Question: How do I challenge a solution? Thumbs down did not take me to any input box. Re posted solution for Pinter, A Book of Abstract

How do I challenge a solution? Thumbs down did not take me to any input box. Re posted solution for Pinter, A Book of Abstract Algebra. Ch 2, Pr.1EA, isn't the rule also not an operation because it does not produce unique result; i.e., for 2*8, the function returns both +4 and -4?

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