Question: 4. on the set (a,b)R(c,d) necessary and sufficient condition for |a|+|b|=|c|+|d| defined as R relation is given. R Does the relation have the properties

4. on the set "(a,b)R(c,d) necessary and sufficient condition for |a|+|b|=|c|+|d| defined as R relation is given. R Does the relation have the properties of reflection, symmetry, inverse symmetry, and transition? Please search.

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