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Theorem isfldidl 33997
Description: Determine if a ring is a field based on its ideals. (Contributed by Jeff Madsen, 10-Jun-2010.)
Hypotheses
Ref Expression
isfldidl.1 𝐺 = (1st𝐾)
isfldidl.2 𝐻 = (2nd𝐾)
isfldidl.3 𝑋 = ran 𝐺
isfldidl.4 𝑍 = (GId‘𝐺)
isfldidl.5 𝑈 = (GId‘𝐻)
Assertion
Ref Expression
isfldidl (𝐾 ∈ Fld ↔ (𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}))

Proof of Theorem isfldidl
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fldcrng 33933 . . 3 (𝐾 ∈ Fld → 𝐾 ∈ CRingOps)
2 flddivrng 33928 . . . 4 (𝐾 ∈ Fld → 𝐾 ∈ DivRingOps)
3 isfldidl.1 . . . . 5 𝐺 = (1st𝐾)
4 isfldidl.2 . . . . 5 𝐻 = (2nd𝐾)
5 isfldidl.3 . . . . 5 𝑋 = ran 𝐺
6 isfldidl.4 . . . . 5 𝑍 = (GId‘𝐺)
7 isfldidl.5 . . . . 5 𝑈 = (GId‘𝐻)
83, 4, 5, 6, 7dvrunz 33883 . . . 4 (𝐾 ∈ DivRingOps → 𝑈𝑍)
92, 8syl 17 . . 3 (𝐾 ∈ Fld → 𝑈𝑍)
103, 4, 5, 6divrngidl 33957 . . . 4 (𝐾 ∈ DivRingOps → (Idl‘𝐾) = {{𝑍}, 𝑋})
112, 10syl 17 . . 3 (𝐾 ∈ Fld → (Idl‘𝐾) = {{𝑍}, 𝑋})
121, 9, 113jca 1261 . 2 (𝐾 ∈ Fld → (𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}))
13 crngorngo 33929 . . . . . 6 (𝐾 ∈ CRingOps → 𝐾 ∈ RingOps)
14133ad2ant1 1102 . . . . 5 ((𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → 𝐾 ∈ RingOps)
15 simp2 1082 . . . . 5 ((𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → 𝑈𝑍)
163rneqi 5384 . . . . . . . . . . . . . . 15 ran 𝐺 = ran (1st𝐾)
175, 16eqtri 2673 . . . . . . . . . . . . . 14 𝑋 = ran (1st𝐾)
1817, 4, 7rngo1cl 33868 . . . . . . . . . . . . 13 (𝐾 ∈ RingOps → 𝑈𝑋)
1913, 18syl 17 . . . . . . . . . . . 12 (𝐾 ∈ CRingOps → 𝑈𝑋)
2019ad2antrr 762 . . . . . . . . . . 11 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → 𝑈𝑋)
21 eldif 3617 . . . . . . . . . . . . . . . 16 (𝑥 ∈ (𝑋 ∖ {𝑍}) ↔ (𝑥𝑋 ∧ ¬ 𝑥 ∈ {𝑍}))
22 snssi 4371 . . . . . . . . . . . . . . . . . . 19 (𝑥𝑋 → {𝑥} ⊆ 𝑋)
233, 5igenss 33991 . . . . . . . . . . . . . . . . . . 19 ((𝐾 ∈ RingOps ∧ {𝑥} ⊆ 𝑋) → {𝑥} ⊆ (𝐾 IdlGen {𝑥}))
2422, 23sylan2 490 . . . . . . . . . . . . . . . . . 18 ((𝐾 ∈ RingOps ∧ 𝑥𝑋) → {𝑥} ⊆ (𝐾 IdlGen {𝑥}))
25 vex 3234 . . . . . . . . . . . . . . . . . . . . . 22 𝑥 ∈ V
2625snss 4348 . . . . . . . . . . . . . . . . . . . . 21 (𝑥 ∈ (𝐾 IdlGen {𝑥}) ↔ {𝑥} ⊆ (𝐾 IdlGen {𝑥}))
2726biimpri 218 . . . . . . . . . . . . . . . . . . . 20 ({𝑥} ⊆ (𝐾 IdlGen {𝑥}) → 𝑥 ∈ (𝐾 IdlGen {𝑥}))
28 eleq2 2719 . . . . . . . . . . . . . . . . . . . 20 ((𝐾 IdlGen {𝑥}) = {𝑍} → (𝑥 ∈ (𝐾 IdlGen {𝑥}) ↔ 𝑥 ∈ {𝑍}))
2927, 28syl5ibcom 235 . . . . . . . . . . . . . . . . . . 19 ({𝑥} ⊆ (𝐾 IdlGen {𝑥}) → ((𝐾 IdlGen {𝑥}) = {𝑍} → 𝑥 ∈ {𝑍}))
3029con3dimp 456 . . . . . . . . . . . . . . . . . 18 (({𝑥} ⊆ (𝐾 IdlGen {𝑥}) ∧ ¬ 𝑥 ∈ {𝑍}) → ¬ (𝐾 IdlGen {𝑥}) = {𝑍})
