Boolean Algebra (negation quickie)

[sunrah]

is this a valid statement

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

 

[darkxponent]

Doesn't look valid. Verify using Truth Table.

 

[barryj]

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

Don't remember the name however.

 

[haruspex]

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

Don't remember the name however.

http://en.wikipedia.org/wiki/De_Morgan's_laws

 

[collinsmark]

Don't remember the name however.

DeMorgan's Theorem.

http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/demorgan.html