# Karnaugh Mapping error

#### MWalden

Joined Apr 26, 2007
24
On the Karnaugh mapping chapter in the section larger 4 variable Karnaugh maps I believe there is an error. About halfway down the page it says it maps this equation on a Karnaugh map:

A'B'C'D'+A'B'CD'+AB'C'D'+ABCD

which the map is right. But the simplified boolean expression is:

B'C'D'+A'B'D+ABCD

Isn't the D in the second product group suppose to be D's compliment D'?
If not what am I missing?

#### Dave

Joined Nov 17, 2003
6,970
Indeed it looks as though you have found an error. The error has also propagated onto the subsequent paragraph. Thanks for pointing it out.

Dave

#### Dcrunkilton

Joined Jul 31, 2004
422
Thanks for the correction MWalden. The corrections have been made to the copy at ibiblio.org