isumlessdc - Intuitionistic Logic Explorer

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Theorem isumlessdc 11678

Description: A finite sum of nonnegative numbers is less than or equal to its limit. (Contributed by Mario Carneiro, 24-Apr-2014.)

**Hypotheses**
Ref	Expression
isumless.1	⊢ 𝑍 = (ℤ_≥‘𝑀)
isumless.2	⊢ (𝜑 → 𝑀 ∈ ℤ)
isumless.3	⊢ (𝜑 → 𝐴 ∈ Fin)
isumless.4	⊢ (𝜑 → 𝐴 ⊆ 𝑍)
isumless.5	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = 𝐵)
isumless.dc	⊢ (𝜑 → ∀𝑘 ∈ 𝑍 DECID 𝑘 ∈ 𝐴)
isumless.6	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ∈ ℝ)
isumless.7	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 0 ≤ 𝐵)
isumless.8	⊢ (𝜑 → seq𝑀( + , 𝐹) ∈ dom ⇝ )

**Assertion**
Ref	Expression
isumlessdc	⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 ≤ Σ𝑘 ∈ 𝑍 𝐵)

Distinct variable groups: 𝐴,𝑘 𝑘,𝐹 𝑘,𝑀 𝜑,𝑘 𝑘,𝑍 Allowed substitution hint: 𝐵(𝑘)

