Recurrent Theme of Pick's Theorem
We review and possibly add some new variant to the existing derivations of the formula for the area of Jordan lattice polygons drawn on two-dimensional lattices. The formula is known as Pick's theorem and is related to the number theory elementary result-Bezout lemma. It is pointed out that Euclidean algorithm can be easily used in construction of infinite number of distinct primitive cells for any two-dimensional lattice. Pick's formula itself can also be obtained in an elementary "cut and re-assemble" finite process.
math.HO↗