ringadd2 - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > ringadd2		Structured version Visualization version GIF version

Theorem ringadd2 19859

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 19858	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) → ∃𝑥 ∈ 𝐵 ((𝑥 · 𝑋) = 𝑋 ∧ (𝑋 · 𝑥) = 𝑋))
4		oveq12 7316	. . . . . . 7 ⊢ (((𝑥 · 𝑋) = 𝑋 ∧ (𝑥 · 𝑋) = 𝑋) → ((𝑥 · 𝑋) + (𝑥 · 𝑋)) = (𝑋 + 𝑋))
5	4	anidms 568	. . . . . 6 ⊢ ((𝑥 · 𝑋) = 𝑋 → ((𝑥 · 𝑋) + (𝑥 · 𝑋)) = (𝑋 + 𝑋))
6	5	eqcomd 2742	. . . . 5 ⊢ ((𝑥 · 𝑋) = 𝑋 → (𝑋 + 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
7		simpll 765	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑅 ∈ Ring)
8		simpr 486	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
9		simplr 767	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → 𝑋 ∈ 𝐵)
10		ringadd2.p	. . . . . . . 8 ⊢ + = (+_g‘𝑅)
11	1, 10, 2	ringdir 19851	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵)) → ((𝑥 + 𝑥) · 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
12	7, 8, 8, 9, 11	syl13anc 1372	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑥 + 𝑥) · 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋)))
13	12	eqeq2d 2747	. . . . 5 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋) ↔ (𝑋 + 𝑋) = ((𝑥 · 𝑋) + (𝑥 · 𝑋))))
14	6, 13	syl5ibr 246	. . . 4 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → ((𝑥 · 𝑋) = 𝑋 → (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋)))
15	14	adantrd 493	. . 3 ⊢ (((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵) ∧ 𝑥 ∈ 𝐵) → (((𝑥 · 𝑋) = 𝑋 ∧ (𝑋 · 𝑥) = 𝑋) → (𝑋 + 𝑋) = ((𝑥 + 𝑥) · 𝑋)))
16	15	reximdva 3162	. 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 397 = wceq 1539 ∈ wcel 2104 ∃wrex 3071 ‘cfv 6458 (class class class)co 7307 Basecbs 16957 +_gcplusg 17007 ._rcmulr 17008 Ringcrg 19828

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2707 ax-sep 5232 ax-nul 5239 ax-pow 5297 ax-pr 5361 ax-un 7620 ax-cnex 10973 ax-resscn 10974 ax-1cn 10975 ax-icn 10976 ax-addcl 10977 ax-addrcl 10978 ax-mulcl 10979 ax-mulrcl 10980 ax-mulcom 10981 ax-addass 10982 ax-mulass 10983 ax-distr 10984 ax-i2m1 10985 ax-1ne0 10986 ax-1rid 10987 ax-rnegex 10988 ax-rrecex 10989 ax-cnre 10990 ax-pre-lttri 10991 ax-pre-lttrn 10992 ax-pre-ltadd 10993 ax-pre-mulgt0 10994

This theorem depends on definitions: df-bi 206 df-an 398 df-or 846 df-3or 1088 df-3an 1089 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2538 df-eu 2567 df-clab 2714 df-cleq 2728 df-clel 2814 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3285 df-reu 3286 df-rab 3287 df-v 3439 df-sbc 3722 df-csb 3838 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-pss 3911 df-nul 4263 df-if 4466 df-pw 4541 df-sn 4566 df-pr 4568 df-op 4572 df-uni 4845 df-iun 4933 df-br 5082 df-opab 5144 df-mpt 5165 df-tr 5199 df-id 5500 df-eprel 5506 df-po 5514 df-so 5515 df-fr 5555 df-we 5557 df-xp 5606 df-rel 5607 df-cnv 5608 df-co 5609 df-dm 5610 df-rn 5611 df-res 5612 df-ima 5613 df-pred 6217 df-ord 6284 df-on 6285 df-lim 6286 df-suc 6287 df-iota 6410 df-fun 6460 df-fn 6461 df-f 6462 df-f1 6463 df-fo 6464 df-f1o 6465 df-fv 6466 df-riota 7264 df-ov 7310 df-oprab 7311 df-mpo 7312 df-om 7745 df-2nd 7864 df-frecs 8128 df-wrecs 8159 df-recs 8233 df-rdg 8272 df-er 8529 df-en 8765 df-dom 8766 df-sdom 8767 df-pnf 11057 df-mnf 11058 df-xr 11059 df-ltxr 11060 df-le 11061 df-sub 11253 df-neg 11254 df-nn 12020 df-2 12082 df-sets 16910 df-slot 16928 df-ndx 16940 df-base 16958 df-plusg 17020 df-0g 17197 df-mgm 18371 df-sgrp 18420 df-mnd 18431 df-mgp 19766 df-ur 19783 df-ring 19830

This theorem is referenced by: (None)

W3C validator