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Interactive Introduction to Knot Theory, Paperback by Johnson, Inga; Henrich, Allison, ISBN 0486804631, ISBN-13 9780486804637, Like New Used, Free shipping in the US Well-written and engaging, this hands-on approach features many exercises to be completed by readers. Topics include knot definition and equivalence, combinatorial and algebraic invariants, unknotting operations, and virtual knots. 2016 edition.
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