3 Oct
2005
3 Oct
'05
4:58 p.m.
Suppose we have m numbers a_1 <= a_2 <= ... <= a_m, and n numbers b_1 <= b2 <= ... <= b_n. How many different ways can the a_i and b_i be related with < and = ? For example, if m = 2 and n = 2, two possible arrangements are a1 < a2 = b1 < b2 (considered equivalent to a1 < b1 = a2 < b2) b1 < a1 = a2 = b2 -------------------------------- - David Wilson