Users' Mathboxes Mathbox for Thierry Arnoux < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  isufd Structured version   Visualization version   GIF version

Theorem isufd 33511
Description: The property of being a Unique Factorization Domain. (Contributed by Thierry Arnoux, 1-Jun-2024.)
Hypotheses
Ref Expression
isufd.i 𝐼 = (PrmIdeal‘𝑅)
isufd.3 𝑃 = (RPrime‘𝑅)
isufd.0 0 = (0g𝑅)
Assertion
Ref Expression
isufd (𝑅 ∈ UFD ↔ (𝑅 ∈ IDomn ∧ ∀𝑖 ∈ (𝐼 ∖ {{ 0 }})(𝑖𝑃) ≠ ∅))
Distinct variable group:   𝑅,𝑖
Allowed substitution hints:   𝑃(𝑖)   𝐼(𝑖)   0 (𝑖)

Proof of Theorem isufd
Dummy variable 𝑟 is distinct from all other variables.
StepHypRef Expression
1 fveq2 6901 . . . . 5 (𝑟 = 𝑅 → (PrmIdeal‘𝑟) = (PrmIdeal‘𝑅))
2 isufd.i . . . . 5 𝐼 = (PrmIdeal‘𝑅)
31, 2eqtr4di 2791 . . . 4 (𝑟 = 𝑅 → (PrmIdeal‘𝑟) = 𝐼)
4 fveq2 6901 . . . . . . 7 (𝑟 = 𝑅 → (0g𝑟) = (0g𝑅))
5 isufd.0 . . . . . . 7 0 = (0g𝑅)
64, 5eqtr4di 2791 . . . . . 6 (𝑟 = 𝑅 → (0g𝑟) = 0 )
76sneqd 4642 . . . . 5 (𝑟 = 𝑅 → {(0g𝑟)} = { 0 })
87sneqd 4642 . . . 4 (𝑟 = 𝑅 → {{(0g𝑟)}} = {{ 0 }})
93, 8difeq12d 4137 . . 3 (𝑟 = 𝑅 → ((PrmIdeal‘𝑟) ∖ {{(0g𝑟)}}) = (𝐼 ∖ {{ 0 }}))
10 fveq2 6901 . . . . . 6 (𝑟 = 𝑅 → (RPrime‘𝑟) = (RPrime‘𝑅))
11 isufd.3 . . . . . 6 𝑃 = (RPrime‘𝑅)
1210, 11eqtr4di 2791 . . . . 5 (𝑟 = 𝑅 → (RPrime‘𝑟) = 𝑃)
1312ineq2d 4228 . . . 4 (𝑟 = 𝑅 → (𝑖 ∩ (RPrime‘𝑟)) = (𝑖𝑃))
1413neeq1d 2996 . . 3 (𝑟 = 𝑅 → ((𝑖 ∩ (RPrime‘𝑟)) ≠ ∅ ↔ (𝑖𝑃) ≠ ∅))
159, 14raleqbidv 3342 . 2 (𝑟 = 𝑅 → (∀𝑖 ∈ ((PrmIdeal‘𝑟) ∖ {{(0g𝑟)}})(𝑖 ∩ (RPrime‘𝑟)) ≠ ∅ ↔ ∀𝑖 ∈ (𝐼 ∖ {{ 0 }})(𝑖𝑃) ≠ ∅))
16 df-ufd 33510 . 2 UFD = {𝑟 ∈ IDomn ∣ ∀𝑖 ∈ ((PrmIdeal‘𝑟) ∖ {{(0g𝑟)}})(𝑖 ∩ (RPrime‘𝑟)) ≠ ∅}
1715, 16elrab2 3698 1 (𝑅 ∈ UFD ↔ (𝑅 ∈ IDomn ∧ ∀𝑖 ∈ (𝐼 ∖ {{ 0 }})(𝑖𝑃) ≠ ∅))
Colors of variables: wff setvar class
Syntax hints:  wb 206  wa 395   = wceq 1535  wcel 2104  wne 2936  wral 3057  cdif 3960  cin 3962  c0 4339  {csn 4630  cfv 6558  0gc0g 17475  RPrimecrpm 20434  IDomncidom 20691  PrmIdealcprmidl 33406  UFDcufd 33509
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1963  ax-7 2003  ax-8 2106  ax-9 2114  ax-ext 2704
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1087  df-tru 1538  df-fal 1548  df-ex 1775  df-sb 2061  df-clab 2711  df-cleq 2725  df-clel 2812  df-ne 2937  df-ral 3058  df-rab 3433  df-v 3479  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4531  df-sn 4631  df-pr 4633  df-op 4637  df-uni 4915  df-br 5150  df-iota 6510  df-fv 6566  df-ufd 33510
This theorem is referenced by:  ufdprmidl  33512  ufdidom  33513  pidufd  33514  1arithufdlem4  33518  dfufd2  33521
  Copyright terms: Public domain W3C validator