Theorem ollat

Description: An ortholattice is a lattice. (Contributed by NM, 18-Sep-2011)

	Ref	Expression
Assertion	ollat	|- ( K e. OL -> K e. Lat )

Proof

Step	Hyp	Ref	Expression
1		isolat	|- ( K e. OL <-> ( K e. Lat /\ K e. OP ) )
2	1	simplbi	|- ( K e. OL -> K e. Lat )