sge0ltfirp - Mathbox for Glauco Siliprandi

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Theorem sge0ltfirp 46999

Description: If the sum of nonnegative extended reals is real, then it can be approximated from below by finite subsums. (Contributed by Glauco Siliprandi, 17-Aug-2020.)

**Hypotheses**
Ref	Expression
sge0ltfirp.x	⊢ (𝜑 → 𝑋 ∈ 𝑉)
sge0ltfirp.f	⊢ (𝜑 → 𝐹:𝑋⟶(0[,]+∞))
sge0ltfirp.y	⊢ (𝜑 → 𝑌 ∈ ℝ⁺)
sge0ltfirp.re	⊢ (𝜑 → (Σ^{^}‘𝐹) ∈ ℝ)

**Assertion**
Ref	Expression
sge0ltfirp	⊢ (𝜑 → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))

Distinct variable groups: 𝑥,𝐹 𝑥,𝑋 𝑥,𝑌 𝜑,𝑥 Allowed substitution hint: 𝑉(𝑥)

Proof of Theorem sge0ltfirp Dummy variables 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		sge0ltfirp.f	. . . . 5 ⊢ (𝜑 → 𝐹:𝑋⟶(0[,]+∞))
2		sge0ltfirp.x	. . . . . 6 ⊢ (𝜑 → 𝑋 ∈ 𝑉)
3		sge0ltfirp.re	. . . . . 6 ⊢ (𝜑 → (Σ^{^}‘𝐹) ∈ ℝ)
4	2, 1, 3	sge0rern 46987	. . . . 5 ⊢ (𝜑 → ¬ +∞ ∈ ran 𝐹)
5	1, 4	fge0iccico 46969	. . . 4 ⊢ (𝜑 → 𝐹:𝑋⟶(0[,)+∞))
6	5	sge0rnre 46963	. . 3 ⊢ (𝜑 → ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ⊆ ℝ)
7		sge0rnn0 46967	. . . 4 ⊢ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ≠ ∅
8	7	a1i 11	. . 3 ⊢ (𝜑 → ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ≠ ∅)
9	2, 1, 3	sge0rnbnd 46992	. . 3 ⊢ (𝜑 → ∃𝑧 ∈ ℝ ∀𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))𝑤 ≤ 𝑧)
10		sge0ltfirp.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ ℝ⁺)
11	6, 8, 9, 10	suprltrp 45929	. 2 ⊢ (𝜑 → ∃𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤)
12		nfv 1941	. . 3 ⊢ Ⅎ𝑤𝜑
13		nfv 1941	. . 3 ⊢ Ⅎ𝑤∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌)
14		simp1 1152	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤) → 𝜑)
15		vex 3467	. . . . . . . . 9 ⊢ 𝑤 ∈ V
16		eqid 2769	. . . . . . . . . 10 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) = (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
17	16	elrnmpt 5946	. . . . . . . . 9 ⊢ (𝑤 ∈ V → (𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ↔ ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)))
18	15, 17	ax-mp 5	. . . . . . . 8 ⊢ (𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ↔ ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
19	18	birani 508	. . . . . . 7 ⊢ ((𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
20		nfmpt1 5211	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥(𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
21	20	nfrn 5940	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
22		nfcv 2931	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥ℝ
23		nfcv 2931	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥 <
24	21, 22, 23	nfsup 9407	. . . . . . . . . . 11 ⊢ Ⅎ𝑥sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < )
25		nfcv 2931	. . . . . . . . . . 11 ⊢ Ⅎ𝑥 −
26		nfcv 2931	. . . . . . . . . . 11 ⊢ Ⅎ𝑥𝑌
27	24, 25, 26	nfov 7438	. . . . . . . . . 10 ⊢ Ⅎ𝑥(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌)
28		nfcv 2931	. . . . . . . . . 10 ⊢ Ⅎ𝑥𝑤
29	27, 23, 28	nfbr 5159	. . . . . . . . 9 ⊢ Ⅎ𝑥(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤
30		simpl 487	. . . . . . . . . . . 12 ⊢ (((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 ∧ 𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤)
31		simpr 489	. . . . . . . . . . . 12 ⊢ (((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 ∧ 𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → 𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
32	30, 31	breqtrd 5138	. . . . . . . . . . 11 ⊢ (((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 ∧ 𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
33	32	ex 417	. . . . . . . . . 10 ⊢ ((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 → (𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) → (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)))
34	33	a1d 26	. . . . . . . . 9 ⊢ ((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 → (𝑥 ∈ (𝒫 𝑋 ∩ Fin) → (𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) → (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))))
35	29, 34	reximdai 3273	. . . . . . . 8 ⊢ ((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 → (∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)))
36	35	adantl 486	. . . . . . 7 ⊢ ((𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤) → (∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)))
37	19, 36	mpd 16	. . . . . 6 ⊢ ((𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
38	37	3adant1 1146	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
39		simpl 487	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)))
40	2, 1, 3	sge0supre 46988	. . . . . . . . . . . . 13 ⊢ (𝜑 → (Σ^{^}‘𝐹) = sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ))
41	40	oveq1d 7423	. . . . . . . . . . . 12 ⊢ (𝜑 → ((Σ^{^}‘𝐹) − 𝑌) = (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌))
42	41	adantr 485	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ((Σ^{^}‘𝐹) − 𝑌) = (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌))
43		simpr 489	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
44	42, 43	eqbrtrd 5134	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
45	44	adantlr 727	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
46		simpr 489	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
47	3	adantr 485	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (Σ^{^}‘𝐹) ∈ ℝ)
48	10	rpred 13056	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑌 ∈ ℝ)
49	48	adantr 485	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑌 ∈ ℝ)
50		elinel2 4163	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) → 𝑥 ∈ Fin)
51	50	adantl 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑥 ∈ Fin)
52		rge0ssre 13479	. . . . . . . . . . . . . . 15 ⊢ (0[,)+∞) ⊆ ℝ
53	5	adantr 485	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝐹:𝑋⟶(0[,)+∞))
54	53	adantr 485	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → 𝐹:𝑋⟶(0[,)+∞))
55		elpwinss 45654	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) → 𝑥 ⊆ 𝑋)
56	55	adantl 486	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑥 ⊆ 𝑋)
57	56	sselda 3945	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ 𝑋)
58	54, 57	ffvelcdmd 7078	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → (𝐹‘𝑦) ∈ (0[,)+∞))
59	52, 58	sselid 3943	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → (𝐹‘𝑦) ∈ ℝ)
60	51, 59	fsumrecl 15781	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) ∈ ℝ)
61	47, 49, 60	ltsubaddd 11806	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) ↔ (Σ^{^}‘𝐹) < (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌)))
62	61	adantr 485	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) ↔ (Σ^{^}‘𝐹) < (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌)))
63	46, 62	mpbid 235	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (Σ^{^}‘𝐹) < (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌))
64	53, 56	fssresd 6743	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (𝐹 ↾ 𝑥):𝑥⟶(0[,)+∞))
65	51, 64	sge0fsum 46986	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (Σ^{^}‘(𝐹 ↾ 𝑥)) = Σ𝑦 ∈ 𝑥 ((𝐹 ↾ 𝑥)‘𝑦))
66		fvres 6898	. . . . . . . . . . . . . . 15 ⊢ (𝑦 ∈ 𝑥 → ((𝐹 ↾ 𝑥)‘𝑦) = (𝐹‘𝑦))
67	66	sumeq2i 15745	. . . . . . . . . . . . . 14 ⊢ Σ𝑦 ∈ 𝑥 ((𝐹 ↾ 𝑥)‘𝑦) = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)
68	67	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 ((𝐹 ↾ 𝑥)‘𝑦) = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
69	65, 68	eqtr2d 2805	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) = (Σ^{^}‘(𝐹 ↾ 𝑥)))
70	69	oveq1d 7423	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌) = ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
71	70	adantr 485	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌) = ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
72	63, 71	breqtrd 5138	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
73	39, 45, 72	syl2anc 595	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
74	73	ex 417	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → ((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) → (Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌)))
75	74	reximdva 3184	. . . . . 6 ⊢ (𝜑 → (∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌)))
76	75	imp 411	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
77	14, 38, 76	syl2anc 595	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ∧ (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
78	77	3exp 1135	. . 3 ⊢ (𝜑 → (𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))))
79	12, 13, 78	rexlimd 3278	. 2 ⊢ (𝜑 → (∃𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌)))
80	11, 79	mpd 16	1 ⊢ (𝜑 → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 ∧ w3a 1101 = wceq 1567 ∈ wcel 2149 ≠ wne 2964 ∃wrex 3095 Vcvv 3463 ∩ cin 3912 ⊆ wss 3913 ∅c0 4294 𝒫 cpw 4564 class class class wbr 5110 ↦ cmpt 5193 ran crn 5660 ↾ cres 5661 ⟶wf 6529 ‘cfv 6533 (class class class)co 7408 Fincfn 8939 supcsup 9396 ℝcr 11095 0cc0 11096 + caddc 11099 +∞cpnf 11236 < clt 11239 − cmin 11437 ℝ⁺crp 13012 [,)cico 13370 [,]cicc 13371 Σcsu 15733 Σ^{^}csumge0 46961

