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.
In favor of OSB: 1  OSB can be manufactured into panels that are larger than plywood. 2  OSB is more uniform, so there are fewer soft spots, such as those that can occur in plywood. 3  OSB is less expensive than plywood. 4  To build a typical 2,400-square foot home, OSB may cost $700 less than plywood.