afyl128 received 4 Kudos for post K is a set of numbers such that (i) If x is in K, then -x.

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healthjunkieK is a set of numbers such that (i) If x is in K, then -x01-Mar-2015
tomonakK is a set of numbers such that (i) If x is in K, then -x09-Oct-2014
abhishekailK is a set of numbers such that (i) If x is in K, then -x02-Oct-2014
gmaaaatvanessaK is a set of numbers such that (i) If x is in K, then -x23-Sep-2014

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