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Theorem shne0i 31480
Description: A nonzero subspace has a nonzero vector. (Contributed by NM, 25-Feb-2006.) (New usage is discouraged.)
Hypothesis
Ref Expression
shne0.1 𝐴S
Assertion
Ref Expression
shne0i (𝐴 ≠ 0 ↔ ∃𝑥𝐴 𝑥 ≠ 0)
Distinct variable group:   𝑥,𝐴

Proof of Theorem shne0i
StepHypRef Expression
1 df-ne 2947 . 2 (𝐴 ≠ 0 ↔ ¬ 𝐴 = 0)
2 df-rex 3077 . . 3 (∃𝑥𝐴 ¬ 𝑥 ∈ 0 ↔ ∃𝑥(𝑥𝐴 ∧ ¬ 𝑥 ∈ 0))
3 nss 4073 . . 3 𝐴 ⊆ 0 ↔ ∃𝑥(𝑥𝐴 ∧ ¬ 𝑥 ∈ 0))
4 shne0.1 . . . . 5 𝐴S
5 shle0 31474 . . . . 5 (𝐴S → (𝐴 ⊆ 0𝐴 = 0))
64, 5ax-mp 5 . . . 4 (𝐴 ⊆ 0𝐴 = 0)
76notbii 320 . . 3 𝐴 ⊆ 0 ↔ ¬ 𝐴 = 0)
82, 3, 73bitr2ri 300 . 2 𝐴 = 0 ↔ ∃𝑥𝐴 ¬ 𝑥 ∈ 0)
9 elch0 31286 . . . 4 (𝑥 ∈ 0𝑥 = 0)
109necon3bbii 2994 . . 3 𝑥 ∈ 0𝑥 ≠ 0)
1110rexbii 3100 . 2 (∃𝑥𝐴 ¬ 𝑥 ∈ 0 ↔ ∃𝑥𝐴 𝑥 ≠ 0)
121, 8, 113bitri 297 1 (𝐴 ≠ 0 ↔ ∃𝑥𝐴 𝑥 ≠ 0)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 206  wa 395   = wceq 1537  wex 1777  wcel 2108  wne 2946  wrex 3076  wss 3976  0c0v 30956   S csh 30960  0c0h 30967
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2711  ax-sep 5317  ax-hilex 31031  ax-hv0cl 31035
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-sb 2065  df-clab 2718  df-cleq 2732  df-clel 2819  df-ne 2947  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-br 5167  df-opab 5229  df-xp 5706  df-cnv 5708  df-dm 5710  df-rn 5711  df-res 5712  df-ima 5713  df-sh 31239  df-ch0 31285
This theorem is referenced by:  chne0i  31485  shatomici  32390
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