Click anywhere to choose a center z₀. The function f(z) = 1/((z−1)(z−2)) has three series about z₀, valid on three regions set by the two poles (×): a Taylor disc, a Laurent annulus, and a Laurent exterior.
A modern JavaScript + Canvas port of a Java applet by Terence Tao (~2007,
originally LaurentApp.java / LaurentGrid.java).