Help for Discrete Structures and Logic,

Assume that xyP(x,y) is true and that the domain of discourse is nonempty. Describe each of the following three statements, determine which of these statements must also be true. If the statement is true, explain; otherwise give a counter example.

1. xyP(x,y)

2. xyP(x,y)

3. xyP(x,y)