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Theorem stoweidlem2 40537
Description: lemma for stoweid 40598: 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 476 . . . . . 6 ((𝜑𝑡𝑇) → 𝑡𝑇)
3 stoweidlem2.5 . . . . . . 7 (𝜑𝐸 ∈ ℝ)
43adantr 480 . . . . . 6 ((𝜑𝑡𝑇) → 𝐸 ∈ ℝ)
5 eqidd 2652 . . . . . . . 8 (𝑠 = 𝑡𝐸 = 𝐸)
65cbvmptv 4783 . . . . . . 7 (𝑠𝑇𝐸) = (𝑡𝑇𝐸)
76fvmpt2 6330 . . . . . 6 ((𝑡𝑇𝐸 ∈ ℝ) → ((𝑠𝑇𝐸)‘𝑡) = 𝐸)
82, 4, 7syl2anc 694 . . . . 5 ((𝜑𝑡𝑇) → ((𝑠𝑇𝐸)‘𝑡) = 𝐸)
98eqcomd 2657 . . . 4 ((𝜑𝑡𝑇) → 𝐸 = ((𝑠𝑇𝐸)‘𝑡))
109oveq1d 6705 . . 3 ((𝜑𝑡𝑇) → (𝐸 · (𝐹𝑡)) = (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡)))
111, 10mpteq2da 4776 . 2 (𝜑 → (𝑡𝑇 ↦ (𝐸 · (𝐹𝑡))) = (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))))
12 id 22 . . . . . . . . 9 (𝑥 = 𝐸𝑥 = 𝐸)
1312mpteq2dv 4778 . . . . . . . 8 (𝑥 = 𝐸 → (𝑡𝑇𝑥) = (𝑡𝑇𝐸))
1413eleq1d 2715 . . . . . . 7 (𝑥 = 𝐸 → ((𝑡𝑇𝑥) ∈ 𝐴 ↔ (𝑡𝑇𝐸) ∈ 𝐴))
1514imbi2d 329 . . . . . 6 (𝑥 = 𝐸 → ((𝜑 → (𝑡𝑇𝑥) ∈ 𝐴) ↔ (𝜑 → (𝑡𝑇𝐸) ∈ 𝐴)))
16 stoweidlem2.3 . . . . . . 7 ((𝜑𝑥 ∈ ℝ) → (𝑡𝑇𝑥) ∈ 𝐴)
1716expcom 450 . . . . . 6 (𝑥 ∈ ℝ → (𝜑 → (𝑡𝑇𝑥) ∈ 𝐴))
1815, 17vtoclga 3303 . . . . 5 (𝐸 ∈ ℝ → (𝜑 → (𝑡𝑇𝐸) ∈ 𝐴))
193, 18mpcom 38 . . . 4 (𝜑 → (𝑡𝑇𝐸) ∈ 𝐴)
206, 19syl5eqel 2734 . . 3 (𝜑 → (𝑠𝑇𝐸) ∈ 𝐴)
21 fveq1 6228 . . . . . . . 8 (𝑓 = (𝑠𝑇𝐸) → (𝑓𝑡) = ((𝑠𝑇𝐸)‘𝑡))
2221oveq1d 6705 . . . . . . 7 (𝑓 = (𝑠𝑇𝐸) → ((𝑓𝑡) · (𝐹𝑡)) = (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡)))
2322mpteq2dv 4778 . . . . . 6 (𝑓 = (𝑠𝑇𝐸) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) = (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))))
2423eleq1d 2715 . . . . 5 (𝑓 = (𝑠𝑇𝐸) → ((𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴 ↔ (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴))
2524imbi2d 329 . . . 4 (𝑓 = (𝑠𝑇𝐸) → ((𝜑 → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴) ↔ (𝜑 → (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴)))
26 stoweidlem2.6 . . . . . . 7 (𝜑𝐹𝐴)
2726adantr 480 . . . . . 6 ((𝜑𝑓𝐴) → 𝐹𝐴)
28 fveq1 6228 . . . . . . . . . . 11 (𝑔 = 𝐹 → (𝑔𝑡) = (𝐹𝑡))
2928oveq2d 6706 . . . . . . . . . 10 (𝑔 = 𝐹 → ((𝑓𝑡) · (𝑔𝑡)) = ((𝑓𝑡) · (𝐹𝑡)))
3029mpteq2dv 4778 . . . . . . . . 9 (𝑔 = 𝐹 → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) = (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))))
3130eleq1d 2715 . . . . . . . 8 (𝑔 = 𝐹 → ((𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴 ↔ (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴))
3231imbi2d 329 . . . . . . 7 (𝑔 = 𝐹 → (((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴) ↔ ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴)))
33 stoweidlem2.2 . . . . . . . . 9 ((𝜑𝑓𝐴𝑔𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴)
34333comr 1290 . . . . . . . 8 ((𝑔𝐴𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴)
35343expib 1287 . . . . . . 7 (𝑔𝐴 → ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝑔𝑡))) ∈ 𝐴))
3632, 35vtoclga 3303 . . . . . 6 (𝐹𝐴 → ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴))
3727, 36mpcom 38 . . . . 5 ((𝜑𝑓𝐴) → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴)
3837expcom 450 . . . 4 (𝑓𝐴 → (𝜑 → (𝑡𝑇 ↦ ((𝑓𝑡) · (𝐹𝑡))) ∈ 𝐴))
3925, 38vtoclga 3303 . . 3 ((𝑠𝑇𝐸) ∈ 𝐴 → (𝜑 → (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴))
4020, 39mpcom 38 . 2 (𝜑 → (𝑡𝑇 ↦ (((𝑠𝑇𝐸)‘𝑡) · (𝐹𝑡))) ∈ 𝐴)
4111, 40eqeltrd 2730 1 (𝜑 → (𝑡𝑇 ↦ (𝐸 · (𝐹𝑡))) ∈ 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383  w3a 1054   = wceq 1523  wnf 1748  wcel 2030  cmpt 4762  wf 5922  cfv 5926  (class class class)co 6690  cr 9973   · cmul 9979
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fv 5934  df-ov 6693
This theorem is referenced by:  stoweidlem17  40552
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