Discussion Assignment

Let D be the set of all calendar dates from 4/30/1789 to 9/25/2014.

Let P be the set of names of U.S. presidents.

Let F be the set of names of first ladies of the U.S.

Consider the following two functions pres : D to P where pres (d) is the name of the president of the U.S. on date d (the incumbent on inauguration days, to avoid ambiguity) and lady : P to F where lady (p) is the name of the first lady of the U.S. during the presidency of president P.