AbsorbtionLaw

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From http://mathworld.wolfram.com/AbsorptionLaw.html\bigskip

The absorbtion law states: 
\[
   a \wedge ( a \vee b ) = a \vee (a \wedge b) = a
\]

for binary operators $\vee$ and $\wedge$ (most commonly as logical OR / AND).\bigskip

In this sense, $a$ absorbs $b$.