Theorem lssex 14489

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.

Step	Hyp	Ref	Expression
1		basfn 13260	. . . . . 6 ⊢ Base Fn V
2		vex 2815	. . . . . . 7 ⊢ 𝑤 ∈ V
3	2	a1i 9	. . . . . 6 ⊢ (𝑊 ∈ 𝑉 → 𝑤 ∈ V)
4		funfvex 5686	. . . . . . 7 ⊢ ((Fun Base ∧ 𝑤 ∈ dom Base) → (Base‘𝑤) ∈ V)
5	4	funfni 5457	. . . . . 6 ⊢ ((Base Fn V ∧ 𝑤 ∈ V) → (Base‘𝑤) ∈ V)
6	1, 3, 5	sylancr 414	. . . . 5 ⊢ (𝑊 ∈ 𝑉 → (Base‘𝑤) ∈ V)
7	6	pwexd 4293	. . . 4 ⊢ (𝑊 ∈ 𝑉 → 𝒫 (Base‘𝑤) ∈ V)
8		rabexg 4254	. . . 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)
9	7, 8	syl 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)
10	9	alrimiv 1923	. 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 14488	. . 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)})
12	11	mptfvex 5762	. 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)
13	10, 12	mpancom 422	1 ⊢ (𝑊 ∈ 𝑉 → (LSubSp‘𝑊) ∈ V)

Syntax hints:   → wi 4   ∧ wa 104  ∀wal 1396  ∃wex 1541   ∈ wcel 2203  ∀wral 2520  {crab 2524  Vcvv 2812  𝒫 cpw 3668   Fn wfn 5346  ‘cfv 5351  (class class class)co 6049  Basecbs 13201  +_gcplusg 13279  Scalarcsca 13282   ·_𝑠 cvsca 13283  LSubSpclss 14487

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4227  ax-pow 4286  ax-pr 4321  ax-un 4553  ax-cnex 8214  ax-resscn 8215  ax-1re 8217  ax-addrcl 8220

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-rab 2529  df-v 2814  df-sbc 3042  df-csb 3138  df-un 3214  df-in 3216  df-ss 3223  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-int 3949  df-br 4109  df-opab 4171  df-mpt 4172  df-id 4413  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-rn 4759  df-res 4760  df-iota 5311  df-fun 5353  df-fn 5354  df-fv 5359  df-inn 9234  df-ndx 13204  df-slot 13205  df-base 13207  df-lssm 14488

This theorem is referenced by:  lidlex  14608