anonymous
  • anonymous
Boolean algebra Show that F(x, y, z) = xy + xz + yz has the value 1 if and only if at least two of the variables x, y, and z have the value 1. How can I show that apart from drawing the truth table??
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
since this is completely symmetric in \(x, y, z\) you can work by cases
anonymous
  • anonymous
by which i mean without loss of generality you can say \(x=1,y=1, z=1\) and get it, or \(x=1,y=1,z=0\) and also get it
anonymous
  • anonymous
then for the "if" part, take \(x=1,y=0,z=0\) and show it is not true and also in the case \(x=y=z=0\)

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anonymous
  • anonymous
But then, it would be similar to drawing the truth table...
anonymous
  • anonymous
i have attached a file of the truth table but it is not uploading for a reason probably due to a file format, however, all the cases are valid apart from 0 or 0 or 0 of your and statments
1 Attachment
anonymous
  • anonymous
0 represents F, and 1 represents T
hartnn
  • hartnn
here's what we can do without using truth table. Double complement F , F = (xy+yz+xz) '' =[ (xy+yz+xz)']' now use De-morgan's law on (xy+yz+xz) ' what you get ?
hartnn
  • hartnn
where a' means complement of a
anonymous
  • anonymous
(xy + yz +xz)'' = [(xy + yz +xz)']' = [(xy)' (yz)' (xz)']' = [(x'+y') (z'+y') (x'+z') ]' = [ (x'z' + y'z' + x'y' + y') ( x'+z') ]' = [ x'z' + x'y'z' + x'y' + y'z' ]' = [x'z' + x'y' (z'+1) + y'z' ]' = (x'y' + x'z' + y'z')'
hartnn
  • hartnn
yes, with (x'y' + x'z' + y'z')' you can conclude that F has the value 1 if and only if at least two of the variables x, y, and z have the value 1.
hartnn
  • hartnn
because if say you have only x=1 then (x'y' + x'z' + y'z')' = (0+0+1)' = 0
hartnn
  • hartnn
so, atleast 2 variables have to be 1 to get (x'y' + x'z' + y'z')' =1
anonymous
  • anonymous
(Testing) x=1, y=1 (x'y' + x'z' + y'z')' = (0 + 0 + 0)' = 1 x=1, z=1 (x'y' + x'z' + y'z')' = (0 + 0 +0)' = 1 y=1, z=1 (x'y' + x'z' + y'z')' = (0 + 0 + 0)' = 1 x=y=z=1 (x'y' + x'z' + y'z')' = (0 + 0+ 0)' =1 Wow!! Thanks!!!
hartnn
  • hartnn
welcome ^_^

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