3124, 30sylan 487 . . . . . . . . . . . . . . . . 17 (((𝐾 ∈ RingOps ∧ 𝑥𝑋) ∧ ¬ 𝑥 ∈ {𝑍}) → ¬ (𝐾 IdlGen {𝑥}) = {𝑍})
3231anasss 680 . . . . . . . . . . . . . . . 16 ((𝐾 ∈ RingOps ∧ (𝑥𝑋 ∧ ¬ 𝑥 ∈ {𝑍})) → ¬ (𝐾 IdlGen {𝑥}) = {𝑍})
3321, 32sylan2b 491 . . . . . . . . . . . . . . 15 ((𝐾 ∈ RingOps ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → ¬ (𝐾 IdlGen {𝑥}) = {𝑍})
3433adantlr 751 . . . . . . . . . . . . . 14 (((𝐾 ∈ RingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → ¬ (𝐾 IdlGen {𝑥}) = {𝑍})
35 eldifi 3765 . . . . . . . . . . . . . . . . . . . . 21 (𝑥 ∈ (𝑋 ∖ {𝑍}) → 𝑥𝑋)
3635snssd 4372 . . . . . . . . . . . . . . . . . . . 20 (𝑥 ∈ (𝑋 ∖ {𝑍}) → {𝑥} ⊆ 𝑋)
373, 5igenidl 33992 . . . . . . . . . . . . . . . . . . . 20 ((𝐾 ∈ RingOps ∧ {𝑥} ⊆ 𝑋) → (𝐾 IdlGen {𝑥}) ∈ (Idl‘𝐾))
3836, 37sylan2 490 . . . . . . . . . . . . . . . . . . 19 ((𝐾 ∈ RingOps ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (𝐾 IdlGen {𝑥}) ∈ (Idl‘𝐾))
39 eleq2 2719 . . . . . . . . . . . . . . . . . . 19 ((Idl‘𝐾) = {{𝑍}, 𝑋} → ((𝐾 IdlGen {𝑥}) ∈ (Idl‘𝐾) ↔ (𝐾 IdlGen {𝑥}) ∈ {{𝑍}, 𝑋}))
4038, 39syl5ibcom 235 . . . . . . . . . . . . . . . . . 18 ((𝐾 ∈ RingOps ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → ((Idl‘𝐾) = {{𝑍}, 𝑋} → (𝐾 IdlGen {𝑥}) ∈ {{𝑍}, 𝑋}))
4140imp 444 . . . . . . . . . . . . . . . . 17 (((𝐾 ∈ RingOps ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → (𝐾 IdlGen {𝑥}) ∈ {{𝑍}, 𝑋})
4241an32s 863 . . . . . . . . . . . . . . . 16 (((𝐾 ∈ RingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (𝐾 IdlGen {𝑥}) ∈ {{𝑍}, 𝑋})
43 ovex 6718 . . . . . . . . . . . . . . . . 17 (𝐾 IdlGen {𝑥}) ∈ V
4443elpr 4231 . . . . . . . . . . . . . . . 16 ((𝐾 IdlGen {𝑥}) ∈ {{𝑍}, 𝑋} ↔ ((𝐾 IdlGen {𝑥}) = {𝑍} ∨ (𝐾 IdlGen {𝑥}) = 𝑋))
4542, 44sylib 208 . . . . . . . . . . . . . . 15 (((𝐾 ∈ RingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → ((𝐾 IdlGen {𝑥}) = {𝑍} ∨ (𝐾 IdlGen {𝑥}) = 𝑋))
4645ord 391 . . . . . . . . . . . . . 14 (((𝐾 ∈ RingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (¬ (𝐾 IdlGen {𝑥}) = {𝑍} → (𝐾 IdlGen {𝑥}) = 𝑋))
4734, 46mpd 15 . . . . . . . . . . . . 13 (((𝐾 ∈ RingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (𝐾 IdlGen {𝑥}) = 𝑋)
4813, 47sylanl1 683 . . . . . . . . . . . 12 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (𝐾 IdlGen {𝑥}) = 𝑋)
493, 4, 5prnc 33996 . . . . . . . . . . . . . 14 ((𝐾 ∈ CRingOps ∧ 𝑥𝑋) → (𝐾 IdlGen {𝑥}) = {𝑧𝑋 ∣ ∃𝑦𝑋 𝑧 = (𝑦𝐻𝑥)})
5035, 49sylan2 490 . . . . . . . . . . . . 13 ((𝐾 ∈ CRingOps ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (𝐾 IdlGen {𝑥}) = {𝑧𝑋 ∣ ∃𝑦𝑋 𝑧 = (𝑦𝐻𝑥)})
5150adantlr 751 . . . . . . . . . . . 12 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (𝐾 IdlGen {𝑥}) = {𝑧𝑋 ∣ ∃𝑦𝑋 𝑧 = (𝑦𝐻𝑥)})
