Definition df-p1

Description: Define poset unit. (Contributed by NM, 22-Oct-2011)

	Ref	Expression
Assertion	df-p1	|- 1. = ( p e. _V |-> ( ( lub ` p ) ` ( Base ` p ) ) )

Detailed syntax breakdown

Step	Hyp	Ref	Expression
0		cp1	|- 1.
1		vp	|- p
2		cvv	|- _V
3		club	|- lub
4	1	cv	|- p
5	4 3	cfv	|- ( lub ` p )
6		cbs	|- Base
7	4 6	cfv	|- ( Base ` p )
8	7 5	cfv	|- ( ( lub ` p ) ` ( Base ` p ) )
9	1 2 8	cmpt	|- ( p e. _V |-> ( ( lub ` p ) ` ( Base ` p ) ) )
10	0 9	wceq	|- 1. = ( p e. _V |-> ( ( lub ` p ) ` ( Base ` p ) ) )