DeMorgan's law

Discussion in 'Homework Help' started by SAYED, Mar 29, 2007.

  1. SAYED

    Thread Starter Member

    Mar 29, 2007
    14
    0
    hallo
    plesae help me

    apple DeMorgan's law to find the complement of the folloing expession
    [​IMG]
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    Two points:

    1. Aquaint yourself with DeMorgan's Theorums.

    2. Remember that you can apply the double-NOT function such that it will not change the expression, i.e. A => NOT gives A' => NOT gives A (where ' = NOT). This is very useful when applying DeMorgan's Theorums.

    Have a go, post up your attempts and we can help you from there.

    Dave
     
  3. SAYED

    Thread Starter Member

    Mar 29, 2007
    14
    0
    help me I'm don't understant this subject

    thank you
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Did you read the information in the link? If you can cite the specific parts you are having trouble with, we can walk you through them.
     
  5. SAYED

    Thread Starter Member

    Mar 29, 2007
    14
    0
    is the ruslt right or no
    [​IMG]
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Almost... you dropped an "A"

    Needs to be A(B'+C') instead of simply B'+C'

    Otherwise, you got it right!
     
  7. emad

    New Member

    Mar 26, 2007
    6
    0
    DEAR
    you can use simple one law

    ( A . B )' = A' + B'


    A( B. C' +(D.E)' )+ (B.F)' =

    A( B. C' + D' + E' ) + B' + F' =

    A . B . C' + A .D' + A .E' + B' + F'
     
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