Definition df-mgp 18877

Description: Define a structure that puts the multiplication operation of a ring in the addition slot. Note that this will not actually be a group for the average ring, or even for a field, but it will be a monoid, and unitgrp 19054 shows that we get a group if we restrict to the elements that have inverses. This allows us to formalize such notions as "the multiplication operation of a ring is a monoid" (ringmgp 18940) or "the multiplicative identity" in terms of the identity of a monoid (df-1r 10218). (Contributed by Mario Carneiro, 21-Dec-2014.)

Assertion

Ref	Expression
df-mgp	⊢ mulGrp = (𝑤 ∈ V ↦ (𝑤 sSet ⟨(+g‘ndx), (.r‘𝑤)⟩))

Detailed syntax breakdown of Definition df-mgp

Step	Hyp	Ref	Expression
1		cmgp 18876	. 2 class mulGrp
2		vw	. . 3 setvar 𝑤
3		cvv 3398	. . 3 class V
4	2	cv 1600	. . . 4 class 𝑤
5		cnx 16252	. . . . . 6 class ndx
6		cplusg 16338	. . . . . 6 class +g
7	5, 6	cfv 6135	. . . . 5 class (+g‘ndx)
8		cmulr 16339	. . . . . 6 class .r
9	4, 8	cfv 6135	. . . . 5 class (.r‘𝑤)
10	7, 9	cop 4404	. . . 4 class ⟨(+g‘ndx), (.r‘𝑤)⟩
11		csts 16253	. . . 4 class sSet
12	4, 10, 11	co 6922	. . 3 class (𝑤 sSet ⟨(+g‘ndx), (.r‘𝑤)⟩)
13	2, 3, 12	cmpt 4965	. 2 class (𝑤 ∈ V ↦ (𝑤 sSet ⟨(+g‘ndx), (.r‘𝑤)⟩))
14	1, 13	wceq 1601	1 wff mulGrp = (𝑤 ∈ V ↦ (𝑤 sSet ⟨(+g‘ndx), (.r‘𝑤)⟩))

This definition is referenced by:  fnmgp  18878  mgpval  18879