sge0ltfirp - Mathbox for Glauco Siliprandi

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Theorem sge0ltfirp 47097

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 47085	. . . . 5 ⊢ (𝜑 → ¬ +∞ ∈ ran 𝐹)
5	1, 4	fge0iccico 47067	. . . 4 ⊢ (𝜑 → 𝐹:𝑋⟶(0[,)+∞))
6	5	sge0rnre 47061	. . 3 ⊢ (𝜑 → ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ⊆ ℝ)
7		sge0rnn0 47065	. . . 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 47090	. . 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 46027	. 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 1944	. . 3 ⊢ Ⅎ𝑤𝜑
13		nfv 1944	. . 3 ⊢ Ⅎ𝑤∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌)
14		simp1 1154	. . . . 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 3459	. . . . . . . . 9 ⊢ 𝑤 ∈ V
16		eqid 2763	. . . . . . . . . 10 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) = (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
17	16	elrnmpt 5950	. . . . . . . . 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 5944	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
22		nfcv 2925	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥ℝ
23		nfcv 2925	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥 <
24	21, 22, 23	nfsup 9412	. . . . . . . . . . 11 ⊢ Ⅎ𝑥sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < )
25		nfcv 2925	. . . . . . . . . . 11 ⊢ Ⅎ𝑥 −
26		nfcv 2925	. . . . . . . . . . 11 ⊢ Ⅎ𝑥𝑌
27	24, 25, 26	nfov 7442	. . . . . . . . . 10 ⊢ Ⅎ𝑥(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌)
28		nfcv 2925	. . . . . . . . . 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 3267	. . . . . . . 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 1148	. . . . 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 47086	. . . . . . . . . . . . 13 ⊢ (𝜑 → (Σ^{^}‘𝐹) = sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ))
41	40	oveq1d 7427	. . . . . . . . . . . 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 13061	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑌 ∈ ℝ)
49	48	adantr 485	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑌 ∈ ℝ)
50		elinel2 4156	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) → 𝑥 ∈ Fin)
51	50	adantl 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑥 ∈ Fin)
52		rge0ssre 13484	. . . . . . . . . . . . . . 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 45752	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) → 𝑥 ⊆ 𝑋)
56	55	adantl 486	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑥 ⊆ 𝑋)
57	56	sselda 3938	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ 𝑋)
58	54, 57	ffvelcdmd 7082	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → (𝐹‘𝑦) ∈ (0[,)+∞))
59	52, 58	sselid 3936	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → (𝐹‘𝑦) ∈ ℝ)
60	51, 59	fsumrecl 15787	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) ∈ ℝ)
61	47, 49, 60	ltsubaddd 11811	. . . . . . . . . . . 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 6747	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (𝐹 ↾ 𝑥):𝑥⟶(0[,)+∞))
65	51, 64	sge0fsum 47084	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (Σ^{^}‘(𝐹 ↾ 𝑥)) = Σ𝑦 ∈ 𝑥 ((𝐹 ↾ 𝑥)‘𝑦))
66		fvres 6902	. . . . . . . . . . . . . . 15 ⊢ (𝑦 ∈ 𝑥 → ((𝐹 ↾ 𝑥)‘𝑦) = (𝐹‘𝑦))
67	66	sumeq2i 15751	. . . . . . . . . . . . . 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 2799	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) = (Σ^{^}‘(𝐹 ↾ 𝑥)))
70	69	oveq1d 7427	. . . . . . . . . . 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 3178	. . . . . 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 1137	. . 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 3272	. 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 1103 = wceq 1570 ∈ wcel 2143 ≠ wne 2958 ∃wrex 3089 Vcvv 3455 ∩ cin 3905 ⊆ wss 3906 ∅c0 4287 𝒫 cpw 4563 class class class wbr 5110 ↦ cmpt 5193 ran crn 5664 ↾ cres 5665 ⟶wf 6534 ‘cfv 6538 (class class class)co 7412 Fincfn 8944 supcsup 9401 ℝcr 11100 0cc0 11101 + caddc 11104 +∞cpnf 11241 < clt 11244 − cmin 11442 ℝ⁺crp 13017 [,)cico 13375 [,]cicc 13376 Σcsu 15739 Σ^{^}csumge0 47059

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-rep 5239 ax-sep 5258 ax-nul 5270 ax-pow 5338 ax-pr 5406 ax-un 7734 ax-inf2 9611 ax-cnex 11157 ax-resscn 11158 ax-1cn 11159 ax-icn 11160 ax-addcl 11161 ax-addrcl 11162 ax-mulcl 11163 ax-mulrcl 11164 ax-mulcom 11165 ax-addass 11166 ax-mulass 11167 ax-distr 11168 ax-i2m1 11169 ax-1ne0 11170 ax-1rid 11171 ax-rnegex 11172 ax-rrecex 11173 ax-cnre 11174 ax-pre-lttri 11175 ax-pre-lttrn 11176 ax-pre-ltadd 11177 ax-pre-mulgt0 11178 ax-pre-sup 11179

This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3746 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4489 df-pw 4565 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-int 4914 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-se 5617 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-isom 6547 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7864 df-1st 7987 df-2nd 7988 df-frecs 8279 df-wrecs 8310 df-recs 8359 df-rdg 8398 df-1o 8454 df-er 8695 df-en 8945 df-dom 8946 df-sdom 8947 df-fin 8948 df-sup 9403 df-oi 9473 df-card 9926 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11444 df-neg 11445 df-div 11873 df-nn 12235 df-2 12304 df-3 12305 df-n0 12506 df-z 12593 df-uz 12864 df-rp 13018 df-ico 13379 df-icc 13380 df-fz 13537 df-fzo 13685 df-seq 14040 df-exp 14100 df-hash 14369 df-cj 15152 df-re 15153 df-im 15154 df-sqrt 15288 df-abs 15289 df-clim 15541 df-sum 15740 df-sumge0 47060

This theorem is referenced by: sge0ltfirpmpt 47105 sge0ltfirpmpt2 47123

W3C validator