lcmineqlem11 - Mathbox for metakunt

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Theorem lcmineqlem11 42052

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 12256	. . . . . . . . . 10 ⊢ (𝜑 → 𝑀 ∈ ℂ)
3		1cnd 11230	. . . . . . . . . 10 ⊢ (𝜑 → 1 ∈ ℂ)
4	2, 3	addcld 11254	. . . . . . . . 9 ⊢ (𝜑 → (𝑀 + 1) ∈ ℂ)
5		lcmineqlem11.2	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑁 ∈ ℕ)
6	1	nnnn0d 12562	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 ∈ ℕ₀)
7		1nn0 12517	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℕ₀
8	7	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → 1 ∈ ℕ₀)
9	6, 8	nn0addcld 12566	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ₀)
10		lcmineqlem11.3	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 < 𝑁)
11	1	nnzd 12615	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ ℤ)
12	5	nnzd 12615	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
13		zltp1le 12642	. . . . . . . . . . . . 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 232	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 + 1) ≤ 𝑁)
16	5, 9, 15	bccl2d 42004	. . . . . . . . . 10 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℕ)
17	16	nncnd 12256	. . . . . . . . 9 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ∈ ℂ)
18	4, 17	mulcld 11255	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ∈ ℂ)
19	18	div1d 12009	. . . . . . 7 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 + 1) · (𝑁C(𝑀 + 1))))
20	11	peano2zd 12700	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑀 + 1) ∈ ℤ)
21	1	peano2nnd 12257	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝑀 + 1) ∈ ℕ)
22	21	nnge1d 12288	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 1 ≤ (𝑀 + 1))
23	20, 22, 15	3jca 1128	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) ∈ ℤ ∧ 1 ≤ (𝑀 + 1) ∧ (𝑀 + 1) ≤ 𝑁))
24		1z 12622	. . . . . . . . . . . . . . . . 17 ⊢ 1 ∈ ℤ
25		elfz1 13529	. . . . . . . . . . . . . . . . 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 257	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑀 + 1) ∈ (1...𝑁))
29		bcm1k 14333	. . . . . . . . . . . . . 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 11595	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ((𝑀 + 1) − 1) = 𝑀)
32	31	oveq2d 7421	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C((𝑀 + 1) − 1)) = (𝑁C𝑀))
33	31	oveq2d 7421	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑁 − ((𝑀 + 1) − 1)) = (𝑁 − 𝑀))
34	33	oveq1d 7420	. . . . . . . . . . . . . 14 ⊢ (𝜑 → ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1)) = ((𝑁 − 𝑀) / (𝑀 + 1)))
35	32, 34	oveq12d 7423	. . . . . . . . . . . . 13 ⊢ (𝜑 → ((𝑁C((𝑀 + 1) − 1)) · ((𝑁 − ((𝑀 + 1) − 1)) / (𝑀 + 1))) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
36	30, 35	eqtrd 2770	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
37	1	nnred 12255	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑀 ∈ ℝ)
38	5	nnred 12255	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑁 ∈ ℝ)
39	37, 38, 10	ltled 11383	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ≤ 𝑁)
40	5, 6, 39	bccl2d 42004	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℕ)
41	40	nncnd 12256	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁C𝑀) ∈ ℂ)
42	5	nncnd 12256	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑁 ∈ ℂ)
43	42, 2	subcld 11594	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑁 − 𝑀) ∈ ℂ)
44	21	nnne0d 12290	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑀 + 1) ≠ 0)
45	41, 43, 4, 44	divassd 12052	. . . . . . . . . . . 12 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = ((𝑁C𝑀) · ((𝑁 − 𝑀) / (𝑀 + 1))))
46	36, 45	eqtr4d 2773	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) = (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)))
47	46	eqcomd 2741	. . . . . . . . . 10 ⊢ (𝜑 → (((𝑁C𝑀) · (𝑁 − 𝑀)) / (𝑀 + 1)) = (𝑁C(𝑀 + 1)))
48	41, 43	mulcld 11255	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) ∈ ℂ)
49	48, 17, 4, 44	divmul2d 12050	. . . . . . . . . 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 2741	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁C𝑀) · (𝑁 − 𝑀)))
52	41, 43	mulcomd 11256	. . . . . . . 8 ⊢ (𝜑 → ((𝑁C𝑀) · (𝑁 − 𝑀)) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
53	51, 52	eqtrd 2770	. . . . . . 7 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
54	19, 53	eqtrd 2770	. . . . . 6 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
55	43, 41	mulcld 11255	. . . . . . 7 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑁C𝑀)) ∈ ℂ)
56	1	nnne0d 12290	. . . . . . 7 ⊢ (𝜑 → 𝑀 ≠ 0)
57	55, 2, 56	divcan3d 12022	. . . . . 6 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = ((𝑁 − 𝑀) · (𝑁C𝑀)))
58	54, 57	eqtr4d 2773	. . . . 5 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀))
59	2, 43, 41	mul12d 11444	. . . . . 6 ⊢ (𝜑 → (𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) = ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))))
60	59	oveq1d 7420	. . . . 5 ⊢ (𝜑 → ((𝑀 · ((𝑁 − 𝑀) · (𝑁C𝑀))) / 𝑀) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
61	58, 60	eqtrd 2770	. . . 4 ⊢ (𝜑 → (((𝑀 + 1) · (𝑁C(𝑀 + 1))) / 1) = (((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) / 𝑀))
62		0ne1 12311	. . . . . . 7 ⊢ 0 ≠ 1
63	62	a1i 11	. . . . . 6 ⊢ (𝜑 → 0 ≠ 1)
64	63	necomd 2987	. . . . 5 ⊢ (𝜑 → 1 ≠ 0)
65	16	nnne0d 12290	. . . . . 6 ⊢ (𝜑 → (𝑁C(𝑀 + 1)) ≠ 0)
66	4, 17, 44, 65	mulne0d 11889	. . . . 5 ⊢ (𝜑 → ((𝑀 + 1) · (𝑁C(𝑀 + 1))) ≠ 0)
67	2, 41	mulcld 11255	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ∈ ℂ)
68	43, 67	mulcld 11255	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ∈ ℂ)
69	37, 10	gtned 11370	. . . . . . 7 ⊢ (𝜑 → 𝑁 ≠ 𝑀)
70	42, 2, 69	subne0d 11603	. . . . . 6 ⊢ (𝜑 → (𝑁 − 𝑀) ≠ 0)
71	40	nnne0d 12290	. . . . . . 7 ⊢ (𝜑 → (𝑁C𝑀) ≠ 0)
72	2, 41, 56, 71	mulne0d 11889	. . . . . 6 ⊢ (𝜑 → (𝑀 · (𝑁C𝑀)) ≠ 0)
73	43, 67, 70, 72	mulne0d 11889	. . . . 5 ⊢ (𝜑 → ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀))) ≠ 0)
74	3, 64, 18, 66, 2, 56, 68, 73	recbothd 42005	. . . 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 11252	. . . 4 ⊢ (𝜑 → (𝑀 · 1) = 𝑀)
77	76	oveq1d 7420	. . 3 ⊢ (𝜑 → ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))) = (𝑀 / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
78	75, 77	eqtr4d 2773	. 2 ⊢ (𝜑 → (1 / ((𝑀 + 1) · (𝑁C(𝑀 + 1)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
79	2, 43, 3, 67, 70, 72	divmuldivd 12058	. 2 ⊢ (𝜑 → ((𝑀 / (𝑁 − 𝑀)) · (1 / (𝑀 · (𝑁C𝑀)))) = ((𝑀 · 1) / ((𝑁 − 𝑀) · (𝑀 · (𝑁C𝑀)))))
80	78, 79	eqtr4d 2773	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 1086 = wceq 1540 ∈ wcel 2108 ≠ wne 2932 class class class wbr 5119 (class class class)co 7405 0cc0 11129 1c1 11130 + caddc 11132 · cmul 11134 < clt 11269 ≤ cle 11270 − cmin 11466 / cdiv 11894 ℕcn 12240 ℕ₀cn0 12501 ℤcz 12588 ...cfz 13524 Ccbc 14320

