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#<math> r \cdot ( x + y ) = r \cdot x + r \cdot y </math>,
#<math> ( r + s ) \cdot x = r \cdot x + s \cdot x </math>,
#<math> ( r \cdot s ) \cdot x = r \cdot ( s \cdot x ) </math>,
#<math> 1 \cdot x = x .</math>
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