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Theorem lcomf 21182
Description: A linear-combination sum is a function. (Contributed by Stefan O'Rear, 28-Feb-2015.)
Hypotheses
Ref Expression
lcomf.f 𝐹 = (Scalar‘𝑊)
lcomf.k 𝐾 = (Base‘𝐹)
lcomf.s · = ( ·𝑠 ‘𝑊)
lcomf.b 𝐵 = (Base‘𝑊)
lcomf.w (𝜑 → 𝑊 ∈ LMod)
lcomf.g (𝜑 → 𝐺:𝐼⟶𝐾)
lcomf.h (𝜑 → 𝐻:𝐼⟶𝐵)
lcomf.i (𝜑 → 𝐼 ∈ 𝑉)
Assertion
Ref Expression
lcomf (𝜑 → (𝐺 ∘f · 𝐻):𝐼⟶𝐵)

Proof of Theorem lcomf
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 lcomf.w . . 3 (𝜑 → 𝑊 ∈ LMod)
2 lcomf.b . . . . 5 𝐵 = (Base‘𝑊)
3 lcomf.f . . . . 5 𝐹 = (Scalar‘𝑊)
4 lcomf.s . . . . 5 · = ( ·𝑠 ‘𝑊)
5 lcomf.k . . . . 5 𝐾 = (Base‘𝐹)
62, 3, 4, 5lmodvscl 21159 . . . 4 ((𝑊 ∈ LMod ∧ 𝑥 ∈ 𝐾 ∧ 𝑦 ∈ 𝐵) → (𝑥 · 𝑦) ∈ 𝐵)
763expb 1138 . . 3 ((𝑊 ∈ LMod ∧ (𝑥 ∈ 𝐾 ∧ 𝑦 ∈ 𝐵)) → (𝑥 · 𝑦) ∈ 𝐵)
81, 7sylan 592 . 2 ((𝜑 ∧ (𝑥 ∈ 𝐾 ∧ 𝑦 ∈ 𝐵)) → (𝑥 · 𝑦) ∈ 𝐵)
9 lcomf.g . 2 (𝜑 → 𝐺:𝐼⟶𝐾)
10 lcomf.h . 2 (𝜑 → 𝐻:𝐼⟶𝐵)
11 lcomf.i . 2 (𝜑 → 𝐼 ∈ 𝑉)
12 inidm 4123 . 2 (𝐼 ∩ 𝐼) = 𝐼
138, 9, 10, 11, 11, 12off 7712 1 (𝜑 → (𝐺 ∘f · 𝐻):𝐼⟶𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1569   ∈ wcel 2144  ⟶wf 6535  ‘cfv 6539  (class class class)co 7421   ∘f cof 7692  Basecbs 17393  Scalarcsca 17437   ·𝑠 cvsca 17438  LModclmod 21141
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546  df-fv 6547  df-ov 7424  df-oprab 7425  df-mpo 7426  df-of 7694  df-lmod 21143
This theorem is used by:  lcomfsupp  21183  frlmup2  22111  islindf4  22150  fedgmullem2  34309
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