Notation difference

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

  1. eastmus

    Thread Starter New Member

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

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

    [​IMG]

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


    thx!
     
  2. beenthere

    Retired Moderator

    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
    0
    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.

    If the expression reads C'D'

    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)'

    and your last sentence would read (CD)' = C'+D'

    Happy New Year, and take care!
     
  7. eastmus

    Thread Starter New Member

    Dec 28, 2008
    9
    0
    ty happy new year

    i understand it now
     
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