Theorem srglz 19542

Description: The zero of a semiring is a left-absorbing element. (Contributed by AV, 23-Aug-2019.)

Hypotheses

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

Assertion

Ref	Expression
srglz	⊢ ((𝑅 ∈ SRing ∧ 𝑋 ∈ 𝐵) → ( 0 · 𝑋) = 0 )

Proof of Theorem srglz

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

Step	Hyp	Ref	Expression
1		srgz.b	. . . . . . 7 ⊢ 𝐵 = (Base‘𝑅)
2		eqid 2737	. . . . . . 7 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅)
3		eqid 2737	. . . . . . 7 ⊢ (+g‘𝑅) = (+g‘𝑅)
4		srgz.t	. . . . . . 7 ⊢ · = (.r‘𝑅)
5		srgz.z	. . . . . . 7 ⊢ 0 = (0g‘𝑅)
6	1, 2, 3, 4, 5	issrg 19522	. . . . . 6 ⊢ (𝑅 ∈ SRing ↔ (𝑅 ∈ CMnd ∧ (mulGrp‘𝑅) ∈ Mnd ∧ ∀𝑥 ∈ 𝐵 (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ((𝑥 · (𝑦(+g‘𝑅)𝑧)) = ((𝑥 · 𝑦)(+g‘𝑅)(𝑥 · 𝑧)) ∧ ((𝑥(+g‘𝑅)𝑦) · 𝑧) = ((𝑥 · 𝑧)(+g‘𝑅)(𝑦 · 𝑧))) ∧ (( 0 · 𝑥) = 0 ∧ (𝑥 · 0 ) = 0 ))))
7	6	simp3bi 1149	. . . . 5 ⊢ (𝑅 ∈ SRing → ∀𝑥 ∈ 𝐵 (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ((𝑥 · (𝑦(+g‘𝑅)𝑧)) = ((𝑥 · 𝑦)(+g‘𝑅)(𝑥 · 𝑧)) ∧ ((𝑥(+g‘𝑅)𝑦) · 𝑧) = ((𝑥 · 𝑧)(+g‘𝑅)(𝑦 · 𝑧))) ∧ (( 0 · 𝑥) = 0 ∧ (𝑥 · 0 ) = 0 )))
8	7	r19.21bi 3130	. . . 4 ⊢ ((𝑅 ∈ SRing ∧ 𝑥 ∈ 𝐵) → (∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ((𝑥 · (𝑦(+g‘𝑅)𝑧)) = ((𝑥 · 𝑦)(+g‘𝑅)(𝑥 · 𝑧)) ∧ ((𝑥(+g‘𝑅)𝑦) · 𝑧) = ((𝑥 · 𝑧)(+g‘𝑅)(𝑦 · 𝑧))) ∧ (( 0 · 𝑥) = 0 ∧ (𝑥 · 0 ) = 0 )))
9	8	simprld 772	. . 3 ⊢ ((𝑅 ∈ SRing ∧ 𝑥 ∈ 𝐵) → ( 0 · 𝑥) = 0 )
10	9	ralrimiva 3105	. 2 ⊢ (𝑅 ∈ SRing → ∀𝑥 ∈ 𝐵 ( 0 · 𝑥) = 0 )
11		oveq2 7221	. . . 4 ⊢ (𝑥 = 𝑋 → ( 0 · 𝑥) = ( 0 · 𝑋))
12	11	eqeq1d 2739	. . 3 ⊢ (𝑥 = 𝑋 → (( 0 · 𝑥) = 0 ↔ ( 0 · 𝑋) = 0 ))
13	12	rspcv 3532	. 2 ⊢ (𝑋 ∈ 𝐵 → (∀𝑥 ∈ 𝐵 ( 0 · 𝑥) = 0 → ( 0 · 𝑋) = 0 ))
14	10, 13	mpan9 510	1 ⊢ ((𝑅 ∈ SRing ∧ 𝑋 ∈ 𝐵) → ( 0 · 𝑋) = 0 )

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1543   ∈ wcel 2110  ∀wral 3061  ‘cfv 6380  (class class class)co 7213  Basecbs 16760  +_gcplusg 16802  ._rcmulr 16803  0_gc0g 16944  Mndcmnd 18173  CMndccmn 19170  mulGrpcmgp 19504  SRingcsrg 19520

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2708  ax-nul 5199

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2071  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2816  df-ral 3066  df-rex 3067  df-rab 3070  df-v 3410  df-sbc 3695  df-dif 3869  df-un 3871  df-in 3873  df-ss 3883  df-nul 4238  df-if 4440  df-sn 4542  df-pr 4544  df-op 4548  df-uni 4820  df-br 5054  df-iota 6338  df-fv 6388  df-ov 7216  df-srg 19521

This theorem is referenced by:  srgmulgass  19546  srgrmhm  19551