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Theorem isdomn 20764
Description: Expand definition of a domain. (Contributed by Mario Carneiro, 28-Mar-2015.)
Hypotheses
Ref Expression
isdomn.b 𝐵 = (Base‘𝑅)
isdomn.t · = (.r𝑅)
isdomn.z 0 = (0g𝑅)
Assertion
Ref Expression
isdomn (𝑅 ∈ Domn ↔ (𝑅 ∈ NzRing ∧ ∀𝑥𝐵𝑦𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0𝑦 = 0 ))))
Distinct variable groups:   𝑥,𝐵,𝑦   𝑥,𝑅,𝑦   𝑥, 0 ,𝑦
Allowed substitution hints:   · (𝑥,𝑦)

Proof of Theorem isdomn
Dummy variables 𝑏 𝑟 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fvexd 6857 . . 3 (𝑟 = 𝑅 → (Base‘𝑟) ∈ V)
2 fveq2 6842 . . . 4 (𝑟 = 𝑅 → (Base‘𝑟) = (Base‘𝑅))
3 isdomn.b . . . 4 𝐵 = (Base‘𝑅)
42, 3eqtr4di 2794 . . 3 (𝑟 = 𝑅 → (Base‘𝑟) = 𝐵)
5 fvexd 6857 . . . 4 ((𝑟 = 𝑅𝑏 = 𝐵) → (0g𝑟) ∈ V)
6 fveq2 6842 . . . . . 6 (𝑟 = 𝑅 → (0g𝑟) = (0g𝑅))
76adantr 481 . . . . 5 ((𝑟 = 𝑅𝑏 = 𝐵) → (0g𝑟) = (0g𝑅))
8 isdomn.z . . . . 5 0 = (0g𝑅)
97, 8eqtr4di 2794 . . . 4 ((𝑟 = 𝑅𝑏 = 𝐵) → (0g𝑟) = 0 )
10 simplr 767 . . . . 5 (((𝑟 = 𝑅𝑏 = 𝐵) ∧ 𝑧 = 0 ) → 𝑏 = 𝐵)
11 fveq2 6842 . . . . . . . . . 10 (𝑟 = 𝑅 → (.r𝑟) = (.r𝑅))
12 isdomn.t . . . . . . . . . 10 · = (.r𝑅)
1311, 12eqtr4di 2794 . . . . . . . . 9 (𝑟 = 𝑅 → (.r𝑟) = · )
1413oveqdr 7385 . . . . . . . 8 ((𝑟 = 𝑅𝑏 = 𝐵) → (𝑥(.r𝑟)𝑦) = (𝑥 · 𝑦))
15 id 22 . . . . . . . 8 (𝑧 = 0𝑧 = 0 )
1614, 15eqeqan12d 2750 . . . . . . 7 (((𝑟 = 𝑅𝑏 = 𝐵) ∧ 𝑧 = 0 ) → ((𝑥(.r𝑟)𝑦) = 𝑧 ↔ (𝑥 · 𝑦) = 0 ))
17 eqeq2 2748 . . . . . . . . 9 (𝑧 = 0 → (𝑥 = 𝑧𝑥 = 0 ))
18 eqeq2 2748 . . . . . . . . 9 (𝑧 = 0 → (𝑦 = 𝑧𝑦 = 0 ))
1917, 18orbi12d 917 . . . . . . . 8 (𝑧 = 0 → ((𝑥 = 𝑧𝑦 = 𝑧) ↔ (𝑥 = 0𝑦 = 0 )))
2019adantl 482 . . . . . . 7 (((𝑟 = 𝑅𝑏 = 𝐵) ∧ 𝑧 = 0 ) → ((𝑥 = 𝑧𝑦 = 𝑧) ↔ (𝑥 = 0𝑦 = 0 )))
2116, 20imbi12d 344 . . . . . 6 (((𝑟 = 𝑅𝑏 = 𝐵) ∧ 𝑧 = 0 ) → (((𝑥(.r𝑟)𝑦) = 𝑧 → (𝑥 = 𝑧𝑦 = 𝑧)) ↔ ((𝑥 · 𝑦) = 0 → (𝑥 = 0𝑦 = 0 ))))
2210, 21raleqbidv 3319 . . . . 5 (((𝑟 = 𝑅𝑏 = 𝐵) ∧ 𝑧 = 0 ) → (∀𝑦𝑏 ((𝑥(.r𝑟)𝑦) = 𝑧 → (𝑥 = 𝑧𝑦 = 𝑧)) ↔ ∀𝑦𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0𝑦 = 0 ))))
2310, 22raleqbidv 3319 . . . 4 (((𝑟 = 𝑅𝑏 = 𝐵) ∧ 𝑧 = 0 ) → (∀𝑥𝑏𝑦𝑏 ((𝑥(.r𝑟)𝑦) = 𝑧 → (𝑥 = 𝑧𝑦 = 𝑧)) ↔ ∀𝑥𝐵𝑦𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0𝑦 = 0 ))))
245, 9, 23sbcied2 3786 . . 3 ((𝑟 = 𝑅𝑏 = 𝐵) → ([(0g𝑟) / 𝑧]𝑥𝑏𝑦𝑏 ((𝑥(.r𝑟)𝑦) = 𝑧 → (𝑥 = 𝑧𝑦 = 𝑧)) ↔ ∀𝑥𝐵𝑦𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0𝑦 = 0 ))))
251, 4, 24sbcied2 3786 . 2 (𝑟 = 𝑅 → ([(Base‘𝑟) / 𝑏][(0g𝑟) / 𝑧]𝑥𝑏𝑦𝑏 ((𝑥(.r𝑟)𝑦) = 𝑧 → (𝑥 = 𝑧𝑦 = 𝑧)) ↔ ∀𝑥𝐵𝑦𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0𝑦 = 0 ))))
26 df-domn 20754 . 2 Domn = {𝑟 ∈ NzRing ∣ [(Base‘𝑟) / 𝑏][(0g𝑟) / 𝑧]𝑥𝑏𝑦𝑏 ((𝑥(.r𝑟)𝑦) = 𝑧 → (𝑥 = 𝑧𝑦 = 𝑧))}
2725, 26elrab2 3648 1 (𝑅 ∈ Domn ↔ (𝑅 ∈ NzRing ∧ ∀𝑥𝐵𝑦𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0𝑦 = 0 ))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 396  wo 845   = wceq 1541  wcel 2106  wral 3064  Vcvv 3445  [wsbc 3739  cfv 6496  (class class class)co 7357  Basecbs 17083  .rcmulr 17134  0gc0g 17321  NzRingcnzr 20727  Domncdomn 20750
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2707  ax-nul 5263
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-sb 2068  df-clab 2714  df-cleq 2728  df-clel 2814  df-ne 2944  df-ral 3065  df-rab 3408  df-v 3447  df-sbc 3740  df-dif 3913  df-un 3915  df-in 3917  df-ss 3927  df-nul 4283  df-if 4487  df-sn 4587  df-pr 4589  df-op 4593  df-uni 4866  df-br 5106  df-iota 6448  df-fv 6504  df-ov 7360  df-domn 20754
This theorem is referenced by:  domnnzr  20765  domneq0  20767  isdomn2  20769  opprdomn  20771  abvn0b  20772  znfld  20967  ply1domn  25488  fta1b  25534  prmidl0  32223  qsidomlem2  32226  isdomn4  40624  isdomn3  41517
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