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Theorem stoweidlem2 43543
Description: lemma for stoweid 43604: 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 𝑡𝜑
stoweidlem2.2 ((𝜑𝑓𝐴𝑔𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴)
stoweidlem2.3 ((𝜑𝑥 ∈ ℝ) → (𝑡𝑇𝑥) ∈ 𝐴)
stoweidlem2.4 ((𝜑𝑓𝐴) → 𝑓:𝑇⟶ℝ)
stoweidlem2.5 (𝜑𝐸 ∈ ℝ)
stoweidlem2.6 (𝜑𝐹𝐴)
Assertion
Ref Expression
stoweidlem2 (𝜑 → (𝑡𝑇 ↦ (𝐸 · (𝐹𝑡))) ∈ 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.
StepHypRef Expression
1 stoweidlem2.1 . . 3 𝑡𝜑
2 simpr 485 . . . . . 6 ((𝜑𝑡𝑇) → 𝑡𝑇)
3 stoweidlem2.5 . . . . . . 7 (𝜑𝐸 ∈ ℝ)
43adantr 481 . . . . . 6 ((𝜑𝑡𝑇) → 𝐸 ∈ ℝ)
5 eqidd 2739 . . . . . . . 8 (𝑠 = 𝑡𝐸 = 𝐸)
65cbvmptv 5187 . . . . . . 7 (𝑠𝑇𝐸) = (𝑡𝑇𝐸)
76fvmpt2 6886 . . . . . 6 ((𝑡𝑇𝐸 ∈ ℝ) → ((𝑠𝑇𝐸)‘𝑡) = 𝐸)
82, 4, 7syl2anc 584 . . . . 5 ((𝜑𝑡𝑇) → ((𝑠𝑇𝐸)‘𝑡) = 𝐸)
98eqcomd 2744 . . . 4 ((𝜑𝑡𝑇) → 𝐸 = ((𝑠𝑇𝐸)‘𝑡))
109oveq1d 7290 . . 3 ((𝜑𝑡𝑇) → (𝐸 · (𝐹𝑡)) = (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡)))
111, 10mpteq2da 5172 . 2 (𝜑 → (𝑡𝑇 ↦ (𝐸 · (𝐹𝑡))) = (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))))
12 id 22 . . . . . . . . 9 (𝑥 = 𝐸𝑥 = 𝐸)
1312mpteq2dv 5176 . . . . . . . 8 (𝑥 = 𝐸 → (𝑡𝑇𝑥) = (𝑡𝑇𝐸))
1413eleq1d 2823 . . . . . . 7 (𝑥 = 𝐸 → ((𝑡𝑇𝑥) ∈ 𝐴 ↔ (𝑡𝑇𝐸) ∈ 𝐴))
1514imbi2d 341 . . . . . 6 (𝑥 = 𝐸 → ((𝜑 → (𝑡𝑇𝑥) ∈ 𝐴) ↔ (𝜑 → (𝑡𝑇𝐸) ∈ 𝐴)))
16 stoweidlem2.3 . . . . . . 7 ((𝜑𝑥 ∈ ℝ) → (𝑡𝑇𝑥) ∈ 𝐴)
1716expcom 414 . . . . . 6 (𝑥 ∈ ℝ → (𝜑 → (𝑡𝑇𝑥) ∈ 𝐴))
1815, 17vtoclga 3513 . . . . 5 (𝐸 ∈ ℝ → (𝜑 → (𝑡𝑇𝐸) ∈ 𝐴))
193, 18mpcom 38 . . . 4 (𝜑 → (𝑡𝑇𝐸) ∈ 𝐴)
206, 19eqeltrid 2843 . . 3 (𝜑 → (𝑠𝑇𝐸) ∈ 𝐴)
21 fveq1 6773 . . . . . . . 8 (𝑓 = (𝑠𝑇𝐸) → (𝑓𝑡) = ((𝑠𝑇𝐸)‘𝑡))
2221oveq1d 7290 . . . . . . 7 (𝑓 = (𝑠𝑇𝐸) → ((𝑓𝑡) · (𝐹𝑡)) = (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡)))
2322mpteq2dv 5176 . . . . . 6 (𝑓 = (𝑠𝑇𝐸) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) = (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))))
2423eleq1d 2823 . . . . 5 (𝑓 = (𝑠𝑇𝐸) → ((𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴 ↔ (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴))
2524imbi2d 341 . . . 4 (𝑓 = (𝑠𝑇𝐸) → ((𝜑 → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴) ↔ (𝜑 → (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴)))
26 stoweidlem2.6 . . . . . . 7 (𝜑𝐹𝐴)
2726adantr 481 . . . . . 6 ((𝜑𝑓𝐴) → 𝐹𝐴)
28 fveq1 6773 . . . . . . . . . . 11 (𝑔 = 𝐹 → (𝑔𝑡) = (𝐹𝑡))
2928oveq2d 7291 . . . . . . . . . 10 (𝑔 = 𝐹 → ((𝑓𝑡) · (𝑔𝑡)) = ((𝑓𝑡) · (𝐹𝑡)))
3029mpteq2dv 5176 . . . . . . . . 9 (𝑔 = 𝐹 → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) = (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))))
3130eleq1d 2823 . . . . . . . 8 (𝑔 = 𝐹 → ((𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴 ↔ (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴))
3231imbi2d 341 . . . . . . 7 (𝑔 = 𝐹 → (((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴) ↔ ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴)))
33 stoweidlem2.2 . . . . . . . . 9 ((𝜑𝑓𝐴𝑔𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴)
34333comr 1124 . . . . . . . 8 ((𝑔𝐴𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴)
35343expib 1121 . . . . . . 7 (𝑔𝐴 → ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴))
3632, 35vtoclga 3513 . . . . . 6 (𝐹𝐴 → ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴))
3727, 36mpcom 38 . . . . 5 ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴)
3837expcom 414 . . . 4 (𝑓𝐴 → (𝜑 → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴))
3925, 38vtoclga 3513 . . 3 ((𝑠𝑇𝐸) ∈ 𝐴 → (𝜑 → (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴))
4020, 39mpcom 38 . 2 (𝜑 → (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴)
4111, 40eqeltrd 2839 1 (𝜑 → (𝑡𝑇 ↦ (𝐸 · (𝐹𝑡))) ∈ 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  w3a 1086   = wceq 1539  wnf 1786  wcel 2106  cmpt 5157  wf 6429  cfv 6433  (class class class)co 7275  cr 10870   · cmul 10876
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pr 5352
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-br 5075  df-opab 5137  df-mpt 5158  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-iota 6391  df-fun 6435  df-fv 6441  df-ov 7278
This theorem is referenced by:  stoweidlem17  43558
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