lcmineqlem11 - Mathbox for metakunt

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Theorem lcmineqlem11 39591

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 11675	. . . . . . . . . 10 ⊢ (𝜑 → 𝑀 ∈ ℂ)
3		1cnd 10659	. . . . . . . . . 10 ⊢ (𝜑 → 1 ∈ ℂ)
4	2, 3	addcld 10683	. . . . . . . . 9 ⊢ (𝜑 → (𝑀 + 1) ∈ ℂ)
5		lcmineqlem11.2	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑁 ∈ ℕ)
6	1	nnnn0d 11979	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 ∈ ℕ₀)
7		1nn0 11935	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℕ₀
8	7	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → 1 ∈ ℕ₀)
9	6, 8	nn0addcld 11983	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ₀)
10		lcmineqlem11.3	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 < 𝑁)
11	1	nnzd 12110	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ ℤ)
12	5	nnzd 12110	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
13		zltp1le 12056	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
14	11, 12, 13	syl2anc 588	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑀 < 𝑁 ↔ (𝑀 + 1) ≤ 𝑁))
15	10, 14	mpbid 235	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ≤ 𝑁)
16	5, 9, 15	bccl2d 39544	. . . . . . . . . 10 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℕ)
17	16	nncnd 11675	. . . . . . . . 9 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℂ)
18	4, 17	mulcld 10684	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ∈ ℂ)
19	18	div1d 11431	. . . . . . 7 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
20	11	peano2zd 12114	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑀 + 1) ∈ ℤ)
21	1	peano2nnd 11676	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ)
22	21	nnge1d 11707	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 1 ≤ (𝑀 + 1))
23	20, 22, 15	3jca 1126	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁))
24		1z 12036	. . . . . . . . . . . . . . . . 17 ⊢ 1 ∈ ℤ
25		elfz1 12929	. . . . . . . . . . . . . . . . 17 ⊢ ((1 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 + 1) ∈ (1...𝑁) ↔ ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁)))
26	24, 25	mpan 690	. . . . . . . . . . . . . . . 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 260	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑀 + 1) ∈ (1...𝑁))
29		bcm1k 13710	. . . . . . . . . . . . . 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 11021	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) − 1) = 𝑀)
32	31	oveq2d 7159	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C((𝑀 + 1) − 1)) = (𝑁C𝑀))
33	31	oveq2d 7159	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑁 − ((𝑀 + 1) − 1)) = (𝑁 − 𝑀))
34	33	oveq1d 7158	. . . . . . . . . . . . . 14 ⊢ (𝜑 → ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1)) = ((𝑁 − 𝑀) / (𝑀 + 1)))
35	32, 34	oveq12d 7161	. . . . . . . . . . . . 13 ⊢ (𝜑 → ((𝑁C((𝑀 + 1) − 1)) · ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1))) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
36	30, 35	eqtrd 2794	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
37	1	nnred 11674	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑀 ∈ ℝ)
38	5	nnred 11674	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑁 ∈ ℝ)
39	37, 38, 10	ltled 10811	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ≤ 𝑁)
40	5, 6, 39	bccl2d 39544	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℕ)
41	40	nncnd 11675	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℂ)
42	5	nncnd 11675	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑁 ∈ ℂ)
43	42, 2	subcld 11020	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁 − 𝑀) ∈ ℂ)
44	21	nnne0d 11709	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑀 + 1) ≠ 0)
45	41, 43, 4, 44	divassd 11474	. . . . . . . . . . . 12 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
46	36, 45	eqtr4d 2797	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)))
47	46	eqcomd 2765	. . . . . . . . . 10 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = (𝑁C(𝑀 + 1)))
48	41, 43	mulcld 10684	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) ∈ ℂ)
49	48, 17, 4, 44	divmul2d 11472	. . . . . . . . . 10 ⊢ (𝜑 → ((((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = (𝑁C(𝑀 + 1)) ↔ ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑀 + 1) · (𝑁C(𝑀 + 1)))))
50	47, 49	mpbid 235	. . . . . . . . 9 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
51	50	eqcomd 2765	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁C𝑀) · (𝑁 − 𝑀)))
52	41, 43	mulcomd 10685	. . . . . . . 8 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
53	51, 52	eqtrd 2794	. . . . . . 7 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
54	19, 53	eqtrd 2794	. . . . . 6 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
55	43, 41	mulcld 10684	. . . . . . 7 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑁C𝑀)) ∈ ℂ)
56	1	nnne0d 11709	. . . . . . 7 ⊢ (𝜑 → 𝑀 ≠ 0)
57	55, 2, 56	divcan3d 11444	. . . . . 6 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
58	54, 57	eqtr4d 2797	. . . . 5 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀))
59	2, 43, 41	mul12d 10872	. . . . . 6 ⊢ (𝜑 → (𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) = ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))))
60	59	oveq1d 7158	. . . . 5 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
61	58, 60	eqtrd 2794	. . . 4 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
62		0ne1 11730	. . . . . . 7 ⊢ 0 ≠ 1
63	62	a1i 11	. . . . . 6 ⊢ (𝜑 → 0 ≠ 1)
64	63	necomd 3004	. . . . 5 ⊢ (𝜑 → 1 ≠ 0)
65	16	nnne0d 11709	. . . . . 6 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ≠ 0)
66	4, 17, 44, 65	mulne0d 11315	. . . . 5 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ≠ 0)
67	2, 41	mulcld 10684	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ∈ ℂ)
68	43, 67	mulcld 10684	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ∈ ℂ)
69	37, 10	gtned 10798	. . . . . . 7 ⊢ (𝜑 → 𝑁 ≠ 𝑀)
70	42, 2, 69	subne0d 11029	. . . . . 6 ⊢ (𝜑 → (𝑁 − 𝑀) ≠ 0)
71	40	nnne0d 11709	. . . . . . 7 ⊢ (𝜑 → (𝑁C𝑀) ≠ 0)
72	2, 41, 56, 71	mulne0d 11315	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ≠ 0)
73	43, 67, 70, 72	mulne0d 11315	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ≠ 0)
74	3, 64, 18, 66, 2, 56, 68, 73	recbothd 39545	. . . 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 260	. . 3 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
76	2	mulid1d 10681	. . . 4 ⊢ (𝜑 → (𝑀 · 1) = 𝑀)
77	76	oveq1d 7158	. . 3 ⊢ (𝜑 → ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
78	75, 77	eqtr4d 2797	. 2 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
79	2, 43, 3, 67, 70, 72	divmuldivd 11480	. 2 ⊢ (𝜑 → ((𝑀 / (𝑁 − 𝑀)) · (1 / (𝑀 · (𝑁C𝑀)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
80	78, 79	eqtr4d 2797	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 209 ∧ w3a 1085 = wceq 1539 ∈ wcel 2112 ≠ wne 2949 class class class wbr 5025 (class class class)co 7143 0cc0 10560 1c1 10561 + caddc 10563 · cmul 10565 < clt 10698 ≤ cle 10699 − cmin 10893 / cdiv 11320 ℕcn 11659 ℕ₀cn0 11919 ℤcz 12005 ...cfz 12924 Ccbc 13697

