(X+Y)'.Z+W'.Y logic circuit diagram
Answers
Theorems and Properties of Boolean Algebra:
Theorem 1:
a. x + x = x
proof:
x + x = ( x + x ) . 1 by postulate (2b)
= ( x + x ) (x + x')
= (x + xx')
= x + 0
= x
b. x . x = x
proof:
x . x = x. x + 0
= x . x + x . x'
= x (x + x')
= x . 1
= x
Theorem 2:
a. x + 1 = 1
proof:
x + 1 = 1 . ( x + 1)
= ( x + x' )( x + 1)
= x + x' . 1
= x + x'
= 1
b. x.0 = 0 by duality
Theorem 3:
(x')' = x
Theorem 4:
a. x + ( y + z ) = ( x + y ) + z associative
b. x ( yz ) = ( xy ) z associative
Theorem 5
a. x + xy = x
proof:
x + xy = x.1 + xy by postulate 2 (b)
= x (1 + y) by postulate 4 (a)
= x ( y + 1 ) by postulate 3 (a)
= x . 1 by theorem 2 (a)
= x by postulate 2(b)
Operator precedence for evaluating the boolean expression is:
1. First the expressions inside parentheses must be evaluated.
2. Complement ( NOT )
3. AND
4. OR
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