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Theorem uzlidlring 44419
Description: Only the zero (left) ideal or the unit (left) ideal of a domain is a unital ring. (Contributed by AV, 18-Feb-2020.)
Hypotheses
Ref Expression
lidlabl.l 𝐿 = (LIdeal‘𝑅)
lidlabl.i 𝐼 = (𝑅s 𝑈)
zlidlring.b 𝐵 = (Base‘𝑅)
zlidlring.0 0 = (0g𝑅)
Assertion
Ref Expression
uzlidlring ((𝑅 ∈ Domn ∧ 𝑈𝐿) → (𝐼 ∈ Ring ↔ (𝑈 = { 0 } ∨ 𝑈 = 𝐵)))

Proof of Theorem uzlidlring
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2824 . . 3 (Base‘𝐼) = (Base‘𝐼)
2 eqid 2824 . . 3 (.r𝐼) = (.r𝐼)
31, 2isringrng 44371 . 2 (𝐼 ∈ Ring ↔ (𝐼 ∈ Rng ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
4 domnring 20064 . . . . 5 (𝑅 ∈ Domn → 𝑅 ∈ Ring)
54anim1i 617 . . . 4 ((𝑅 ∈ Domn ∧ 𝑈𝐿) → (𝑅 ∈ Ring ∧ 𝑈𝐿))
6 lidlabl.l . . . . 5 𝐿 = (LIdeal‘𝑅)
7 lidlabl.i . . . . 5 𝐼 = (𝑅s 𝑈)
86, 7lidlrng 44417 . . . 4 ((𝑅 ∈ Ring ∧ 𝑈𝐿) → 𝐼 ∈ Rng)
95, 8syl 17 . . 3 ((𝑅 ∈ Domn ∧ 𝑈𝐿) → 𝐼 ∈ Rng)
10 ibar 532 . . . . . 6 (𝐼 ∈ Rng → (∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ (𝐼 ∈ Rng ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦))))
1110bicomd 226 . . . . 5 (𝐼 ∈ Rng → ((𝐼 ∈ Rng ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) ↔ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
1211adantl 485 . . . 4 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → ((𝐼 ∈ Rng ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) ↔ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
13 eqid 2824 . . . . . . . . . . . . . . . . . . . . 21 (.r𝑅) = (.r𝑅)
147, 13ressmulr 16623 . . . . . . . . . . . . . . . . . . . 20 (𝑈𝐿 → (.r𝑅) = (.r𝐼))
1514eqcomd 2830 . . . . . . . . . . . . . . . . . . 19 (𝑈𝐿 → (.r𝐼) = (.r𝑅))
1615oveqd 7163 . . . . . . . . . . . . . . . . . 18 (𝑈𝐿 → (𝑥(.r𝐼)𝑦) = (𝑥(.r𝑅)𝑦))
1716eqeq1d 2826 . . . . . . . . . . . . . . . . 17 (𝑈𝐿 → ((𝑥(.r𝐼)𝑦) = 𝑦 ↔ (𝑥(.r𝑅)𝑦) = 𝑦))
1815oveqd 7163 . . . . . . . . . . . . . . . . . 18 (𝑈𝐿 → (𝑦(.r𝐼)𝑥) = (𝑦(.r𝑅)𝑥))
1918eqeq1d 2826 . . . . . . . . . . . . . . . . 17 (𝑈𝐿 → ((𝑦(.r𝐼)𝑥) = 𝑦 ↔ (𝑦(.r𝑅)𝑥) = 𝑦))
2017, 19anbi12d 633 . . . . . . . . . . . . . . . 16 (𝑈𝐿 → (((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦)))
2120ad2antlr 726 . . . . . . . . . . . . . . 15 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦)))
2221ad2antrr 725 . . . . . . . . . . . . . 14 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → (((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦)))
2322ralbidv 3192 . . . . . . . . . . . . 13 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → (∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ ∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦)))
24 simp-4l 782 . . . . . . . . . . . . . 14 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → 𝑅 ∈ Domn)
256, 7lidlbas 44413 . . . . . . . . . . . . . . . . . . 19 (𝑈𝐿 → (Base‘𝐼) = 𝑈)
2625eleq1d 2900 . . . . . . . . . . . . . . . . . 18 (𝑈𝐿 → ((Base‘𝐼) ∈ 𝐿𝑈𝐿))
2726ibir 271 . . . . . . . . . . . . . . . . 17 (𝑈𝐿 → (Base‘𝐼) ∈ 𝐿)
2827ad3antlr 730 . . . . . . . . . . . . . . . 16 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) → (Base‘𝐼) ∈ 𝐿)
2925ad2antlr 726 . . . . . . . . . . . . . . . . . . . 20 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (Base‘𝐼) = 𝑈)
3029eqeq1d 2826 . . . . . . . . . . . . . . . . . . 19 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → ((Base‘𝐼) = { 0 } ↔ 𝑈 = { 0 }))