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5239 ax-sep 5258 ax-nul 5268 ax-pow 5334 ax-pr 5402 ax-un 7730 ax-inf2 9606 ax-cnex 11152 ax-resscn 11153 ax-1cn 11154 ax-icn 11155 ax-addcl 11156 ax-addrcl 11157 ax-mulcl 11158 ax-mulrcl 11159 ax-mulcom 11160 ax-addass 11161 ax-mulass 11162 ax-distr 11163 ax-i2m1 11164 ax-1ne0 11165 ax-1rid 11166 ax-rnegex 11167 ax-rrecex 11168 ax-cnre 11169 ax-pre-lttri 11170 ax-pre-lttrn 11171 ax-pre-ltadd 11172 ax-pre-mulgt0 11173 ax-pre-sup 11174

This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-int 4914 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-se 5613 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-isom 6542 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-er 8690 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-sup 9398 df-oi 9468 df-card 9921 df-pnf 11241 df-mnf 11242 df-xr 11243 df-ltxr 11244 df-le 11245 df-sub 11439 df-neg 11440 df-div 11868 df-nn 12230 df-2 12299 df-3 12300 df-n0 12501 df-z 12588 df-uz 12859 df-rp 13013 df-ico 13374 df-icc 13375 df-fz 13532 df-fzo 13679 df-seq 14034 df-exp 14094 df-hash 14363 df-cj 15146 df-re 15147 df-im 15148 df-sqrt 15282 df-abs 15283 df-clim 15535 df-sum 15734 df-sumge0 46962

This theorem is referenced by: sge0ltfirpmpt 47007 sge0ltfirpmpt2 47025

W3C validator