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.
How heavy the plywood is. The weight of a plywood sheet will proportionally increase with increasing in width, length and thickness. 3/4 thick plywood will weigh about 2.5 pounds per square foot (PSF). And the whole 4â x 8â sheet will be approximately 84 lb. or 38 kilograms.