3130biimpd 232 . . . . . . . . . . . . . . . . . 18 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → ((Base‘𝐼) = { 0 } → 𝑈 = { 0 }))
3231necon3bd 3028 . . . . . . . . . . . . . . . . 17 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (¬ 𝑈 = { 0 } → (Base‘𝐼) ≠ { 0 }))
3332imp 410 . . . . . . . . . . . . . . . 16 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) → (Base‘𝐼) ≠ { 0 })
3428, 33jca 515 . . . . . . . . . . . . . . 15 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) → ((Base‘𝐼) ∈ 𝐿 ∧ (Base‘𝐼) ≠ { 0 }))
3534adantr 484 . . . . . . . . . . . . . 14 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → ((Base‘𝐼) ∈ 𝐿 ∧ (Base‘𝐼) ≠ { 0 }))
36 simpr 488 . . . . . . . . . . . . . 14 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → 𝑥 ∈ (Base‘𝐼))
37 eqid 2824 . . . . . . . . . . . . . . 15 (1r𝑅) = (1r𝑅)
38 zlidlring.0 . . . . . . . . . . . . . . 15 0 = (0g𝑅)
396, 13, 37, 38lidldomn1 44411 . . . . . . . . . . . . . 14 ((𝑅 ∈ Domn ∧ ((Base‘𝐼) ∈ 𝐿 ∧ (Base‘𝐼) ≠ { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → (∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦) → 𝑥 = (1r𝑅)))
4024, 35, 36, 39syl3anc 1368 . . . . . . . . . . . . 13 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → (∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦) → 𝑥 = (1r𝑅)))
4123, 40sylbid 243 . . . . . . . . . . . 12 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → (∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) → 𝑥 = (1r𝑅)))
4241imp 410 . . . . . . . . . . 11 ((((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) ∧ ∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) → 𝑥 = (1r𝑅))
4325ad3antlr 730 . . . . . . . . . . . . . . 15 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) → (Base‘𝐼) = 𝑈)
4443eleq2d 2901 . . . . . . . . . . . . . 14 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) → (𝑥 ∈ (Base‘𝐼) ↔ 𝑥𝑈))
4544biimpd 232 . . . . . . . . . . . . 13 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) → (𝑥 ∈ (Base‘𝐼) → 𝑥𝑈))
4645imp 410 . . . . . . . . . . . 12 (((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) → 𝑥𝑈)
4746adantr 484 . . . . . . . . . . 11 ((((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) ∧ ∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) → 𝑥𝑈)
4842, 47eqeltrrd 2917 . . . . . . . . . 10 ((((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) ∧ 𝑥 ∈ (Base‘𝐼)) ∧ ∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) → (1r𝑅) ∈ 𝑈)
4948rexlimdva2 3280 . . . . . . . . 9 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ¬ 𝑈 = { 0 }) → (∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) → (1r𝑅) ∈ 𝑈))
5049impancom 455 . . . . . . . 8 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) → (¬ 𝑈 = { 0 } → (1r𝑅) ∈ 𝑈))
515adantr 484 . . . . . . . . . 10 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (𝑅 ∈ Ring ∧ 𝑈𝐿))
52 zlidlring.b . . . . . . . . . . 11 𝐵 = (Base‘𝑅)
536, 52, 37lidl1el 19986 . . . . . . . . . 10 ((𝑅 ∈ Ring ∧ 𝑈𝐿) → ((1r𝑅) ∈ 𝑈𝑈 = 𝐵))
5451, 53syl 17 . . . . . . . . 9 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → ((1r𝑅) ∈ 𝑈𝑈 = 𝐵))
5554adantr 484 . . . . . . . 8 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) → ((1r𝑅) ∈ 𝑈𝑈 = 𝐵))
