For one who ties knots a knot is a piece of rope, string, nylon or such like that
is to be manipulated into a certain shape according to usefulness or aesthetics.
For the mathematician it is an infinitely think, smoothly deformable closed curve
in three dimensional space. I will explain knots both from a theoretical and practical
point of view including the odd anecdote about how both aspects influence my professional
and recreational life.
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