5248, 51eqtr3d 2687 . . . . . . . . . . 11 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → 𝑋 = {𝑧𝑋 ∣ ∃𝑦𝑋 𝑧 = (𝑦𝐻𝑥)})
5320, 52eleqtrd 2732 . . . . . . . . . 10 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → 𝑈 ∈ {𝑧𝑋 ∣ ∃𝑦𝑋 𝑧 = (𝑦𝐻𝑥)})
54 eqeq1 2655 . . . . . . . . . . . 12 (𝑧 = 𝑈 → (𝑧 = (𝑦𝐻𝑥) ↔ 𝑈 = (𝑦𝐻𝑥)))
5554rexbidv 3081 . . . . . . . . . . 11 (𝑧 = 𝑈 → (∃𝑦𝑋 𝑧 = (𝑦𝐻𝑥) ↔ ∃𝑦𝑋 𝑈 = (𝑦𝐻𝑥)))
5655elrab 3396 . . . . . . . . . 10 (𝑈 ∈ {𝑧𝑋 ∣ ∃𝑦𝑋 𝑧 = (𝑦𝐻𝑥)} ↔ (𝑈𝑋 ∧ ∃𝑦𝑋 𝑈 = (𝑦𝐻𝑥)))
5753, 56sylib 208 . . . . . . . . 9 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → (𝑈𝑋 ∧ ∃𝑦𝑋 𝑈 = (𝑦𝐻𝑥)))
5857simprd 478 . . . . . . . 8 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → ∃𝑦𝑋 𝑈 = (𝑦𝐻𝑥))
59 eqcom 2658 . . . . . . . . 9 ((𝑦𝐻𝑥) = 𝑈𝑈 = (𝑦𝐻𝑥))
6059rexbii 3070 . . . . . . . 8 (∃𝑦𝑋 (𝑦𝐻𝑥) = 𝑈 ↔ ∃𝑦𝑋 𝑈 = (𝑦𝐻𝑥))
6158, 60sylibr 224 . . . . . . 7 (((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) ∧ 𝑥 ∈ (𝑋 ∖ {𝑍})) → ∃𝑦𝑋 (𝑦𝐻𝑥) = 𝑈)
6261ralrimiva 2995 . . . . . 6 ((𝐾 ∈ CRingOps ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → ∀𝑥 ∈ (𝑋 ∖ {𝑍})∃𝑦𝑋 (𝑦𝐻𝑥) = 𝑈)
63623adant2 1100 . . . . 5 ((𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → ∀𝑥 ∈ (𝑋 ∖ {𝑍})∃𝑦𝑋 (𝑦𝐻𝑥) = 𝑈)
6414, 15, 63jca32 557 . . . 4 ((𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → (𝐾 ∈ RingOps ∧ (𝑈𝑍 ∧ ∀𝑥 ∈ (𝑋 ∖ {𝑍})∃𝑦𝑋 (𝑦𝐻𝑥) = 𝑈)))
653, 4, 6, 5, 7isdrngo3 33888 . . . 4 (𝐾 ∈ DivRingOps ↔ (𝐾 ∈ RingOps ∧ (𝑈𝑍 ∧ ∀𝑥 ∈ (𝑋 ∖ {𝑍})∃𝑦𝑋 (𝑦𝐻𝑥) = 𝑈)))
6664, 65sylibr 224 . . 3 ((𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → 𝐾 ∈ DivRingOps)
67 simp1 1081 . . 3 ((𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → 𝐾 ∈ CRingOps)
68 isfld2 33934 . . 3 (𝐾 ∈ Fld ↔ (𝐾 ∈ DivRingOps ∧ 𝐾 ∈ CRingOps))
6966, 67, 68sylanbrc 699 . 2 ((𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}) → 𝐾 ∈ Fld)
7012, 69impbii 199 1 (𝐾 ∈ Fld ↔ (𝐾 ∈ CRingOps ∧ 𝑈𝑍 ∧ (Idl‘𝐾) = {{𝑍}, 𝑋}))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 196  wo 382  wa 383  w3a 1054   = wceq 1523  wcel 2030  wne 2823  wral 2941  wrex 2942  {crab 2945  cdif 3604  wss 3607  {csn 4210  {cpr 4212  ran crn 5144  cfv 5926  (class class class)co 6690  1st c1st 7208  2nd c2nd 7209  GIdcgi 27472  RingOpscrngo 33823  DivRingOpscdrng 33877  Fldcfld 33920  CRingOpsccring 33922  Idlcidl 33936   IdlGen cigen 33988
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-1o 7605  df-er 7787  df-en 7998  df-dom 7999  df-sdom 8000  df-fin 8001  df-grpo 27475  df-gid 27476  df-ginv 27477  df-ablo 27527  df-ass 33772  df-exid 33774  df-mgmOLD 33778  df-sgrOLD 33790  df-mndo 33796  df-rngo 33824  df-drngo 33878  df-com2 33919  df-fld 33921  df-crngo 33923  df-idl 33939  df-igen 33989
This theorem is referenced by:  isfldidl2  33998
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