lcmineqlem11 - Mathbox for metakunt

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Theorem lcmineqlem11 40044

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 11987	. . . . . . . . . 10 ⊢ (𝜑 → 𝑀 ∈ ℂ)
3		1cnd 10968	. . . . . . . . . 10 ⊢ (𝜑 → 1 ∈ ℂ)
4	2, 3	addcld 10992	. . . . . . . . 9 ⊢ (𝜑 → (𝑀 + 1) ∈ ℂ)
5		lcmineqlem11.2	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑁 ∈ ℕ)
6	1	nnnn0d 12291	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 ∈ ℕ₀)
7		1nn0 12247	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℕ₀
8	7	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → 1 ∈ ℕ₀)
9	6, 8	nn0addcld 12295	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ₀)
10		lcmineqlem11.3	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 < 𝑁)
11	1	nnzd 12423	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ ℤ)
12	5	nnzd 12423	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
13		zltp1le 12368	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
14	11, 12, 13	syl2anc 584	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
15	10, 14	mpbid 231	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ≤ 𝑁)
16	5, 9, 15	bccl2d 39997	. . . . . . . . . 10 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℕ)
17	16	nncnd 11987	. . . . . . . . 9 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℂ)
18	4, 17	mulcld 10993	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ∈ ℂ)
19	18	div1d 11741	. . . . . . 7 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
20	11	peano2zd 12427	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑀 + 1) ∈ ℤ)
21	1	peano2nnd 11988	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ)
22	21	nnge1d 12019	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 1 ≤ (𝑀 + 1))
23	20, 22, 15	3jca 1127	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁))
24		1z 12348	. . . . . . . . . . . . . . . . 17 ⊢ 1 ∈ ℤ
25		elfz1 13242	. . . . . . . . . . . . . . . . 17 ⊢ ((1 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 + 1) ∈ (1...𝑁) ↔ ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁)))
26	24, 25	mpan 687	. . . . . . . . . . . . . . . 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 14027	. . . . . . . . . . . . . 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 11331	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) − 1) = 𝑀)
32	31	oveq2d 7293	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C((𝑀 + 1) − 1)) = (𝑁C𝑀))
33	31	oveq2d 7293	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑁 − ((𝑀 + 1) − 1)) = (𝑁 − 𝑀))
34	33	oveq1d 7292	. . . . . . . . . . . . . 14 ⊢ (𝜑 → ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1)) = ((𝑁 − 𝑀) / (𝑀 + 1)))
35	32, 34	oveq12d 7295	. . . . . . . . . . . . 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 11986	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑀 ∈ ℝ)
38	5	nnred 11986	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑁 ∈ ℝ)
39	37, 38, 10	ltled 11121	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ≤ 𝑁)
40	5, 6, 39	bccl2d 39997	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℕ)
41	40	nncnd 11987	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℂ)
42	5	nncnd 11987	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑁 ∈ ℂ)
43	42, 2	subcld 11330	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁 − 𝑀) ∈ ℂ)
44	21	nnne0d 12021	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑀 + 1) ≠ 0)
45	41, 43, 4, 44	divassd 11784	. . . . . . . . . . . 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 10993	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) ∈ ℂ)
49	48, 17, 4, 44	divmul2d 11782	. . . . . . . . . 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 10994	. . . . . . . 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 10993	. . . . . . 7 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑁C𝑀)) ∈ ℂ)
56	1	nnne0d 12021	. . . . . . 7 ⊢ (𝜑 → 𝑀 ≠ 0)
57	55, 2, 56	divcan3d 11754	. . . . . 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 11182	. . . . . 6 ⊢ (𝜑 → (𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) = ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))))
60	59	oveq1d 7292	. . . . 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 12042	. . . . . . 7 ⊢ 0 ≠ 1
63	62	a1i 11	. . . . . 6 ⊢ (𝜑 → 0 ≠ 1)
64	63	necomd 2999	. . . . 5 ⊢ (𝜑 → 1 ≠ 0)
65	16	nnne0d 12021	. . . . . 6 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ≠ 0)
66	4, 17, 44, 65	mulne0d 11625	. . . . 5 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ≠ 0)
67	2, 41	mulcld 10993	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ∈ ℂ)
68	43, 67	mulcld 10993	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ∈ ℂ)
69	37, 10	gtned 11108	. . . . . . 7 ⊢ (𝜑 → 𝑁 ≠ 𝑀)
70	42, 2, 69	subne0d 11339	. . . . . 6 ⊢ (𝜑 → (𝑁 − 𝑀) ≠ 0)
71	40	nnne0d 12021	. . . . . . 7 ⊢ (𝜑 → (𝑁C𝑀) ≠ 0)
72	2, 41, 56, 71	mulne0d 11625	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ≠ 0)
73	43, 67, 70, 72	mulne0d 11625	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ≠ 0)
74	3, 64, 18, 66, 2, 56, 68, 73	recbothd 39998	. . . 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 10990	. . . 4 ⊢ (𝜑 → (𝑀 · 1) = 𝑀)
77	76	oveq1d 7292	. . 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 11790	. 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 1086 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 class class class wbr 5076 (class class class)co 7277 0cc0 10869 1c1 10870 + caddc 10872 · cmul 10874 < clt 11007 ≤ cle 11008 − cmin 11203 / cdiv 11630 ℕcn 11971 ℕ₀cn0 12231 ℤcz 12317 ...cfz 13237 Ccbc 14014

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5225 ax-nul 5232 ax-pow 5290 ax-pr 5354 ax-un 7588 ax-cnex 10925 ax-resscn 10926 ax-1cn 10927 ax-icn 10928 ax-addcl 10929 ax-addrcl 10930 ax-mulcl 10931 ax-mulrcl 10932 ax-mulcom 10933 ax-addass 10934 ax-mulass 10935 ax-distr 10936 ax-i2m1 10937 ax-1ne0 10938 ax-1rid 10939 ax-rnegex 10940 ax-rrecex 10941 ax-cnre 10942 ax-pre-lttri 10943 ax-pre-lttrn 10944 ax-pre-ltadd 10945 ax-pre-mulgt0 10946

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3433 df-sbc 3718 df-csb 3834 df-dif 3891 df-un 3893 df-in 3895 df-ss 3905 df-pss 3907 df-nul 4259 df-if 4462 df-pw 4537 df-sn 4564 df-pr 4566 df-op 4570 df-uni 4842 df-iun 4928 df-br 5077 df-opab 5139 df-mpt 5160 df-tr 5194 df-id 5491 df-eprel 5497 df-po 5505 df-so 5506 df-fr 5546 df-we 5548 df-xp 5597 df-rel 5598 df-cnv 5599 df-co 5600 df-dm 5601 df-rn 5602 df-res 5603 df-ima 5604 df-pred 6204 df-ord 6271 df-on 6272 df-lim 6273 df-suc 6274 df-iota 6393 df-fun 6437 df-fn 6438 df-f 6439 df-f1 6440 df-fo 6441 df-f1o 6442 df-fv 6443 df-riota 7234 df-ov 7280 df-oprab 7281 df-mpo 7282 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8095 df-wrecs 8126 df-recs 8200 df-rdg 8239 df-er 8496 df-en 8732 df-dom 8733 df-sdom 8734 df-pnf 11009 df-mnf 11010 df-xr 11011 df-ltxr 11012 df-le 11013 df-sub 11205 df-neg 11206 df-div 11631 df-nn 11972 df-n0 12232 df-z 12318 df-uz 12581 df-rp 12729 df-fz 13238 df-seq 13720 df-fac 13986 df-bc 14015

This theorem is referenced by: lcmineqlem13 40046

W3C validator