Theorem tchplusg

Description: The addition operation of a subcomplex pre-Hilbert space augmented with norm. (Contributed by Mario Carneiro, 8-Oct-2015)

	Ref	Expression
Hypotheses	tcphval.n	|- G = ( toCPreHil ` W )
	tchplusg.v	|- .+ = ( +g ` W )
Assertion	tchplusg	|- .+ = ( +g ` G )

Proof

Step	Hyp	Ref	Expression
1		tcphval.n	|- G = ( toCPreHil ` W )
2		tchplusg.v	|- .+ = ( +g ` W )
3		eqid	|- ( Base ` W ) = ( Base ` W )
4	3	tcphex	|- ( x e. ( Base ` W ) |-> ( sqrt ` ( x ( .i ` W ) x ) ) ) e. _V
5		eqid	|- ( .i ` W ) = ( .i ` W )
6	1 3 5	tcphval	|- G = ( W toNrmGrp ( x e. ( Base ` W ) |-> ( sqrt ` ( x ( .i ` W ) x ) ) ) )
7	6 2	tngplusg	|- ( ( x e. ( Base ` W ) |-> ( sqrt ` ( x ( .i ` W ) x ) ) ) e. _V -> .+ = ( +g ` G ) )
8	4 7	ax-mp	|- .+ = ( +g ` G )