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Thread: Mathmation required!

  1. #1
    Registered User Katie Kicks Ass's Avatar
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    Unhappy Mathmation required!

    Ok I have got stressed out about this for too long now, does anybody know how to do complex truth tables and simplify Booloean Expressions?

    I need some one to simplfy:
    _ _ _

    A.B+A.B+A.B

    With truth table of simplfied equation.

    And this truth table completing.
    Attached Files Attached Files

  2. #2
    Registered User FirstMove's Avatar
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    Re: Mathmation required!

    Excel can do all the work for you! It has AND and OR functions for prescisely this job.

    e.g. =+AND(1,1)=1

    I think if you simplify symbolically you just get A.B, but I suggest you check.

    What is the Z column for in you spreadsheet? It looks like NOT ( A . B)
    Last edited by FirstMove; 17th-June-2007 at 06:14 PM.

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    Registered User David Franklin's Avatar
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    Re: Mathmation required!

    Quote Originally Posted by Katie Kicks Ass View Post
    Ok I have got stressed out about this for too long now, does anybody know how to do complex truth tables and simplify Booloean Expressions?

    I need some one to simplfy:
    _ _ _

    A.B+A.B+A.B
    As it stands, I can't work out what you're asking here (I'm assuming the _ are supposed to be overbars denoting complement, but the alignment has gone hopelessly wrong). Do you want to try again? I suggest you use ' to denote complement (e.g. A'.B = (NOT A) AND B) as you will have far fewer problems with the vBulletin software mucking up the formatting.

    As far as the spreadsheet goes - what is the problem you are having? Can you really not work out what "not B" is given B?

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    Registered User Katie Kicks Ass's Avatar
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    Re: Mathmation required!

    No i can't i could do with someone just telling me the answer i've stressed too long over it and i cant understand it for toffee.

    BTW its (NOT A).(NOT B)+A.(NOT B)+A.B

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    Registered User David Franklin's Avatar
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    Re: Mathmation required!

    Quote Originally Posted by Katie Kicks Ass View Post
    No i can't i could do with someone just telling me the answer i've stressed too long over it and i cant understand it for toffee.

    BTW its (NOT A).(NOT B)+A.(NOT B)+A.B
    (NOT A).(NOT B)+A.(NOT B)+A.B = NOT ((NOT A).B)

    For the spreadsheet, If B = 0, then NOT B = 1. If B=1 then NOT B = 0.

    Once you've filled in the "NOT B" column, then A. (NOT B) = 1 if "A = 1 and (NOT B) = 1", otherwise it = 0.

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    Registered User FirstMove's Avatar
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    Re: Mathmation required!

    <snip>
    Last edited by FirstMove; 17th-June-2007 at 07:43 PM. Reason: Better answer from DF, no need to confuse matters further

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    Re: Mathmation required!

    Quote Originally Posted by David Franklin View Post
    (NOT A).(NOT B)+A.(NOT B)+A.B = NOT ((NOT A).B)

    For the spreadsheet, If B = 0, then NOT B = 1. If B=1 then NOT B = 0.

    Once you've filled in the "NOT B" column, then A. (NOT B) = 1 if "A = 1 and (NOT B) = 1", otherwise it = 0.
    My boolean logic is very rusty. I seek enlightenment.

    I thought the + sign meant OR and the . meant AND

    I simplified (NOT A).(NOT B)+A.(NOT B)
    to (NOT A OR A).(NOT B)
    then to (NOT B)

    Then I simplified (NOT B) OR A.B
    to (NOT B) OR A

    Do I remember wrong?

  8. #8
    Registered User David Franklin's Avatar
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    Re: Mathmation required!

    Quote Originally Posted by bigdjiver View Post
    My boolean logic is very rusty. I seek enlightenment.

    I thought the + sign meant OR and the . meant AND

    I simplified (NOT A).(NOT B)+A.(NOT B)
    to (NOT A OR A).(NOT B)
    then to (NOT B)

    Then I simplified (NOT B) OR A.B
    to (NOT B) OR A
    They're both correct, yours is probably a bit simpler to be honest. (I just went for the "the only way this can be false is if A=0 and B=1" approach).

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    Re: Mathmation required!

    Quote Originally Posted by David Franklin View Post
    They're both correct, yours is probably a bit simpler to be honest. (I just went for the "the only way this can be false is if A=0 and B=1" approach).
    Thanks.

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    Registered User Beowulf's Avatar
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    Re: Mathmation required!

    I'm just back from London and my brain is fried.

    I got as far as realising that (2B)+(NOT 2B) was not the question

    bigdjiver and David Franklin got it right before me though.. so to them

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