A q×q Latin square is an arrangement of q symbols, each repeated q times, in a square of side q such that each symbol appears exactly once in each row and in each column. Such arrangements are useful ...

In the spring of 1985, Jack Smith wrote a column for this newspaper with the following headline: “Can Downtown L.A. Survive Its Own Heady Prosperity?” Smith spent the column puzzling over what do with ...

All of the preceding examples involve designs with completely nested block structures, for which PROC PLAN was especially designed. However, by appropriate coordination of its facilities, a much wider ...