notes on introductory point set topology allen hatcher chapter 1 basic point set topology 1 topological spaces 1 interior closure and boundary 5 basis for a topology 7 metric spaces ...
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...Notes on introductory point set topology allen hatcher chapter basic topological spaces interior closure and boundary basis for a metric subspaces continuity homeomorphisms product exercises connectedness path connectedspaces cutpoints connectedcomponentsandpathcom ponents the cantor compactness compact sets in euclidean space hausdor normal lebesgue numbers innite products quotient thequotient surfaces onewaytodescribethe subject of is to say that it qualitative geom etry idea if one geometric object can be continuously transformed into another then two objects are viewed as being topologically same example circle square equivalent physically rubber band stretched form either or well many other shapes which also hand gureeight curveformedbytwocirclestouching ata pointis regarded topo logically distinct from property distinguishes gure eight number connected pieces remain when single removed what remains still arc whereas removes contact its circles separate arcs thetermusedtodescribet...