5650, 55sylibd 242 . . . . . . 7 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) → (¬ 𝑈 = { 0 } → 𝑈 = 𝐵))
5756orrd 860 . . . . . 6 ((((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) → (𝑈 = { 0 } ∨ 𝑈 = 𝐵))
5857ex 416 . . . . 5 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) → (𝑈 = { 0 } ∨ 𝑈 = 𝐵)))
596, 7, 52, 38zlidlring 44418 . . . . . . . . . 10 ((𝑅 ∈ Ring ∧ 𝑈 = { 0 }) → 𝐼 ∈ Ring)
603simprbi 500 . . . . . . . . . 10 (𝐼 ∈ Ring → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦))
6159, 60syl 17 . . . . . . . . 9 ((𝑅 ∈ Ring ∧ 𝑈 = { 0 }) → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦))
6261ex 416 . . . . . . . 8 (𝑅 ∈ Ring → (𝑈 = { 0 } → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
634, 62syl 17 . . . . . . 7 (𝑅 ∈ Domn → (𝑈 = { 0 } → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
6463ad2antrr 725 . . . . . 6 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (𝑈 = { 0 } → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
655anim1i 617 . . . . . . 7 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → ((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng))
6652, 13ringideu 19313 . . . . . . . . . . . 12 (𝑅 ∈ Ring → ∃!𝑥𝐵𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦))
67 reurex 3415 . . . . . . . . . . . 12 (∃!𝑥𝐵𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦) → ∃𝑥𝐵𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦))
6866, 67syl 17 . . . . . . . . . . 11 (𝑅 ∈ Ring → ∃𝑥𝐵𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦))
6968adantr 484 . . . . . . . . . 10 ((𝑅 ∈ Ring ∧ 𝑈𝐿) → ∃𝑥𝐵𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦))
7069ad2antrr 725 . . . . . . . . 9 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → ∃𝑥𝐵𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦))
717, 52ressbas 16552 . . . . . . . . . . . 12 (𝑈𝐿 → (𝑈𝐵) = (Base‘𝐼))
7271ad3antlr 730 . . . . . . . . . . 11 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → (𝑈𝐵) = (Base‘𝐼))
73 ineq1 4166 . . . . . . . . . . . . 13 (𝑈 = 𝐵 → (𝑈𝐵) = (𝐵𝐵))
74 inidm 4180 . . . . . . . . . . . . 13 (𝐵𝐵) = 𝐵
7573, 74syl6eq 2875 . . . . . . . . . . . 12 (𝑈 = 𝐵 → (𝑈𝐵) = 𝐵)
7675adantl 485 . . . . . . . . . . 11 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → (𝑈𝐵) = 𝐵)
7772, 76eqtr3d 2861 . . . . . . . . . 10 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → (Base‘𝐼) = 𝐵)
7820ad3antlr 730 . . . . . . . . . . 11 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → (((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦)))
7977, 78raleqbidv 3393 . . . . . . . . . 10 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → (∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ ∀𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦)))
8077, 79rexeqbidv 3394 . . . . . . . . 9 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → (∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ ∃𝑥𝐵𝑦𝐵 ((𝑥(.r𝑅)𝑦) = 𝑦 ∧ (𝑦(.r𝑅)𝑥) = 𝑦)))
8170, 80mpbird 260 . . . . . . . 8 ((((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) ∧ 𝑈 = 𝐵) → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦))
8281ex 416 . . . . . . 7 (((𝑅 ∈ Ring ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (𝑈 = 𝐵 → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
8365, 82syl 17 . . . . . 6 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (𝑈 = 𝐵 → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
