# Notation difference

Discussion in 'Homework Help' started by eastmus, Dec 28, 2008.

1. ### eastmus Thread Starter New Member

Dec 28, 2008
9
0
could someone explain me how "NOT" works with A'B' etc...

im only familiar with the lines on top of the letter like

and how would u write the above boolean algebra in AB'CD' with those ' (quotes)

thx!

Apr 20, 2004
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3. ### eastmus Thread Starter New Member

Dec 28, 2008
9
0
Thanks and I appologize for asking in the older topic.

I'm trying to learn from someone else's post about mux but I dont understand his boolean algebra.

4. ### silvrstring Active Member

Mar 27, 2008
159
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The example you posted above might be typed here as X = ((A+B')+C'D)'

The apostrophes are bars.

5. ### eastmus Thread Starter New Member

Dec 28, 2008
9
0
mmh then there is still a small confusion to me.

will this mean its one long bar over C and D or a small bar on C and a small one on D.
The difference is that Demorgan can be applied.
Where a long bar over C and D will simplify it to C'+D'

Thanks

6. ### silvrstring Active Member

Mar 27, 2008
159
0
Okay. Using DeMorgan's theorem, we can type it as

C'D' = (C + D)'