A sparse ruler is called optimal if it is both minimal and maximal. Since the number of distinct pairs of marks is m ( m â 1 ) / 2 {\displaystyle m(m-1)/2} , this is an upper bound on the length L {\displaystyle L} of any maximal sparse ruler with m {\displaystyle m} marks.
1 One 23/32-inch 4x8-foot plywood piece weighs approximately 67 pounds, while a piece of OSB of the same dimensions weighs approximately 78 pounds.
A viable alternative to plywood, this OSB Board is engineered to prevent any cupping, warping or splitting. The most common uses are for sheathing in walls, flooring, and roof decking. Engineered for load-bearing applications. No core voids, preventing cupping, warping or splitting.