sge0ltfirp - Mathbox for Glauco Siliprandi

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Theorem sge0ltfirp 43828

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 43816	. . . . 5 ⊢ (𝜑 → ¬ +∞ ∈ ran 𝐹)
5	1, 4	fge0iccico 43798	. . . 4 ⊢ (𝜑 → 𝐹:𝑋⟶(0[,)+∞))
6	5	sge0rnre 43792	. . 3 ⊢ (𝜑 → ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ⊆ ℝ)
7		sge0rnn0 43796	. . . 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 43821	. . 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 42757	. 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 1918	. . 3 ⊢ Ⅎ𝑤𝜑
13		nfv 1918	. . 3 ⊢ Ⅎ𝑤∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌)
14		simp1 1134	. . . . 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 3426	. . . . . . . . . 10 ⊢ 𝑤 ∈ V
16		eqid 2738	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) = (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
17	16	elrnmpt 5854	. . . . . . . . . 10 ⊢ (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	. . . . . . . . 9 ⊢ (𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) ↔ ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
19	18	biimpi 215	. . . . . . . 8 ⊢ (𝑤 ∈ ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
20	19	adantr 480	. . . . . . 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))
21		nfmpt1 5178	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥(𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
22	21	nfrn 5850	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
23		nfcv 2906	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥ℝ
24		nfcv 2906	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥 <
25	22, 23, 24	nfsup 9140	. . . . . . . . . . 11 ⊢ Ⅎ𝑥sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < )
26		nfcv 2906	. . . . . . . . . . 11 ⊢ Ⅎ𝑥 −
27		nfcv 2906	. . . . . . . . . . 11 ⊢ Ⅎ𝑥𝑌
28	25, 26, 27	nfov 7285	. . . . . . . . . 10 ⊢ Ⅎ𝑥(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌)
29		nfcv 2906	. . . . . . . . . 10 ⊢ Ⅎ𝑥𝑤
30	28, 24, 29	nfbr 5117	. . . . . . . . 9 ⊢ Ⅎ𝑥(sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤
31		simpl 482	. . . . . . . . . . . 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)
32		simpr 484	. . . . . . . . . . . 12 ⊢ (((sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌) < 𝑤 ∧ 𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → 𝑤 = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
33	31, 32	breqtrd 5096	. . . . . . . . . . 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))
34	33	ex 412	. . . . . . . . . 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)))
35	34	a1d 25	. . . . . . . . 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))))
36	30, 35	reximdai 3239	. . . . . . . 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)))
37	36	adantl 481	. . . . . . 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)))
38	20, 37	mpd 15	. . . . . 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))
39	38	3adant1 1128	. . . . 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))
40		simpl 482	. . . . . . . . 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)))
41	2, 1, 3	sge0supre 43817	. . . . . . . . . . . . 13 ⊢ (𝜑 → (Σ^{^}‘𝐹) = sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ))
42	41	oveq1d 7270	. . . . . . . . . . . 12 ⊢ (𝜑 → ((Σ^{^}‘𝐹) − 𝑌) = (sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)), ℝ, < ) − 𝑌))
43	42	adantr 480	. . . . . . . . . . 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))
44		simpr 484	. . . . . . . . . . 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))
45	43, 44	eqbrtrd 5092	. . . . . . . . . 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))
46	45	adantlr 711	. . . . . . . . 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))
47		simpr 484	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
48	3	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (Σ^{^}‘𝐹) ∈ ℝ)
49	10	rpred 12701	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑌 ∈ ℝ)
50	49	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑌 ∈ ℝ)
51		elinel2 4126	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) → 𝑥 ∈ Fin)
