Question on deMorgans law on simplifying boolean expressions

[randomperson4]

Homework Statement

I'm sure you all know deMorgans law on simplifying boolean expressions, I just can't seem to get it. It doesn't make sense to me, like ([not]x.[not]y) = [not]x + [not]y].


2. The attempt at a solution

I tried it and I don't know why it doesn't work for me ie.
([not]1.[not]0) = [not]1 + [not]0 =
(0.1) = 0 + 1 =
0 = 1

See my problem.

 

[Dick]

DeMorgan's says not[x].not[y]=not[x+y]. That's NOT the same as not[x]+not[y].

 

[randomperson4]

Woah, Thanks.