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Homework Help: Digital logic equation problem

  1. Nov 21, 2011 #1
    I'm new to this forum.
    My problem led me here.

    1. The problem statement, all variables and given/known data
    I need to solve this, using simplifying rules.
    ∫ = Ʃ(0,5,6,7,13)

    But I always get one extra area when checking with Karnaugh map, which isn't necessary.

    2. Relevant equations
    ∫() = a' b' c' d' + a' b c' d + a' b c d' + a' b c d + a b c' d

    3. The attempt at a solution
    Well I get always this as a solution, no matter the order i simplify

    ∫() = a' b' c' d' + b c' d + a' b c + a' b d

    Now when applied to Karnaugh map the areas (equation parts from left to right 1-4) 1, 2, 3 are the solution I get when only using the map. But 4 overlaps with 2 and 3.

    http://s8.postimage.org/dbo6zqrab/img.jpg [Broken]

    If anyone has time to help me out, then please do.

    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Nov 22, 2011 #2


    User Avatar

    Staff: Mentor

    Can you explain what this means, and how you went about solving it? I might catch on to what you are doing.
  4. Nov 23, 2011 #3
    The k-map produces the right result: The simplified equation is:

    a' b c +b c' d + a' b' c' d'

    There is more you can do with your equation

    a' b' c' d' + b c' d + a' b c + a' b d

    Hint: Consensus Theorem :)
  5. Nov 23, 2011 #4
    Thank you Ivan92 your advice helped me solve this.

    Now as I'm here does anyone know any free or opensource software for modelling this function visually?
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