space , Distjoint-set DS . Th, Sep 24 Curves and Knots. [EH09] Section I.2+3 On Wikipedia: Jordan Curve Theorem , Knot Theory , Links , Complexity . Tu, Sep 29 Surfaces. [EH09] Section II.1 . See [M00] Sections 74,76,77 for rigorous treatment of polygonal schema, cutting pasting, and surface classification. On