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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 30432 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 20416 | . . . 4 ⊢ (𝑋 ∈ 𝑆 → 𝑋 ≠ ∅) |
3 | eqsn 4790 | . . . 4 ⊢ (𝑋 ≠ ∅ → (𝑋 = { 0 } ↔ ∀𝑦 ∈ 𝑋 𝑦 = 0 )) | |
4 | 2, 3 | syl 17 | . . 3 ⊢ (𝑋 ∈ 𝑆 → (𝑋 = { 0 } ↔ ∀𝑦 ∈ 𝑋 𝑦 = 0 )) |
5 | nne 2944 | . . . . 5 ⊢ (¬ 𝑦 ≠ 0 ↔ 𝑦 = 0 ) | |
6 | 5 | ralbii 3093 | . . . 4 ⊢ (∀𝑦 ∈ 𝑋 ¬ 𝑦 ≠ 0 ↔ ∀𝑦 ∈ 𝑋 𝑦 = 0 ) |
7 | ralnex 3072 | . . . 4 ⊢ (∀𝑦 ∈ 𝑋 ¬ 𝑦 ≠ 0 ↔ ¬ ∃𝑦 ∈ 𝑋 𝑦 ≠ 0 ) | |
8 | 6, 7 | bitr3i 277 | . . 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 2979 | 1 ⊢ (𝑋 ∈ 𝑆 → (𝑋 ≠ { 0 } ↔ ∃𝑦 ∈ 𝑋 𝑦 ≠ 0 )) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 = wceq 1542 ∈ wcel 2107 ≠ wne 2940 ∀wral 3061 ∃wrex 3070 ∅c0 4283 {csn 4587 ‘cfv 6497 0gc0g 17326 LSubSpclss 20407 |
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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5257 ax-nul 5264 ax-pow 5321 ax-pr 5385 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2941 df-ral 3062 df-rex 3071 df-rab 3407 df-v 3446 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-nul 4284 df-if 4488 df-pw 4563 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4867 df-br 5107 df-opab 5169 df-mpt 5190 df-id 5532 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-iota 6449 df-fun 6499 df-fv 6505 df-ov 7361 df-lss 20408 |
This theorem is referenced by: lsmsat 37516 lssatomic 37519 dochsatshpb 39961 hgmapvvlem3 40434 |
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