Theorem domneq0 14504

Description: In a domain, a product is zero iff it has a zero factor. (Contributed by Mario Carneiro, 28-Mar-2015.)

Hypotheses

Ref	Expression
domneq0.b	⊢ 𝐵 = (Base‘𝑅)
domneq0.t	⊢ · = (.r‘𝑅)
domneq0.z	⊢ 0 = (0g‘𝑅)

Assertion

Ref	Expression
domneq0	⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 · 𝑌) = 0 ↔ (𝑋 = 0 ∨ 𝑌 = 0 )))

Proof of Theorem domneq0

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		3simpc 1023	. . 3 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵))
2		domneq0.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝑅)
3		domneq0.t	. . . . . 6 ⊢ · = (.r‘𝑅)
4		domneq0.z	. . . . . 6 ⊢ 0 = (0g‘𝑅)
5	2, 3, 4	isdomn 14501	. . . . 5 ⊢ (𝑅 ∈ Domn ↔ (𝑅 ∈ NzRing ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0 ∨ 𝑦 = 0 ))))
6	5	simprbi 275	. . . 4 ⊢ (𝑅 ∈ Domn → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0 ∨ 𝑦 = 0 )))
7	6	3ad2ant1 1045	. . 3 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0 ∨ 𝑦 = 0 )))
8		oveq1 6065	. . . . . 6 ⊢ (𝑥 = 𝑋 → (𝑥 · 𝑦) = (𝑋 · 𝑦))
9	8	eqeq1d 2243	. . . . 5 ⊢ (𝑥 = 𝑋 → ((𝑥 · 𝑦) = 0 ↔ (𝑋 · 𝑦) = 0 ))
10		eqeq1 2241	. . . . . 6 ⊢ (𝑥 = 𝑋 → (𝑥 = 0 ↔ 𝑋 = 0 ))
11	10	orbi1d 799	. . . . 5 ⊢ (𝑥 = 𝑋 → ((𝑥 = 0 ∨ 𝑦 = 0 ) ↔ (𝑋 = 0 ∨ 𝑦 = 0 )))
12	9, 11	imbi12d 234	. . . 4 ⊢ (𝑥 = 𝑋 → (((𝑥 · 𝑦) = 0 → (𝑥 = 0 ∨ 𝑦 = 0 )) ↔ ((𝑋 · 𝑦) = 0 → (𝑋 = 0 ∨ 𝑦 = 0 ))))
13		oveq2 6066	. . . . . 6 ⊢ (𝑦 = 𝑌 → (𝑋 · 𝑦) = (𝑋 · 𝑌))
14	13	eqeq1d 2243	. . . . 5 ⊢ (𝑦 = 𝑌 → ((𝑋 · 𝑦) = 0 ↔ (𝑋 · 𝑌) = 0 ))
15		eqeq1 2241	. . . . . 6 ⊢ (𝑦 = 𝑌 → (𝑦 = 0 ↔ 𝑌 = 0 ))
16	15	orbi2d 798	. . . . 5 ⊢ (𝑦 = 𝑌 → ((𝑋 = 0 ∨ 𝑦 = 0 ) ↔ (𝑋 = 0 ∨ 𝑌 = 0 )))
17	14, 16	imbi12d 234	. . . 4 ⊢ (𝑦 = 𝑌 → (((𝑋 · 𝑦) = 0 → (𝑋 = 0 ∨ 𝑦 = 0 )) ↔ ((𝑋 · 𝑌) = 0 → (𝑋 = 0 ∨ 𝑌 = 0 ))))
18	12, 17	rspc2va 2938	. . 3 ⊢ (((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝑥 · 𝑦) = 0 → (𝑥 = 0 ∨ 𝑦 = 0 ))) → ((𝑋 · 𝑌) = 0 → (𝑋 = 0 ∨ 𝑌 = 0 )))
19	1, 7, 18	syl2anc 411	. 2 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 · 𝑌) = 0 → (𝑋 = 0 ∨ 𝑌 = 0 )))
20		domnring 14503	. . . . . 6 ⊢ (𝑅 ∈ Domn → 𝑅 ∈ Ring)
21	20	3ad2ant1 1045	. . . . 5 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → 𝑅 ∈ Ring)
22		simp3 1026	. . . . 5 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → 𝑌 ∈ 𝐵)
23	2, 3, 4	ringlz 14271	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑌 ∈ 𝐵) → ( 0 · 𝑌) = 0 )
24	21, 22, 23	syl2anc 411	. . . 4 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ( 0 · 𝑌) = 0 )
25		oveq1 6065	. . . . 5 ⊢ (𝑋 = 0 → (𝑋 · 𝑌) = ( 0 · 𝑌))
26	25	eqeq1d 2243	. . . 4 ⊢ (𝑋 = 0 → ((𝑋 · 𝑌) = 0 ↔ ( 0 · 𝑌) = 0 ))
27	24, 26	syl5ibrcom 157	. . 3 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 = 0 → (𝑋 · 𝑌) = 0 ))
28		simp2 1025	. . . . 5 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → 𝑋 ∈ 𝐵)
29	2, 3, 4	ringrz 14272	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) → (𝑋 · 0 ) = 0 )
30	21, 28, 29	syl2anc 411	. . . 4 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 · 0 ) = 0 )
31		oveq2 6066	. . . . 5 ⊢ (𝑌 = 0 → (𝑋 · 𝑌) = (𝑋 · 0 ))
32	31	eqeq1d 2243	. . . 4 ⊢ (𝑌 = 0 → ((𝑋 · 𝑌) = 0 ↔ (𝑋 · 0 ) = 0 ))
33	30, 32	syl5ibrcom 157	. . 3 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑌 = 0 → (𝑋 · 𝑌) = 0 ))
34	27, 33	jaod 725	. 2 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 = 0 ∨ 𝑌 = 0 ) → (𝑋 · 𝑌) = 0 ))
35	19, 34	impbid 129	1 ⊢ ((𝑅 ∈ Domn ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 · 𝑌) = 0 ↔ (𝑋 = 0 ∨ 𝑌 = 0 )))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   ∨ wo 716   ∧ w3a 1005   = wceq 1398   ∈ wcel 2205  ∀wral 2522  ‘cfv 5357  (class class class)co 6058  Basecbs 13296  ._rcmulr 13375  0_gc0g 13553  Ringcrg 14224  NzRingcnzr 14409  Domncdomn 14487

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-pre-ltirr 8255  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-pnf 8326  df-mnf 8327  df-ltxr 8329  df-inn 9255  df-2 9313  df-3 9314  df-ndx 13299  df-slot 13300  df-base 13302  df-sets 13303  df-plusg 13387  df-mulr 13388  df-0g 13555  df-mgm 13653  df-sgrp 13699  df-mnd 13714  df-grp 13800  df-minusg 13801  df-mgp 14149  df-ring 14226  df-nzr 14410  df-domn 14490

This theorem is referenced by:  domnmuln0  14505  znidomb  14918