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.
Oriented strand board, or OSB, is a wood structural panel that can also be used for flooring. It is made from shredded strands of wood pressed together with wax and a special adhesive, then hot pressed into a panel with up to 50 layers of strands. OSB can be used for subfloors, although it is not as common as CDX.For 19/32-inch-thick panels, the joists should be 20 inches on center. For 23/32-inch-thick panels, the joists should be at least 24 inches on center.SB can be used for subfloors, although it is not as common as CDX. For 19/32-inch-thick panels, the joists should be 20 inches on center. For 23/32-inch-thick panels, the joists should be at least 24 inches on center.