Let R be equipped with the Euclidear topology T and let Y =]10,20[. We denote by Ty the induced topology on Y by T. Then [15,20[ is closed in (Y,Ty) and not closed in R closed in (Y,Ty) and closed in R not closed in (Y,Ty) and closed in R neither closed in (Y,Ty) nor in R O O O

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.