Proof of Theorem isumlessdc Dummy variable 𝑗 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		isumless.4	. . 3 ⊢ (𝜑 → 𝐴 ⊆ 𝑍)
2		isumless.dc	. . 3 ⊢ (𝜑 → ∀𝑘 ∈ 𝑍 DECID 𝑘 ∈ 𝐴)
3	1	sselda 3184	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝑘 ∈ 𝑍)
4		isumless.6	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ∈ ℝ)
5	4	recnd 8072	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ∈ ℂ)
6	3, 5	syldan 282	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℂ)
7	6	ralrimiva 2570	. . 3 ⊢ (𝜑 → ∀𝑘 ∈ 𝐴 𝐵 ∈ ℂ)
8		isumless.2	. . . . 5 ⊢ (𝜑 → 𝑀 ∈ ℤ)
9		isumless.1	. . . . . . 7 ⊢ 𝑍 = (ℤ_≥‘𝑀)
10	9	eqimssi 3240	. . . . . 6 ⊢ 𝑍 ⊆ (ℤ_≥‘𝑀)
11	10	a1i 9	. . . . 5 ⊢ (𝜑 → 𝑍 ⊆ (ℤ_≥‘𝑀))
12	9	eleq2i 2263	. . . . . . . . . 10 ⊢ (𝑘 ∈ 𝑍 ↔ 𝑘 ∈ (ℤ_≥‘𝑀))
13	12	biimpri 133	. . . . . . . . 9 ⊢ (𝑘 ∈ (ℤ_≥‘𝑀) → 𝑘 ∈ 𝑍)
14	13	orcd 734	. . . . . . . 8 ⊢ (𝑘 ∈ (ℤ_≥‘𝑀) → (𝑘 ∈ 𝑍 ∨ ¬ 𝑘 ∈ 𝑍))
15		df-dc 836	. . . . . . . 8 ⊢ (DECID 𝑘 ∈ 𝑍 ↔ (𝑘 ∈ 𝑍 ∨ ¬ 𝑘 ∈ 𝑍))
16	14, 15	sylibr 134	. . . . . . 7 ⊢ (𝑘 ∈ (ℤ_≥‘𝑀) → DECID 𝑘 ∈ 𝑍)
17	16	rgen 2550	. . . . . 6 ⊢ ∀𝑘 ∈ (ℤ_≥‘𝑀)DECID 𝑘 ∈ 𝑍
18	17	a1i 9	. . . . 5 ⊢ (𝜑 → ∀𝑘 ∈ (ℤ_≥‘𝑀)DECID 𝑘 ∈ 𝑍)
19	8, 11, 18	3jca 1179	. . . 4 ⊢ (𝜑 → (𝑀 ∈ ℤ ∧ 𝑍 ⊆ (ℤ_≥‘𝑀) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑀)DECID 𝑘 ∈ 𝑍))
20	19	orcd 734	. . 3 ⊢ (𝜑 → ((𝑀 ∈ ℤ ∧ 𝑍 ⊆ (ℤ_≥‘𝑀) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑀)DECID 𝑘 ∈ 𝑍) ∨ 𝑍 ∈ Fin))
21	1, 2, 7, 20	isumss2 11575	. 2 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑘 ∈ 𝑍 if(𝑘 ∈ 𝐴, 𝐵, 0))
22		simpr 110	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝑘 ∈ 𝑍)
23		isumless.5	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = 𝐵)
24	23, 4	eqeltrd 2273	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℝ)
25	24	adantr 276	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑍) ∧ 𝑘 ∈ 𝐴) → (𝐹‘𝑘) ∈ ℝ)
26		0red 8044	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑍) ∧ ¬ 𝑘 ∈ 𝐴) → 0 ∈ ℝ)
27	2	r19.21bi 2585	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → DECID 𝑘 ∈ 𝐴)
28	25, 26, 27	ifcldadc 3591	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → if(𝑘 ∈ 𝐴, (𝐹‘𝑘), 0) ∈ ℝ)
29		eleq1w 2257	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝑗 ∈ 𝐴 ↔ 𝑘 ∈ 𝐴))
30		fveq2 5561	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝐹‘𝑗) = (𝐹‘𝑘))
31	29, 30	ifbieq1d 3584	. . . . . 6 ⊢ (𝑗 = 𝑘 → if(𝑗 ∈ 𝐴, (𝐹‘𝑗), 0) = if(𝑘 ∈ 𝐴, (𝐹‘𝑘), 0))
32		eqid 2196	. . . . . 6 ⊢ (𝑗 ∈ 𝑍 ↦ if(𝑗 ∈ 𝐴, (𝐹‘𝑗), 0)) = (𝑗 ∈ 𝑍 ↦ if(𝑗 ∈ 𝐴, (𝐹‘𝑗), 0))
33	31, 32	fvmptg 5640	. . . . 5 ⊢ ((𝑘 ∈ 𝑍 ∧ if(𝑘 ∈ 𝐴, (𝐹‘𝑘), 0) ∈ ℝ) → ((𝑗 ∈ 𝑍 ↦ if(𝑗 ∈ 𝐴, (𝐹‘𝑗), 0))‘𝑘) = if(𝑘 ∈ 𝐴, (𝐹‘𝑘), 0))
34	22, 28, 33	syl2anc 411	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((𝑗 ∈ 𝑍 ↦ if(𝑗 ∈ 𝐴, (𝐹‘𝑗), 0))‘𝑘) = if(𝑘 ∈ 𝐴, (𝐹‘𝑘), 0))
35	23	ifeq1d 3579	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → if(𝑘 ∈ 𝐴, (𝐹‘𝑘), 0) = if(𝑘 ∈ 𝐴, 𝐵, 0))
36	34, 35	eqtrd 2229	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((𝑗 ∈ 𝑍 ↦ if(𝑗 ∈ 𝐴, (𝐹‘𝑗), 0))‘𝑘) = if(𝑘 ∈ 𝐴, 𝐵, 0))
37	35, 28	eqeltrrd 2274	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → if(𝑘 ∈ 𝐴, 𝐵, 0) ∈ ℝ)
38	4	leidd 8558	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ≤ 𝐵)
39		isumless.7	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 0 ≤ 𝐵)
40		breq1 4037	. . . . 5 ⊢ (𝐵 = if(𝑘 ∈ 𝐴, 𝐵, 0) → (𝐵 ≤ 𝐵 ↔ if(𝑘 ∈ 𝐴, 𝐵, 0) ≤ 𝐵))
41		breq1 4037	. . . . 5 ⊢ (0 = if(𝑘 ∈ 𝐴, 𝐵, 0) → (0 ≤ 𝐵 ↔ if(𝑘 ∈ 𝐴, 𝐵, 0) ≤ 𝐵))
42	40, 41	ifbothdc 3595	. . . 4 ⊢ ((𝐵 ≤ 𝐵 ∧ 0 ≤ 𝐵 ∧ DECID 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐴, 𝐵, 0) ≤ 𝐵)
43	38, 39, 27, 42	syl3anc 1249	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → if(𝑘 ∈ 𝐴, 𝐵, 0) ≤ 𝐵)
44		isumless.3	. . . 4 ⊢ (𝜑 → 𝐴 ∈ Fin)
45	13, 27	sylan2 286	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) → DECID 𝑘 ∈ 𝐴)
46	9, 8, 44, 1, 45, 36, 6	fsum3cvg3 11578	. . 3 ⊢ (𝜑 → seq𝑀( + , (𝑗 ∈ 𝑍 ↦ if(𝑗 ∈ 𝐴, (𝐹‘𝑗), 0))) ∈ dom ⇝ )
47		isumless.8	. . 3 ⊢ (𝜑 → seq𝑀( + , 𝐹) ∈ dom ⇝ )
48	9, 8, 36, 37, 23, 4, 43, 46, 47	isumle 11677	. 2 ⊢ (𝜑 → Σ𝑘 ∈ 𝑍 if(𝑘 ∈ 𝐴, 𝐵, 0) ≤ Σ𝑘 ∈ 𝑍 𝐵)
49	21, 48	eqbrtrd 4056	1 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 ≤ Σ𝑘 ∈ 𝑍 𝐵)