8464, 83jaod 856 . . . . 5 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → ((𝑈 = { 0 } ∨ 𝑈 = 𝐵) → ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)))
8558, 84impbid 215 . . . 4 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → (∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦) ↔ (𝑈 = { 0 } ∨ 𝑈 = 𝐵)))
8612, 85bitrd 282 . . 3 (((𝑅 ∈ Domn ∧ 𝑈𝐿) ∧ 𝐼 ∈ Rng) → ((𝐼 ∈ Rng ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) ↔ (𝑈 = { 0 } ∨ 𝑈 = 𝐵)))
879, 86mpdan 686 . 2 ((𝑅 ∈ Domn ∧ 𝑈𝐿) → ((𝐼 ∈ Rng ∧ ∃𝑥 ∈ (Base‘𝐼)∀𝑦 ∈ (Base‘𝐼)((𝑥(.r𝐼)𝑦) = 𝑦 ∧ (𝑦(.r𝐼)𝑥) = 𝑦)) ↔ (𝑈 = { 0 } ∨ 𝑈 = 𝐵)))
883, 87syl5bb 286 1 ((𝑅 ∈ Domn ∧ 𝑈𝐿) → (𝐼 ∈ Ring ↔ (𝑈 = { 0 } ∨ 𝑈 = 𝐵)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wa 399  wo 844   = wceq 1538  wcel 2115  wne 3014  wral 3133  wrex 3134  ∃!wreu 3135  cin 3918  {csn 4550  cfv 6344  (class class class)co 7146  Basecbs 16481  s cress 16482  .rcmulr 16564  0gc0g 16711  1rcur 19249  Ringcrg 19295  LIdealclidl 19937  Domncdomn 20048  Rngcrng 44364
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 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-rep 5177  ax-sep 5190  ax-nul 5197  ax-pow 5254  ax-pr 5318  ax-un 7452  ax-cnex 10587  ax-resscn 10588  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-addrcl 10592  ax-mulcl 10593  ax-mulrcl 10594  ax-mulcom 10595  ax-addass 10596  ax-mulass 10597  ax-distr 10598  ax-i2m1 10599  ax-1ne0 10600  ax-1rid 10601  ax-rnegex 10602  ax-rrecex 10603  ax-cnre 10604  ax-pre-lttri 10605  ax-pre-lttrn 10606  ax-pre-ltadd 10607  ax-pre-mulgt0 10608
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ne 3015  df-nel 3119  df-ral 3138  df-rex 3139  df-reu 3140  df-rmo 3141  df-rab 3142  df-v 3482  df-sbc 3759  df-csb 3867  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-pss 3938  df-nul 4277  df-if 4451  df-pw 4524  df-sn 4551  df-pr 4553  df-tp 4555  df-op 4557  df-uni 4826  df-iun 4908  df-br 5054  df-opab 5116  df-mpt 5134  df-tr 5160  df-id 5448  df-eprel 5453  df-po 5462  df-so 5463  df-fr 5502  df-we 5504  df-xp 5549  df-rel 5550  df-cnv 5551  df-co 5552  df-dm 5553  df-rn 5554  df-res 5555  df-ima 5556  df-pred 6136  df-ord 6182  df-on 6183  df-lim 6184  df-suc 6185  df-iota 6303  df-fun 6346  df-fn 6347  df-f 6348  df-f1 6349  df-fo 6350  df-f1o 6351  df-fv 6352  df-riota 7104  df-ov 7149  df-oprab 7150  df-mpo 7151  df-om 7572  df-1st 7681  df-2nd 7682  df-wrecs 7939  df-recs 8000  df-rdg 8038  df-er 8281  df-en 8502  df-dom 8503  df-sdom 8504  df-pnf 10671  df-mnf 10672  df-xr 10673  df-ltxr 10674  df-le 10675  df-sub 10866  df-neg 10867  df-nn 11633  df-2 11695  df-3 11696  df-4 11697  df-5 11698  df-6 11699  df-7 11700  df-8 11701  df-ndx 16484  df-slot 16485  df-base 16487  df-sets 16488  df-ress 16489  df-plusg 16576  df-mulr 16577  df-sca 16579  df-vsca 16580  df-ip 16581  df-0g 16713  df-mgm 17850  df-sgrp 17899  df-mnd 17910  df-grp 18104  df-minusg 18105  df-sbg 18106  df-subg 18274  df-cmn 18906  df-abl 18907  df-mgp 19238  df-ur 19250  df-ring 19297  df-subrg 19528  df-lmod 19631  df-lss 19699  df-sra 19939  df-rgmod 19940  df-lidl 19941  df-nzr 20026  df-domn 20052  df-rng0 44365
This theorem is referenced by:  lidldomnnring  44420
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