Theorem drngunit 20734

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 = (0g‘𝑅)

Assertion

Ref	Expression
drngunit	⊢ (𝑅 ∈ DivRing → (𝑋 ∈ 𝑈 ↔ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 )))

Proof of Theorem drngunit

Step	Hyp	Ref	Expression
1		isdrng.b	. . . . 5 ⊢ 𝐵 = (Base‘𝑅)
2		isdrng.u	. . . . 5 ⊢ 𝑈 = (Unit‘𝑅)
3		isdrng.z	. . . . 5 ⊢ 0 = (0g‘𝑅)
4	1, 2, 3	isdrng 20733	. . . 4 ⊢ (𝑅 ∈ DivRing ↔ (𝑅 ∈ Ring ∧ 𝑈 = (𝐵 ∖ { 0 })))
5	4	simprbi 496	. . 3 ⊢ (𝑅 ∈ DivRing → 𝑈 = (𝐵 ∖ { 0 }))
6	5	eleq2d 2827	. 2 ⊢ (𝑅 ∈ DivRing → (𝑋 ∈ 𝑈 ↔ 𝑋 ∈ (𝐵 ∖ { 0 })))
7		eldifsn 4786	. 2 ⊢ (𝑋 ∈ (𝐵 ∖ { 0 }) ↔ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 ))
8	6, 7	bitrdi 287	1 ⊢ (𝑅 ∈ DivRing → (𝑋 ∈ 𝑈 ↔ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 )))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1540   ∈ wcel 2108   ≠ wne 2940   ∖ cdif 3948  {csn 4626  ‘cfv 6561  Basecbs 17247  0_gc0g 17484  Ringcrg 20230  Unitcui 20355  DivRingcdr 20729

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2708

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-ne 2941  df-rab 3437  df-v 3482  df-dif 3954  df-un 3956  df-ss 3968  df-nul 4334  df-if 4526  df-sn 4627  df-pr 4629  df-op 4633  df-uni 4908  df-br 5144  df-iota 6514  df-fv 6569  df-drng 20731

This theorem is referenced by:  drngunz  20747  drnginvrcl  20753  drnginvrn0  20754  drnginvrl  20756  drnginvrr  20757  issubdrg  20781  sdrgunit  20797  abvdiv  20830  qsssubdrg  21444  redvr  21635  drnguc1p  26213  lgseisenlem3  27421  sdrgdvcl  33301  sdrginvcl  33302  ornglmullt  33337  orngrmullt  33338  isarchiofld  33347  1arithufd  33576  ply1asclunit  33599  ply1dg1rt  33604  qqhval2lem  33982  qqhf  33987  matunitlindf  37625  fldhmf1  42091  lincreslvec3  48399  isldepslvec2  48402