I came across a question regarding logic gates and I can't understand how to solve it.
Q) Construct the truth table and write the boolean output equation.
i) Realize using NOR gates only: $$f(A,B,C,D) = \prod (0, 1, 2, 7, 8, 9, 10) + \Phi(12, 13)$$
I tried to get Boolean equation using KMAP method and I got this Boolean equation $$(B + D).(B+C)$$ Is this correct? If not how to approach this problem? What does phi of 12, 13 mean here? Are they don't care values?
Any help is appreciated.