (𝜑 → 𝑀 ∈ ℂ)
3		1cnd 10901	. . . . . . . . . 10 ⊢ (𝜑 → 1 ∈ ℂ)
4	2, 3	addcld 10925	. . . . . . . . 9 ⊢ (𝜑 → (𝑀 + 1) ∈ ℂ)
5		lcmineqlem11.2	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑁 ∈ ℕ)
6	1	nnnn0d 12223	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 ∈ ℕ₀)
7		1nn0 12179	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℕ₀
8	7	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → 1 ∈ ℕ₀)
9	6, 8	nn0addcld 12227	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ₀)
10		lcmineqlem11.3	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 < 𝑁)
11	1	nnzd 12354	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ ℤ)
12	5	nnzd 12354	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
13		zltp1le 12300	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
14	11, 12, 13	syl2anc 583	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
15	10, 14	mpbid 231	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ≤ 𝑁)
16	5, 9, 15	bccl2d 39928	. . . . . . . . . 10 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℕ)
17	16	nncnd 11919	. . . . . . . . 9 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℂ)
18	4, 17	mulcld 10926	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ∈ ℂ)
19	18	div1d 11673	. . . . . . 7 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
20	11	peano2zd 12358	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑀 + 1) ∈ ℤ)
21	1	peano2nnd 11920	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ)
22	21	nnge1d 11951	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 1 ≤ (𝑀 + 1))
23	20, 22, 15	3jca 1126	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁))
24		1z 12280	. . . . . . . . . . . . . . . . 17 ⊢ 1 ∈ ℤ
25		elfz1 13173	. . . . . . . . . . . . . . . . 17 ⊢ ((1 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 + 1) ∈ (1...𝑁) ↔ ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁)))
26	24, 25	mpan 686	. . . . . . . . . . . . . . . 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 256	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑀 + 1) ∈ (1...𝑁))
29		bcm1k 13957	. . . . . . . . . . . . . 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 11263	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) − 1) = 𝑀)
32	31	oveq2d 7271	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C((𝑀 + 1) − 1)) = (𝑁C𝑀))
33	31	oveq2d 7271	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑁 − ((𝑀 + 1) − 1)) = (𝑁 − 𝑀))
34	33	oveq1d 7270	. . . . . . . . . . . . . 14 ⊢ (𝜑 → ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1)) = ((𝑁 − 𝑀) / (𝑀 + 1)))
35	32, 34	oveq12d 7273	. . . . . . . . . . . . 13 ⊢ (𝜑 → ((𝑁C((𝑀 + 1) − 1)) · ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1))) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
36	30, 35	eqtrd 2778	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
37	1	nnred 11918	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑀 ∈ ℝ)
38	5	nnred 11918	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑁 ∈ ℝ)
39	37, 38, 10	ltled 11053	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ≤ 𝑁)
40	5, 6, 39	bccl2d 39928	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℕ)
41	40	nncnd 11919	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℂ)
42	5	nncnd 11919	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑁 ∈ ℂ)
43	42, 2	subcld 11262	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁 − 𝑀) ∈ ℂ)
44	21	nnne0d 11953	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑀 + 1) ≠ 0)
45	41, 43, 4, 44	divassd 11716	. . . . . . . . . . . 12 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
46	36, 45	eqtr4d 2781	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)))
47	46	eqcomd 2744	. . . . . . . . . 10 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = (𝑁C(𝑀 + 1)))
48	41, 43	mulcld 10926	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) ∈ ℂ)
49	48, 17, 4, 44	divmul2d 11714	. . . . . . . . . 10 ⊢ (𝜑 → ((((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = (𝑁C(𝑀 + 1)) ↔ ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑀 + 1) · (𝑁C(𝑀 + 1)))))
50	47, 49	mpbid 231	. . . . . . . . 9 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
51	50	eqcomd 2744	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁C𝑀) · (𝑁 − 𝑀)))
52	41, 43	mulcomd 10927	. . . . . . . 8 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
53	51, 52	eqtrd 2778	. . . . . . 7 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
54	19, 53	eqtrd 2778	. . . . . 6 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
55	43, 41	mulcld 10926	. . . . . . 7 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑁C𝑀)) ∈ ℂ)
56	1	nnne0d 11953	. . . . . . 7 ⊢ (𝜑 → 𝑀 ≠ 0)
57	55, 2, 56	divcan3d 11686	. . . . . 6 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
58	54, 57	eqtr4d 2781	. . . . 5 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀))
59	2, 43, 41	mul12d 11114	. . . . . 6 ⊢ (𝜑 → (𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) = ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))))
60	59	oveq1d 7270	. . . . 5 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
61	58, 60	eqtrd 2778	. . . 4 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
62		0ne1 11974	. . . . . . 7 ⊢ 0 ≠ 1
63	62	a1i 11	. . . . . 6 ⊢ (𝜑 → 0 ≠ 1)
64	63	necomd 2998	. . . . 5 ⊢ (𝜑 → 1 ≠ 0)
65	16	nnne0d 11953	. . . . . 6 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ≠ 0)
66	4, 17, 44, 65	mulne0d 11557	. . . . 5 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ≠ 0)
67	2, 41	mulcld 10926	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ∈ ℂ)
68	43, 67	mulcld 10926	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ∈ ℂ)
69	37, 10	gtned 11040	. . . . . . 7 ⊢ (𝜑 → 𝑁 ≠ 𝑀)
70	42, 2, 69	subne0d 11271	. . . . . 6 ⊢ (𝜑 → (𝑁 − 𝑀) ≠ 0)
71	40	nnne0d 11953	. . . . . . 7 ⊢ (𝜑 → (𝑁C𝑀) ≠ 0)
72	2, 41, 56, 71	mulne0d 11557	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ≠ 0)
73	43, 67, 70, 72	mulne0d 11557	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ≠ 0)
74	3, 64, 18, 66, 2, 56, 68, 73	recbothd 39929	. . . 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 256	. . 3 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
76	2	mulid1d 10923	. . . 4 ⊢ (𝜑 → (𝑀 · 1) = 𝑀)
77	76	oveq1d 7270	. . 3 ⊢ (𝜑 → ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
78	75, 77	eqtr4d 2781	. 2 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
79	2, 43, 3, 67, 70, 72	divmuldivd 11722	. 2 ⊢ (𝜑 → ((𝑀 / (𝑁 − 𝑀)) · (1 / (𝑀 · (𝑁C𝑀)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
80	78, 79	eqtr4d 2781	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 205 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 class class class wbr 5070 (class class class)co 7255 0cc0 10802 1c1 10803 + caddc 10805 · cmul 10807 < clt 10940 ≤ cle 10941 − cmin 11135 / cdiv 11562 ℕcn 11903 ℕ₀cn0 12163 ℤcz 12249 ...cfz 13168 Ccbc 13944

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-n0 12164 df-z 12250 df-uz 12512 df-rp 12660 df-fz 13169 df-seq 13650 df-fac 13916 df-bc 13945

This theorem is referenced by: lcmineqlem13 39977

W3C validator