# Boolean Algebra (negation quickie)

is this a valid statement

$\overline{A\overline{B}} = \overline{A}B$

## Answers and Replies

Related Introductory Physics Homework Help News on Phys.org
Doesn't look valid. Verify using Truth Table.

I seem to recall a rule something like not(AB) = A' + B' and not(A+B) = A'B'

Don't remember the name however.