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Theorem lssex 14801
Description: Existence of a linear subspace. (Contributed by Jim Kingdon, 27-Apr-2025.)
Assertion
Ref Expression
lssex (𝑊 ∈ 𝑉 → (LSubSp‘𝑊) ∈ V)

Proof of Theorem lssex
Dummy variables 𝑤 𝑎 𝑏 𝑗 𝑠 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 basfn 13470 . . . . . 6 Base Fn V
2 vex 2824 . . . . . . 7 𝑤 ∈ V
32a1i 9 . . . . . 6 (𝑊 ∈ 𝑉 → 𝑤 ∈ V)
4 funfvex 5715 . . . . . . 7 ((Fun Base ∧ 𝑤 ∈ dom Base) → (Base‘𝑤) ∈ V)
54funfni 5486 . . . . . 6 ((Base Fn V ∧ 𝑤 ∈ V) → (Base‘𝑤) ∈ V)
61, 3, 5sylancr 418 . . . . 5 (𝑊 ∈ 𝑉 → (Base‘𝑤) ∈ V)
76pwexd 4320 . . . 4 (𝑊 ∈ 𝑉 → 𝒫 (Base‘𝑤) ∈ V)
8 rabexg 4281 . . . 4 (𝒫 (Base‘𝑤) ∈ V → {𝑠 ∈ 𝒫 (Base‘𝑤) ∣ (∃𝑗 𝑗 ∈ 𝑠 ∧ ∀𝑥 ∈ (Base‘(Scalar‘𝑤))∀𝑎 ∈ 𝑠 ∀𝑏 ∈ 𝑠 ((𝑥( ·𝑠 ‘𝑤)𝑎)(+g‘𝑤)𝑏) ∈ 𝑠)} ∈ V)
97, 8syl 14 . . 3 (𝑊 ∈ 𝑉 → {𝑠 ∈ 𝒫 (Base‘𝑤) ∣ (∃𝑗 𝑗 ∈ 𝑠 ∧ ∀𝑥 ∈ (Base‘(Scalar‘𝑤))∀𝑎 ∈ 𝑠 ∀𝑏 ∈ 𝑠 ((𝑥( ·𝑠 ‘𝑤)𝑎)(+g‘𝑤)𝑏) ∈ 𝑠)} ∈ V)
109alrimiv 1927 . 2 (𝑊 ∈ 𝑉 → ∀𝑤{𝑠 ∈ 𝒫 (Base‘𝑤) ∣ (∃𝑗 𝑗 ∈ 𝑠 ∧ ∀𝑥 ∈ (Base‘(Scalar‘𝑤))∀𝑎 ∈ 𝑠 ∀𝑏 ∈ 𝑠 ((𝑥( ·𝑠 ‘𝑤)𝑎)(+g‘𝑤)𝑏) ∈ 𝑠)} ∈ V)
11 df-lssm 14800 . . 3 LSubSp = (𝑤 ∈ V ↦ {𝑠 ∈ 𝒫 (Base‘𝑤) ∣ (∃𝑗 𝑗 ∈ 𝑠 ∧ ∀𝑥 ∈ (Base‘(Scalar‘𝑤))∀𝑎 ∈ 𝑠 ∀𝑏 ∈ 𝑠 ((𝑥( ·𝑠 ‘𝑤)𝑎)(+g‘𝑤)𝑏) ∈ 𝑠)})
1211mptfvex 5794 . 2 ((∀𝑤{𝑠 ∈ 𝒫 (Base‘𝑤) ∣ (∃𝑗 𝑗 ∈ 𝑠 ∧ ∀𝑥 ∈ (Base‘(Scalar‘𝑤))∀𝑎 ∈ 𝑠 ∀𝑏 ∈ 𝑠 ((𝑥( ·𝑠 ‘𝑤)𝑎)(+g‘𝑤)𝑏) ∈ 𝑠)} ∈ V ∧ 𝑊 ∈ 𝑉) → (LSubSp‘𝑊) ∈ V)
1310, 12mpancom 426 1 (𝑊 ∈ 𝑉 → (LSubSp‘𝑊) ∈ V)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ∧ wa 104  ∀wal 1400  ∃wex 1545   ∈ wcel 2209  ∀wral 2528  {crab 2532  Vcvv 2821  𝒫 cpw 3688   Fn wfn 5375  ‘cfv 5380  (class class class)co 6088  Basecbs 13411  +gcplusg 13491  Scalarcsca 13494   ·𝑠 cvsca 13495  LSubSpclss 14799
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-cnex 8277  ax-resscn 8278  ax-1re 8280  ax-addrcl 8283
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4132  df-opab 4194  df-mpt 4195  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-iota 5340  df-fun 5382  df-fn 5383  df-fv 5388  df-inn 9315  df-ndx 13414  df-slot 13415  df-base 13417  df-lssm 14800
This theorem is used by:  lidlex  14920
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