Theorem stoweidlem2 46430

Description: lemma for stoweid 46491: here we prove that the subalgebra of continuous functions, which contains constant functions, is closed under scaling. (Contributed by Glauco Siliprandi, 20-Apr-2017.)

Hypotheses

Ref	Expression
stoweidlem2.1	⊢ Ⅎ𝑡𝜑
stoweidlem2.2	⊢ ((𝜑 ∧ 𝑓 ∈ 𝐴 ∧ 𝑔 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝑔‘𝑡))) ∈ 𝐴)
stoweidlem2.3	⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (𝑡 ∈ 𝑇 ↦ 𝑥) ∈ 𝐴)
stoweidlem2.4	⊢ ((𝜑 ∧ 𝑓 ∈ 𝐴) → 𝑓:𝑇⟶ℝ)
stoweidlem2.5	⊢ (𝜑 → 𝐸 ∈ ℝ)
stoweidlem2.6	⊢ (𝜑 → 𝐹 ∈ 𝐴)

Assertion

Ref	Expression
stoweidlem2	⊢ (𝜑 → (𝑡 ∈ 𝑇 ↦ (𝐸 · (𝐹‘𝑡))) ∈ 𝐴)

Distinct variable groups:   𝑓,𝑔,𝑡,𝐹   𝑓,𝐸,𝑡   𝐴,𝑓,𝑔   𝑇,𝑓,𝑔,𝑡   𝜑,𝑓,𝑔   𝑥,𝑡,𝐸   𝑥,𝐴   𝑥,𝑇   𝜑,𝑥

Allowed substitution hints:   𝜑(𝑡)   𝐴(𝑡)   𝐸(𝑔)   𝐹(𝑥)

