Reductions
	• Informally, we say problem A reduces to problem B (A £ B) if an instance of A can be solved by – Calling a subroutine that can solve B – Doing a small amount of additional work before and/or after calling B				SolveA(InstanceOfA):    Use InstanceOfA to build an    InstanceOfB;    s = SolveB(InstanceOfB);    Use s to build solution for    InstanceOfA;    return solution; end.
			CS409 - Spring 2000					1