User:I know about set theory
 | This account is a sockpuppet of Ln of x (talk · contribs · logs), and has been blocked indefinitely. Please refer to the sockpuppet investigation of the sockpuppeteer, and editing habits or contributions of the sockpuppet for evidence. This policy subsection may be helpful. Account information: block log – contribs – logs – abuse log – CentralAuth |  |