Definition df-simpg 20039

Description: Define class of all simple groups. A simple group is a group (df-grp 18884) with exactly two normal subgroups. These are always the subgroup of all elements and the subgroup containing only the identity (simpgnsgbid 20051). (Contributed by Rohan Ridenour, 3-Aug-2023.)

Assertion

Ref	Expression
df-simpg	⊢ SimpGrp = {𝑔 ∈ Grp ∣ (NrmSGrp‘𝑔) ≈ 2o}

Detailed syntax breakdown of Definition df-simpg

Step	Hyp	Ref	Expression
1		csimpg 20038	. 2 class SimpGrp
2		vg	. . . . . 6 setvar 𝑔
3	2	cv 1533	. . . . 5 class 𝑔
4		cnsg 19067	. . . . 5 class NrmSGrp
5	3, 4	cfv 6542	. . . 4 class (NrmSGrp‘𝑔)
6		c2o 8474	. . . 4 class 2o
7		cen 8952	. . . 4 class ≈
8	5, 6, 7	wbr 5142	. . 3 wff (NrmSGrp‘𝑔) ≈ 2o
9		cgrp 18881	. . 3 class Grp
10	8, 2, 9	crab 3427	. 2 class {𝑔 ∈ Grp ∣ (NrmSGrp‘𝑔) ≈ 2o}
11	1, 10	wceq 1534	1 wff SimpGrp = {𝑔 ∈ Grp ∣ (NrmSGrp‘𝑔) ≈ 2o}

This definition is referenced by:  issimpg  20040