Proof of Theorem stoweidlem2

Dummy variable 𝑠 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		stoweidlem2.1	. . 3 ⊢ Ⅎ𝑡𝜑
2		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝑇) → 𝑡 ∈ 𝑇)
3		stoweidlem2.5	. . . . . . 7 ⊢ (𝜑 → 𝐸 ∈ ℝ)
4	3	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝑇) → 𝐸 ∈ ℝ)
5		eqidd 2737	. . . . . . . 8 ⊢ (𝑠 = 𝑡 → 𝐸 = 𝐸)
6	5	cbvmptv 5189	. . . . . . 7 ⊢ (𝑠 ∈ 𝑇 ↦ 𝐸) = (𝑡 ∈ 𝑇 ↦ 𝐸)
7	6	fvmpt2 6959	. . . . . 6 ⊢ ((𝑡 ∈ 𝑇 ∧ 𝐸 ∈ ℝ) → ((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) = 𝐸)
8	2, 4, 7	syl2anc 585	. . . . 5 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝑇) → ((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) = 𝐸)
9	8	eqcomd 2742	. . . 4 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝑇) → 𝐸 = ((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡))
10	9	oveq1d 7382	. . 3 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝑇) → (𝐸 · (𝐹‘𝑡)) = (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡)))
11	1, 10	mpteq2da 5177	. 2 ⊢ (𝜑 → (𝑡 ∈ 𝑇 ↦ (𝐸 · (𝐹‘𝑡))) = (𝑡 ∈ 𝑇 ↦ (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡))))
12		id 22	. . . . . . . . 9 ⊢ (𝑥 = 𝐸 → 𝑥 = 𝐸)
13	12	mpteq2dv 5179	. . . . . . . 8 ⊢ (𝑥 = 𝐸 → (𝑡 ∈ 𝑇 ↦ 𝑥) = (𝑡 ∈ 𝑇 ↦ 𝐸))
14	13	eleq1d 2821	. . . . . . 7 ⊢ (𝑥 = 𝐸 → ((𝑡 ∈ 𝑇 ↦ 𝑥) ∈ 𝐴 ↔ (𝑡 ∈ 𝑇 ↦ 𝐸) ∈ 𝐴))
15	14	imbi2d 340	. . . . . 6 ⊢ (𝑥 = 𝐸 → ((𝜑 → (𝑡 ∈ 𝑇 ↦ 𝑥) ∈ 𝐴) ↔ (𝜑 → (𝑡 ∈ 𝑇 ↦ 𝐸) ∈ 𝐴)))
16		stoweidlem2.3	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (𝑡 ∈ 𝑇 ↦ 𝑥) ∈ 𝐴)
17	16	expcom 413	. . . . . 6 ⊢ (𝑥 ∈ ℝ → (𝜑 → (𝑡 ∈ 𝑇 ↦ 𝑥) ∈ 𝐴))
18	15, 17	vtoclga 3520	. . . . 5 ⊢ (𝐸 ∈ ℝ → (𝜑 → (𝑡 ∈ 𝑇 ↦ 𝐸) ∈ 𝐴))
19	3, 18	mpcom 38	. . . 4 ⊢ (𝜑 → (𝑡 ∈ 𝑇 ↦ 𝐸) ∈ 𝐴)
20	6, 19	eqeltrid 2840	. . 3 ⊢ (𝜑 → (𝑠 ∈ 𝑇 ↦ 𝐸) ∈ 𝐴)
21		fveq1 6839	. . . . . . . 8 ⊢ (𝑓 = (𝑠 ∈ 𝑇 ↦ 𝐸) → (𝑓‘𝑡) = ((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡))
22	21	oveq1d 7382	. . . . . . 7 ⊢ (𝑓 = (𝑠 ∈ 𝑇 ↦ 𝐸) → ((𝑓‘𝑡) · (𝐹‘𝑡)) = (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡)))
23	22	mpteq2dv 5179	. . . . . 6 ⊢ (𝑓 = (𝑠 ∈ 𝑇 ↦ 𝐸) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) = (𝑡 ∈ 𝑇 ↦ (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡))))
24	23	eleq1d 2821	. . . . 5 ⊢ (𝑓 = (𝑠 ∈ 𝑇 ↦ 𝐸) → ((𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴 ↔ (𝑡 ∈ 𝑇 ↦ (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴))
25	24	imbi2d 340	. . . 4 ⊢ (𝑓 = (𝑠 ∈ 𝑇 ↦ 𝐸) → ((𝜑 → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴) ↔ (𝜑 → (𝑡 ∈ 𝑇 ↦ (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴)))
26		stoweidlem2.6	. . . . . . 7 ⊢ (𝜑 → 𝐹 ∈ 𝐴)
27	26	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑓 ∈ 𝐴) → 𝐹 ∈ 𝐴)
28		fveq1 6839	. . . . . . . . . . 11 ⊢ (𝑔 = 𝐹 → (𝑔‘𝑡) = (𝐹‘𝑡))
29	28	oveq2d 7383	. . . . . . . . . 10 ⊢ (𝑔 = 𝐹 → ((𝑓‘𝑡) · (𝑔‘𝑡)) = ((𝑓‘𝑡) · (𝐹‘𝑡)))
30	29	mpteq2dv 5179	. . . . . . . . 9 ⊢ (𝑔 = 𝐹 → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝑔‘𝑡))) = (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))))
31	30	eleq1d 2821	. . . . . . . 8 ⊢ (𝑔 = 𝐹 → ((𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝑔‘𝑡))) ∈ 𝐴 ↔ (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴))
32	31	imbi2d 340	. . . . . . 7 ⊢ (𝑔 = 𝐹 → (((𝜑 ∧ 𝑓 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝑔‘𝑡))) ∈ 𝐴) ↔ ((𝜑 ∧ 𝑓 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴)))
33		stoweidlem2.2	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑓 ∈ 𝐴 ∧ 𝑔 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝑔‘𝑡))) ∈ 𝐴)
34	33	3comr 1126	. . . . . . . 8 ⊢ ((𝑔 ∈ 𝐴 ∧ 𝜑 ∧ 𝑓 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝑔‘𝑡))) ∈ 𝐴)
35	34	3expib 1123	. . . . . . 7 ⊢ (𝑔 ∈ 𝐴 → ((𝜑 ∧ 𝑓 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝑔‘𝑡))) ∈ 𝐴))
36	32, 35	vtoclga 3520	. . . . . 6 ⊢ (𝐹 ∈ 𝐴 → ((𝜑 ∧ 𝑓 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴))
37	27, 36	mpcom 38	. . . . 5 ⊢ ((𝜑 ∧ 𝑓 ∈ 𝐴) → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴)
38	37	expcom 413	. . . 4 ⊢ (𝑓 ∈ 𝐴 → (𝜑 → (𝑡 ∈ 𝑇 ↦ ((𝑓‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴))
39	25, 38	vtoclga 3520	. . 3 ⊢ ((𝑠 ∈ 𝑇 ↦ 𝐸) ∈ 𝐴 → (𝜑 → (𝑡 ∈ 𝑇 ↦ (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴))
40	20, 39	mpcom 38	. 2 ⊢ (𝜑 → (𝑡 ∈ 𝑇 ↦ (((𝑠 ∈ 𝑇 ↦ 𝐸)‘𝑡) · (𝐹‘𝑡))) ∈ 𝐴)
41	11, 40	eqeltrd 2836	1 ⊢ (𝜑 → (𝑡 ∈ 𝑇 ↦ (𝐸 · (𝐹‘𝑡))) ∈ 𝐴)

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1087   = wceq 1542  Ⅎwnf 1785   ∈ wcel 2114   ↦ cmpt 5166  ⟶wf 6494  ‘cfv 6498  (class class class)co 7367  ℝcr 11037   · cmul 11043

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-nul 5241  ax-pr 5375

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-iota 6454  df-fun 6500  df-fv 6506  df-ov 7370

This theorem is referenced by:  stoweidlem17  46445