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Mirrors > Home > MPE Home > Th. List > lssne0 | Structured version Visualization version GIF version |
Description: A nonzero subspace has a nonzero vector. (shne0i 29818 analog.) (Contributed by NM, 20-Apr-2014.) (Proof shortened by Mario Carneiro, 8-Jan-2015.) |
Ref | Expression |
---|---|
lss0cl.z | ⊢ 0 = (0g‘𝑊) |
lss0cl.s | ⊢ 𝑆 = (LSubSp‘𝑊) |
Ref | Expression |
---|---|
lssne0 | ⊢ (𝑋 ∈ 𝑆 → (𝑋 ≠ { 0 } ↔ ∃𝑦 ∈ 𝑋 𝑦 ≠ 0 )) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lss0cl.s | . . . . 5 ⊢ 𝑆 = (LSubSp‘𝑊) | |
2 | 1 | lssn0 20212 | . . . 4 ⊢ (𝑋 ∈ 𝑆 → 𝑋 ≠ ∅) |
3 | eqsn 4762 | . . . 4 ⊢ (𝑋 ≠ ∅ → (𝑋 = { 0 } ↔ ∀𝑦 ∈ 𝑋 𝑦 = 0 )) | |
4 | 2, 3 | syl 17 | . . 3 ⊢ (𝑋 ∈ 𝑆 → (𝑋 = { 0 } ↔ ∀𝑦 ∈ 𝑋 𝑦 = 0 )) |
5 | nne 2947 | . . . . 5 ⊢ (¬ 𝑦 ≠ 0 ↔ 𝑦 = 0 ) | |
6 | 5 | ralbii 3091 | . . . 4 ⊢ (∀𝑦 ∈ 𝑋 ¬ 𝑦 ≠ 0 ↔ ∀𝑦 ∈ 𝑋 𝑦 = 0 ) |
7 | ralnex 3165 | . . . 4 ⊢ (∀𝑦 ∈ 𝑋 ¬ 𝑦 ≠ 0 ↔ ¬ ∃𝑦 ∈ 𝑋 𝑦 ≠ 0 ) | |
8 | 6, 7 | bitr3i 276 | . . 3 ⊢ (∀𝑦 ∈ 𝑋 𝑦 = 0 ↔ ¬ ∃𝑦 ∈ 𝑋 𝑦 ≠ 0 ) |
9 | 4, 8 | bitr2di 288 | . 2 ⊢ (𝑋 ∈ 𝑆 → (¬ ∃𝑦 ∈ 𝑋 𝑦 ≠ 0 ↔ 𝑋 = { 0 })) |
10 | 9 | necon1abid 2982 | 1 ⊢ (𝑋 ∈ 𝑆 → (𝑋 ≠ { 0 } ↔ ∃𝑦 ∈ 𝑋 𝑦 ≠ 0 )) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 ∀wral 3064 ∃wrex 3065 ∅c0 4256 {csn 4561 ‘cfv 6426 0gc0g 17160 LSubSpclss 20203 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5221 ax-nul 5228 ax-pow 5286 ax-pr 5350 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-ral 3069 df-rex 3070 df-rab 3073 df-v 3431 df-dif 3889 df-un 3891 df-in 3893 df-ss 3903 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-br 5074 df-opab 5136 df-mpt 5157 df-id 5484 df-xp 5590 df-rel 5591 df-cnv 5592 df-co 5593 df-dm 5594 df-iota 6384 df-fun 6428 df-fv 6434 df-ov 7270 df-lss 20204 |
This theorem is referenced by: lsmsat 37030 lssatomic 37033 dochsatshpb 39474 hgmapvvlem3 39947 |
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