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.
40lbs for softwood cofi rated plywood and there is 60 sheets = 2,460 lbs. now using 3/4 as our example, we know that it is approx. 60lbs for softwood cofi rated plywood and there is 40 sheets = 2,400 lbs. So for all intents and purposes, they are approx the same weight lifts regardless of thickness. It varies when you start talking about other types of wood on the plywoods but they are all listed, graded and rated on the same scale.