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 1912 ax-6 1971 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2159 ax-12 2176 ax-ext 2730 ax-sep 5162 ax-nul 5169 ax-pow 5227 ax-pr 5291 ax-un 7452 ax-cnex 10616 ax-resscn 10617 ax-1cn 10618 ax-icn 10619 ax-addcl 10620 ax-addrcl 10621 ax-mulcl 10622 ax-mulrcl 10623 ax-mulcom 10624 ax-addass 10625 ax-mulass 10626 ax-distr 10627 ax-i2m1 10628 ax-1ne0 10629 ax-1rid 10630 ax-rnegex 10631 ax-rrecex 10632 ax-cnre 10633 ax-pre-lttri 10634 ax-pre-lttrn 10635 ax-pre-ltadd 10636 ax-pre-mulgt0 10637

This theorem depends on definitions: df-bi 210 df-an 401 df-or 846 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2071 df-mo 2558 df-eu 2589 df-clab 2737 df-cleq 2751 df-clel 2831 df-nfc 2899 df-ne 2950 df-nel 3054 df-ral 3073 df-rex 3074 df-reu 3075 df-rmo 3076 df-rab 3077 df-v 3409 df-sbc 3694 df-csb 3802 df-dif 3857 df-un 3859 df-in 3861 df-ss 3871 df-pss 3873 df-nul 4222 df-if 4414 df-pw 4489 df-sn 4516 df-pr 4518 df-tp 4520 df-op 4522 df-uni 4792 df-iun 4878 df-br 5026 df-opab 5088 df-mpt 5106 df-tr 5132 df-id 5423 df-eprel 5428 df-po 5436 df-so 5437 df-fr 5476 df-we 5478 df-xp 5523 df-rel 5524 df-cnv 5525 df-co 5526 df-dm 5527 df-rn 5528 df-res 5529 df-ima 5530 df-pred 6119 df-ord 6165 df-on 6166 df-lim 6167 df-suc 6168 df-iota 6287 df-fun 6330 df-fn 6331 df-f 6332 df-f1 6333 df-fo 6334 df-f1o 6335 df-fv 6336 df-riota 7101 df-ov 7146 df-oprab 7147 df-mpo 7148 df-om 7573 df-1st 7686 df-2nd 7687 df-wrecs 7950 df-recs 8011 df-rdg 8049 df-er 8292 df-en 8521 df-dom 8522 df-sdom 8523 df-pnf 10700 df-mnf 10701 df-xr 10702 df-ltxr 10703 df-le 10704 df-sub 10895 df-neg 10896 df-div 11321 df-nn 11660 df-n0 11920 df-z 12006 df-uz 12268 df-rp 12416 df-fz 12925 df-seq 13404 df-fac 13669 df-bc 13698

This theorem is referenced by: lcmineqlem13 39593

W3C validator