A reduced affine variety is an algebraic set that does not contain any nilpotent elements in its coordinate ring, which means it has no repeated roots in its defining polynomials. This property ensures that the structure of the variety is as 'simple' as possible, allowing for clearer geometric interpretations and the application of various algebraic techniques. Reduced affine varieties are fundamental in the study of algebraic geometry as they represent the most basic form of geometric objects, where each point corresponds uniquely to a maximal ideal in the coordinate ring.
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