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Laws of set algebra help

  1. Dec 10, 2007 #1
    could anyone help me with this equation?

    [(a' u b') n a'] = a

    ive tried the following

    [(a n b)' n a'] usng demorgans
    [(a' n a') n b] using associative

    then stuck and

    [(a' n b') u (a' n a')] using distributive
    [(a' n b') u a'] using indempotent

    then stuck

    thanks for any help
  2. jcsd
  3. Dec 10, 2007 #2


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    Staff Emeritus
    Science Advisor

    What exactly does a' mean? I first assumed you meant the complement of a but then [(a' u b') n a'] = a can't be true.
  4. Dec 13, 2007 #3
    [(a' u b') n a'] can't equal a. Doesn't it equal a'?
  5. Dec 16, 2007 #4
    teacher just let us know that there was a complement sign missing from the paper that was ment to be on the outside of the square brackets - i got it done ok now its possible
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