A '''set''' is a property of [[numbers]] which can be thought of as an object but without altering their properties. However Russell's [[paradox]] states that there are no "normal" sets, insofar as they would not be contained in itself, leading to a contradiction. | A '''set''' is a property of [[numbers]] which can be thought of as an object but without altering their properties. However Russell's [[paradox]] states that there are no "normal" sets, insofar as they would not be contained in itself, leading to a contradiction. |