pwsgrp

Description: A structure power of a group is a group. (Contributed by Mario Carneiro, 11-Jan-2015)

		Ref	Expression
	Hypothesis	pwsgrp.y	$⊢ Y = R ↑_{𝑠} I$
	Assertion	pwsgrp	$⊢ (R \in Grp \land I \in V) \to Y \in Grp$

Step	Hyp	Ref	Expression
1		pwsgrp.y	$⊢ Y = R ↑_{𝑠} I$
2		eqid	$⊢ Scalar (R) = Scalar (R)$
3	1 2	pwsval	$⊢ (R \in Grp \land I \in V) \to Y = Scalar (R) ⨉_{𝑠} (I \times \{R\})$
4		eqid	$⊢ Scalar (R) ⨉_{𝑠} (I \times \{R\}) = Scalar (R) ⨉_{𝑠} (I \times \{R\})$
5		simpr	$⊢ (R \in Grp \land I \in V) \to I \in V$
6		fvexd	$⊢ (R \in Grp \land I \in V) \to Scalar (R) \in V$
7		fconst6g	$⊢ R \in Grp \to (I \times \{R\}) : I ⟶ Grp$
8	7	adantr	$⊢ (R \in Grp \land I \in V) \to (I \times \{R\}) : I ⟶ Grp$
9	4 5 6 8	prdsgrpd	$⊢ (R \in Grp \land I \in V) \to Scalar (R) ⨉_{𝑠} (I \times \{R\}) \in Grp$
10	3 9	eqeltrd	$⊢ (R \in Grp \land I \in V) \to Y \in Grp$

Metamath Proof Explorer