Colors of variables: wff set class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ∨ wo 709 DECID wdc 835 ∧ w3a 980 = wceq 1364 ∈ wcel 2167 ∀wral 2475 ⊆ wss 3157 ifcif 3562 class class class wbr 4034 ↦ cmpt 4095 dom cdm 4664 ‘cfv 5259 Fincfn 6808 ℂcc 7894 ℝcr 7895 0cc0 7896 + caddc 7899 ≤ cle 8079 ℤcz 9343 ℤ_≥cuz 9618 seqcseq 10556 ⇝ cli 11460 Σcsu 11535

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-coll 4149 ax-sep 4152 ax-nul 4160 ax-pow 4208 ax-pr 4243 ax-un 4469 ax-setind 4574 ax-iinf 4625 ax-cnex 7987 ax-resscn 7988 ax-1cn 7989 ax-1re 7990 ax-icn 7991 ax-addcl 7992 ax-addrcl 7993 ax-mulcl 7994 ax-mulrcl 7995 ax-addcom 7996 ax-mulcom 7997 ax-addass 7998 ax-mulass 7999 ax-distr 8000 ax-i2m1 8001 ax-0lt1 8002 ax-1rid 8003 ax-0id 8004 ax-rnegex 8005 ax-precex 8006 ax-cnre 8007 ax-pre-ltirr 8008 ax-pre-ltwlin 8009 ax-pre-lttrn 8010 ax-pre-apti 8011 ax-pre-ltadd 8012 ax-pre-mulgt0 8013 ax-pre-mulext 8014 ax-arch 8015 ax-caucvg 8016

This theorem depends on definitions: df-bi 117 df-dc 836 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-reu 2482 df-rmo 2483 df-rab 2484 df-v 2765 df-sbc 2990 df-csb 3085 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-nul 3452 df-if 3563 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-int 3876 df-iun 3919 df-br 4035 df-opab 4096 df-mpt 4097 df-tr 4133 df-id 4329 df-po 4332 df-iso 4333 df-iord 4402 df-on 4404 df-ilim 4405 df-suc 4407 df-iom 4628 df-xp 4670 df-rel 4671 df-cnv 4672 df-co 4673 df-dm 4674 df-rn 4675 df-res 4676 df-ima 4677 df-iota 5220 df-fun 5261 df-fn 5262 df-f 5263 df-f1 5264 df-fo 5265 df-f1o 5266 df-fv 5267 df-isom 5268 df-riota 5880 df-ov 5928 df-oprab 5929 df-mpo 5930 df-1st 6207 df-2nd 6208 df-recs 6372 df-irdg 6437 df-frec 6458 df-1o 6483 df-oadd 6487 df-er 6601 df-en 6809 df-dom 6810 df-fin 6811 df-sup 7059 df-pnf 8080 df-mnf 8081 df-xr 8082 df-ltxr 8083 df-le 8084 df-sub 8216 df-neg 8217 df-reap 8619 df-ap 8626 df-div 8717 df-inn 9008 df-2 9066 df-3 9067 df-4 9068 df-n0 9267 df-z 9344 df-uz 9619 df-q 9711 df-rp 9746 df-fz 10101 df-fzo 10235 df-seqfrec 10557 df-exp 10648 df-ihash 10885 df-cj 11024 df-re 11025 df-im 11026 df-rsqrt 11180 df-abs 11181 df-clim 11461 df-sumdc 11536

This theorem is referenced by: mertenslemi1 11717

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