ringadd2 - Metamath Proof Explorer

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Theorem ringadd2 19038

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 19037	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) → ∃𝑥 ∈ 𝐵 ((𝑥 · 𝑋) = 𝑋 ∧ (𝑋 · 𝑥) = 𝑋))
4		oveq12 6979	. . . . . . 7 ⊢ (((𝑥 · 𝑋) = 𝑋 ∧ (𝑥 · 𝑋) = 𝑋) → ((𝑥 · 𝑋) + (𝑥 · 𝑋)) = (𝑋 + 𝑋))
5	4	anidms 559	. . . . . 6 ⊢ ((𝑥 · 𝑋) = 𝑋 → ((𝑥 · 𝑋) + (𝑥 · 𝑋)) = (𝑋 + 𝑋))
6	5	eqcomd 2778	. . . . 5 ⊢ ((𝑥 · 𝑋) = 𝑋 → (𝑋 + 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
7		simpll 754	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑅 ∈ Ring)
8		simpr 477	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
9		simplr 756	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑋 ∈ 𝐵)
10		ringadd2.p	. . . . . . . 8 ⊢ + = (+_g‘𝑅)
11	1, 10, 2	ringdir 19030	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵)) → ((𝑥 + 𝑥) · 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
12	7, 8, 8, 9, 11	syl13anc 1352	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑥 + 𝑥) · 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
13	12	eqeq2d 2782	. . . . 5 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋) ↔ (𝑋 + 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋))))
14	6, 13	syl5ibr 238	. . . 4 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑥 · 𝑋) = 𝑋 → (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋)))
15	14	adantrd 484	. . 3 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → (((𝑥 · 𝑋) = 𝑋 ∧ (𝑋 · 𝑥) = 𝑋) → (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋)))
16	15	reximdva 3213	. 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 387 = wceq 1507 ∈ wcel 2048 ∃wrex 3083 ‘cfv 6182 (class class class)co 6970 Basecbs 16329 +_gcplusg 16411 ._rcmulr 16412 Ringcrg 19010

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1758 ax-4 1772 ax-5 1869 ax-6 1928 ax-7 1964 ax-8 2050 ax-9 2057 ax-10 2077 ax-11 2091 ax-12 2104 ax-13 2299 ax-ext 2745 ax-sep 5054 ax-nul 5061 ax-pow 5113 ax-pr 5180 ax-un 7273 ax-cnex 10383 ax-resscn 10384 ax-1cn 10385 ax-icn 10386 ax-addcl 10387 ax-addrcl 10388 ax-mulcl 10389 ax-mulrcl 10390 ax-mulcom 10391 ax-addass 10392 ax-mulass 10393 ax-distr 10394 ax-i2m1 10395 ax-1ne0 10396 ax-1rid 10397 ax-rnegex 10398 ax-rrecex 10399 ax-cnre 10400 ax-pre-lttri 10401 ax-pre-lttrn 10402 ax-pre-ltadd 10403 ax-pre-mulgt0 10404

This theorem depends on definitions: df-bi 199 df-an 388 df-or 834 df-3or 1069 df-3an 1070 df-tru 1510 df-ex 1743 df-nf 1747 df-sb 2014 df-mo 2544 df-eu 2580 df-clab 2754 df-cleq 2765 df-clel 2840 df-nfc 2912 df-ne 2962 df-nel 3068 df-ral 3087 df-rex 3088 df-reu 3089 df-rmo 3090 df-rab 3091 df-v 3411 df-sbc 3678 df-csb 3783 df-dif 3828 df-un 3830 df-in 3832 df-ss 3839 df-pss 3841 df-nul 4174 df-if 4345 df-pw 4418 df-sn 4436 df-pr 4438 df-tp 4440 df-op 4442 df-uni 4707 df-iun 4788 df-br 4924 df-opab 4986 df-mpt 5003 df-tr 5025 df-id 5305 df-eprel 5310 df-po 5319 df-so 5320 df-fr 5359 df-we 5361 df-xp 5406 df-rel 5407 df-cnv 5408 df-co 5409 df-dm 5410 df-rn 5411 df-res 5412 df-ima 5413 df-pred 5980 df-ord 6026 df-on 6027 df-lim 6028 df-suc 6029 df-iota 6146 df-fun 6184 df-fn 6185 df-f 6186 df-f1 6187 df-fo 6188 df-f1o 6189 df-fv 6190 df-riota 6931 df-ov 6973 df-oprab 6974 df-mpo 6975 df-om 7391 df-wrecs 7743 df-recs 7805 df-rdg 7843 df-er 8081 df-en 8299 df-dom 8300 df-sdom 8301 df-pnf 10468 df-mnf 10469 df-xr 10470 df-ltxr 10471 df-le 10472 df-sub 10664 df-neg 10665 df-nn 11432 df-2 11496 df-ndx 16332 df-slot 16333 df-base 16335 df-sets 16336 df-plusg 16424 df-0g 16561 df-mgm 17700 df-sgrp 17742 df-mnd 17753 df-mgp 18953 df-ur 18965 df-ring 19012

This theorem is referenced by: (None)

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