ringadd2 - Metamath Proof Explorer

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Theorem ringadd2 19593

Description: A ring element plus itself is two times the element. (Contributed by Steve Rodriguez, 9-Sep-2007.) (Revised by Mario Carneiro, 22-Dec-2013.) (Revised by AV, 24-Aug-2021.)

**Hypotheses**
Ref	Expression
ringadd2.b	⊢ 𝐵 = (Base‘𝑅)
ringadd2.p	⊢ + = (+_g‘𝑅)
ringadd2.t	⊢ · = (._r‘𝑅)

**Assertion**
Ref	Expression
ringadd2	⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) → ∃𝑥 ∈ 𝐵 (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋))

Distinct variable groups: 𝑥,𝐵 𝑥,𝑅 𝑥,𝑋 𝑥, · Allowed substitution hint: + (𝑥)

**Proof of Theorem ringadd2**
Step	Hyp	Ref	Expression
1		ringadd2.b	. . 3 ⊢ 𝐵 = (Base‘𝑅)
2		ringadd2.t	. . 3 ⊢ · = (._r‘𝑅)
3	1, 2	ringid 19592	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) → ∃𝑥 ∈ 𝐵 ((𝑥 · 𝑋) = 𝑋 ∧ (𝑋 · 𝑥) = 𝑋))
4		oveq12 7222	. . . . . . 7 ⊢ (((𝑥 · 𝑋) = 𝑋 ∧ (𝑥 · 𝑋) = 𝑋) → ((𝑥 · 𝑋) + (𝑥 · 𝑋)) = (𝑋 + 𝑋))
5	4	anidms 570	. . . . . 6 ⊢ ((𝑥 · 𝑋) = 𝑋 → ((𝑥 · 𝑋) + (𝑥 · 𝑋)) = (𝑋 + 𝑋))
6	5	eqcomd 2743	. . . . 5 ⊢ ((𝑥 · 𝑋) = 𝑋 → (𝑋 + 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
7		simpll 767	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑅 ∈ Ring)
8		simpr 488	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
9		simplr 769	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑋 ∈ 𝐵)
10		ringadd2.p	. . . . . . . 8 ⊢ + = (+_g‘𝑅)
11	1, 10, 2	ringdir 19585	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵)) → ((𝑥 + 𝑥) · 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
12	7, 8, 8, 9, 11	syl13anc 1374	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑥 + 𝑥) · 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
13	12	eqeq2d 2748	. . . . 5 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋) ↔ (𝑋 + 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋))))
14	6, 13	syl5ibr 249	. . . 4 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑥 · 𝑋) = 𝑋 → (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋)))
15	14	adantrd 495	. . 3 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → (((𝑥 · 𝑋) = 𝑋 ∧ (𝑋 · 𝑥) = 𝑋) → (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋)))
16	15	reximdva 3193	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) → (∃𝑥 ∈ 𝐵 ((𝑥 · 𝑋) = 𝑋 ∧ (𝑋 · 𝑥) = 𝑋) → ∃𝑥 ∈ 𝐵 (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋)))
17	3, 16	mpd 15	1 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) → ∃𝑥 ∈ 𝐵 (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 399 = wceq 1543 ∈ wcel 2110 ∃wrex 3062 ‘cfv 6380 (class class class)co 7213 Basecbs 16760 +_gcplusg 16802 ._rcmulr 16803 Ringcrg 19562

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-sep 5192 ax-nul 5199 ax-pow 5258 ax-pr 5322 ax-un 7523 ax-cnex 10785 ax-resscn 10786 ax-1cn 10787 ax-icn 10788 ax-addcl 10789 ax-addrcl 10790 ax-mulcl 10791 ax-mulrcl 10792 ax-mulcom 10793 ax-addass 10794 ax-mulass 10795 ax-distr 10796 ax-i2m1 10797 ax-1ne0 10798 ax-1rid 10799 ax-rnegex 10800 ax-rrecex 10801 ax-cnre 10802 ax-pre-lttri 10803 ax-pre-lttrn 10804 ax-pre-ltadd 10805 ax-pre-mulgt0 10806

This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 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-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3066 df-rex 3067 df-reu 3068 df-rmo 3069 df-rab 3070 df-v 3410 df-sbc 3695 df-csb 3812 df-dif 3869 df-un 3871 df-in 3873 df-ss 3883 df-pss 3885 df-nul 4238 df-if 4440 df-pw 4515 df-sn 4542 df-pr 4544 df-tp 4546 df-op 4548 df-uni 4820 df-iun 4906 df-br 5054 df-opab 5116 df-mpt 5136 df-tr 5162 df-id 5455 df-eprel 5460 df-po 5468 df-so 5469 df-fr 5509 df-we 5511 df-xp 5557 df-rel 5558 df-cnv 5559 df-co 5560 df-dm 5561 df-rn 5562 df-res 5563 df-ima 5564 df-pred 6160 df-ord 6216 df-on 6217 df-lim 6218 df-suc 6219 df-iota 6338 df-fun 6382 df-fn 6383 df-f 6384 df-f1 6385 df-fo 6386 df-f1o 6387 df-fv 6388 df-riota 7170 df-ov 7216 df-oprab 7217 df-mpo 7218 df-om 7645 df-wrecs 8047 df-recs 8108 df-rdg 8146 df-er 8391 df-en 8627 df-dom 8628 df-sdom 8629 df-pnf 10869 df-mnf 10870 df-xr 10871 df-ltxr 10872 df-le 10873 df-sub 11064 df-neg 11065 df-nn 11831 df-2 11893 df-sets 16717 df-slot 16735 df-ndx 16745 df-base 16761 df-plusg 16815 df-0g 16946 df-mgm 18114 df-sgrp 18163 df-mnd 18174 df-mgp 19505 df-ur 19517 df-ring 19564

This theorem is referenced by: (None)

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