52	51	adantl 481	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑥 ∈ Fin)
53		rge0ssre 13117	. . . . . . . . . . . . . . 15 ⊢ (0[,)+∞) ⊆ ℝ
54	5	adantr 480	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝐹:𝑋⟶(0[,)+∞))
55	54	adantr 480	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → 𝐹:𝑋⟶(0[,)+∞))
56		elpwinss 42486	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 ∈ (𝒫 𝑋 ∩ Fin) → 𝑥 ⊆ 𝑋)
57	56	adantl 481	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → 𝑥 ⊆ 𝑋)
58	57	sselda 3917	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ 𝑋)
59	55, 58	ffvelrnd 6944	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → (𝐹‘𝑦) ∈ (0[,)+∞))
60	53, 59	sselid 3915	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ 𝑦 ∈ 𝑥) → (𝐹‘𝑦) ∈ ℝ)
61	52, 60	fsumrecl 15374	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) ∈ ℝ)
62	48, 50, 61	ltsubaddd 11501	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) ↔ (Σ^{^}‘𝐹) < (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌)))
63	62	adantr 480	. . . . . . . . . . 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)))
64	47, 63	mpbid 231	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (Σ^{^}‘𝐹) < (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌))
65	54, 57	fssresd 6625	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (𝐹 ↾ 𝑥):𝑥⟶(0[,)+∞))
66	52, 65	sge0fsum 43815	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (Σ^{^}‘(𝐹 ↾ 𝑥)) = Σ𝑦 ∈ 𝑥 ((𝐹 ↾ 𝑥)‘𝑦))
67		fvres 6775	. . . . . . . . . . . . . . 15 ⊢ (𝑦 ∈ 𝑥 → ((𝐹 ↾ 𝑥)‘𝑦) = (𝐹‘𝑦))
68	67	sumeq2i 15339	. . . . . . . . . . . . . 14 ⊢ Σ𝑦 ∈ 𝑥 ((𝐹 ↾ 𝑥)‘𝑦) = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)
69	68	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 ((𝐹 ↾ 𝑥)‘𝑦) = Σ𝑦 ∈ 𝑥 (𝐹‘𝑦))
70	66, 69	eqtr2d 2779	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) = (Σ^{^}‘(𝐹 ↾ 𝑥)))
71	70	oveq1d 7270	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) → (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌) = ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
72	71	adantr 480	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (Σ𝑦 ∈ 𝑥 (𝐹‘𝑦) + 𝑌) = ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
73	64, 72	breqtrd 5096	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝒫 𝑋 ∩ Fin)) ∧ ((Σ^{^}‘𝐹) − 𝑌) < Σ𝑦 ∈ 𝑥 (𝐹‘𝑦)) → (Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))
74	40, 46, 73	syl2anc 583	. . . . . . . 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))
75	74	ex 412	. . . . . . 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)))
76	75	reximdva 3202	. . . . . 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)))
77	76	imp 406	. . . . 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))
78	14, 39, 77	syl2anc 583	. . . 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))
79	78	3exp 1117	. . 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))))
80	12, 13, 79	rexlimd 3245	. 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)))
81	11, 80	mpd 15	1 ⊢ (𝜑 → ∃𝑥 ∈ (𝒫 𝑋 ∩ Fin)(Σ^{^}‘𝐹) < ((Σ^{^}‘(𝐹 ↾ 𝑥)) + 𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ∃wrex 3064 Vcvv 3422 ∩ cin 3882 ⊆ wss 3883 ∅c0 4253 𝒫 cpw 4530 class class class wbr 5070 ↦ cmpt 5153 ran crn 5581 ↾ cres 5582 ⟶wf 6414 ‘cfv 6418 (class class class)co 7255 Fincfn 8691 supcsup 9129 ℝcr 10801 0cc0 10802 + caddc 10805 +∞cpnf 10937 < clt 10940 − cmin 11135 ℝ⁺crp 12659 [,)cico 13010 [,]cicc 13011 Σcsu 15325 Σ^{^}csumge0 43790

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-inf2 9329 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-se 5536 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-isom 6427 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-sup 9131 df-oi 9199 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-n0 12164 df-z 12250 df-uz 12512 df-rp 12660 df-ico 13014 df-icc 13015 df-fz 13169 df-fzo 13312 df-seq 13650 df-exp 13711 df-hash 13973 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-clim 15125 df-sum 15326 df-sumge0 43791

This theorem is referenced by: sge0ltfirpmpt 43836 sge0ltfirpmpt2 43854

W3C validator