I saw her/him on
the way to class and stopped for a quandle.
an object in
mathematics defined as a set, Q, along with a binary
operation, *, so that for all a, b, and c in Q,
the following hold:
I. a*a = a
II. There is a unique x in q so that x*a = b
III. (a*b)*c = (a*c)*(b*c)
If Q is the integers and a*b = 2b-a, then (Q,*) is a quandle.