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Theorem drngunit 20901
Description: Elementhood in the set of units when 𝑅 is a division ring. (Contributed by Mario Carneiro, 2-Dec-2014.)
Hypotheses
Ref Expression
isdrng.b 𝐵 = (Base‘𝑅)
isdrng.u 𝑈 = (Unit‘𝑅)
isdrng.z 0 = (0g𝑅)
Assertion
Ref Expression
drngunit (𝑅 ∈ DivRing → (𝑋𝑈 ↔ (𝑋𝐵𝑋0 )))

Proof of Theorem drngunit
StepHypRef Expression
1 isdrng.b . . . . 5 𝐵 = (Base‘𝑅)
2 isdrng.u . . . . 5 𝑈 = (Unit‘𝑅)
3 isdrng.z . . . . 5 0 = (0g𝑅)
41, 2, 3isdrng 20900 . . . 4 (𝑅 ∈ DivRing ↔ (𝑅 ∈ Ring ∧ 𝑈 = (𝐵 ∖ { 0 })))
54simprbi 503 . . 3 (𝑅 ∈ DivRing → 𝑈 = (𝐵 ∖ { 0 }))
65eleq2d 2848 . 2 (𝑅 ∈ DivRing → (𝑋𝑈𝑋 ∈ (𝐵 ∖ { 0 })))
7 eldifsn 4751 . 2 (𝑋 ∈ (𝐵 ∖ { 0 }) ↔ (𝑋𝐵𝑋0 ))
86, 7bitrdi 290 1 (𝑅 ∈ DivRing → (𝑋𝑈 ↔ (𝑋𝐵𝑋0 )))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wb 209  wa 401   = wceq 1570  wcel 2145  wne 2957  cdif 3899  {csn 4587  cfv 6537  Basecbs 17307  0gc0g 17530  Ringcrg 20378  Unitcui 20502  DivRingcdr 20896
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2734
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2741  df-cleq 2754  df-clel 2837  df-ne 2958  df-rab 3415  df-v 3455  df-dif 3905  df-un 3907  df-ss 3919  df-nul 4283  df-if 4486  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4871  df-br 5108  df-iota 6493  df-fv 6545  df-drng 20898
This theorem is used by:  drngunz  20916  drnginvrcl  20926  drnginvrn0  20927  drnginvrl  20929  drnginvrr  20930  issubdrg  20952  sdrgunit  20968  abvdiv  21001  ornglmullt  21041  orngrmullt  21042  qsssubdrg  21645  redvr  21836  matunitlindf  22909  drnguc1p  26406  lgseisenlem3  27621  fxpsdrg  33623  isarchiofld  33647  sdrgdvcl  33748  sdrginvcl  33749  drnglring  33910  1arithufd  33966  ply1asclunit  33992  ply1dg1rt  33998  qqhval2lem  34499  qqhf  34504  fldhmf1  42964  lincreslvec3  49420  isldepslvec2  49423  veroquaddetzerod  50827
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