Math — Boolean Algebra
The laws of Boolean logic.
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A + 0 = A,\quad A \cdot 1 = A
A + \bar{A} = 1,\quad A \cdot \bar{A} = 0
\overline{A + B} = \bar{A}\cdot\bar{B}\quad(\text{De Morgan})
A + AB = A\quad(\text{absorption})