Flapan, Erica Knots, Molecules, and the universe : an introduction to topology / by Erica Flapan. - Rhode Island : American Mathematical Society, 2015. - xvii, 386 p. : illu. : 25 cm. ISBN: 9781470437350 (PB) Subjects--Topical Terms: Mathematics. Dewey Class. No.: 514 / FLA/K