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2707 ax-sep 5266 ax-nul 5276 ax-pow 5335 ax-pr 5402 ax-un 7729 ax-cnex 11185 ax-resscn 11186 ax-1cn 11187 ax-icn 11188 ax-addcl 11189 ax-addrcl 11190 ax-mulcl 11191 ax-mulrcl 11192 ax-mulcom 11193 ax-addass 11194 ax-mulass 11195 ax-distr 11196 ax-i2m1 11197 ax-1ne0 11198 ax-1rid 11199 ax-rnegex 11200 ax-rrecex 11201 ax-cnre 11202 ax-pre-lttri 11203 ax-pre-lttrn 11204 ax-pre-ltadd 11205 ax-pre-mulgt0 11206

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3359 df-reu 3360 df-rab 3416 df-v 3461 df-sbc 3766 df-csb 3875 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-pss 3946 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-iun 4969 df-br 5120 df-opab 5182 df-mpt 5202 df-tr 5230 df-id 5548 df-eprel 5553 df-po 5561 df-so 5562 df-fr 5606 df-we 5608 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-pred 6290 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6484 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7362 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7862 df-1st 7988 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-er 8719 df-en 8960 df-dom 8961 df-sdom 8962 df-pnf 11271 df-mnf 11272 df-xr 11273 df-ltxr 11274 df-le 11275 df-sub 11468 df-neg 11469 df-div 11895 df-nn 12241 df-n0 12502 df-z 12589 df-uz 12853 df-rp 13009 df-fz 13525 df-seq 14020 df-fac 14292 df-bc 14321

This theorem is referenced by: lcmineqlem13 42054

W3C validator