I am given the following boolean expression, and was told to simplify it using De Morgan's Law.
$$(w + x' + y +z')(w' + x + y + z')(w' + x' + y' + z')$$
I approached this through the commonly used method of finding the dual, and then taking the complement of each literal afterwards.
$$wx'yz' + w'xyz' + w'x'y'z'$$
That's the dual of the function
$$w'xy'z + wx'y'z + wxyz$$
That's when I take the compliment of each literal.
I find it a little hard to believe this is correct, and that this is a correct application of De Morgan's Law. If anyone could verify or guide me if it's incorrect I'd greatly appreciate it.