Theorem lssn0 19711

Description: A subspace is not empty. (Contributed by NM, 12-Jan-2014.) (Revised by Mario Carneiro, 8-Jan-2015.)

Hypothesis

Ref	Expression
lssn0.s	⊢ 𝑆 = (LSubSp‘𝑊)

Assertion

Ref	Expression
lssn0	⊢ (𝑈 ∈ 𝑆 → 𝑈 ≠ ∅)

Proof of Theorem lssn0

Dummy variables 𝑎 𝑏 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2821	. . 3 ⊢ (Scalar‘𝑊) = (Scalar‘𝑊)
2		eqid 2821	. . 3 ⊢ (Base‘(Scalar‘𝑊)) = (Base‘(Scalar‘𝑊))
3		eqid 2821	. . 3 ⊢ (Base‘𝑊) = (Base‘𝑊)
4		eqid 2821	. . 3 ⊢ (+g‘𝑊) = (+g‘𝑊)
5		eqid 2821	. . 3 ⊢ ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑊)
6		lssn0.s	. . 3 ⊢ 𝑆 = (LSubSp‘𝑊)
7	1, 2, 3, 4, 5, 6	islss 19705	. 2 ⊢ (𝑈 ∈ 𝑆 ↔ (𝑈 ⊆ (Base‘𝑊) ∧ 𝑈 ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(Scalar‘𝑊))∀𝑎 ∈ 𝑈 ∀𝑏 ∈ 𝑈 ((𝑥( ·𝑠 ‘𝑊)𝑎)(+g‘𝑊)𝑏) ∈ 𝑈))
8	7	simp2bi 1142	1 ⊢ (𝑈 ∈ 𝑆 → 𝑈 ≠ ∅)

Syntax hints:   → wi 4   = wceq 1533   ∈ wcel 2110   ≠ wne 3016  ∀wral 3138   ⊆ wss 3935  ∅c0 4290  ‘cfv 6354  (class class class)co 7155  Basecbs 16482  +_gcplusg 16564  Scalarcsca 16567   ·_𝑠 cvsca 16568  LSubSpclss 19702

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5202  ax-nul 5209  ax-pow 5265  ax-pr 5329

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3772  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4567  df-pr 4569  df-op 4573  df-uni 4838  df-br 5066  df-opab 5128  df-mpt 5146  df-id 5459  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-iota 6313  df-fun 6356  df-fv 6362  df-ov 7158  df-lss 19703

This theorem is referenced by:  00lss  19712  lss0cl  19717  lssne0  19721  lsssubg  19728  lbsextlem2  19930  minveclem1  24026