Electric currents in infinite networks

In this survey, we will present the basic facts about conduction in infinite networks. This survey is based on the work of Flanders [5, 6], Zemanian [17], and Thomassen [14], who developed the theory of infinite networks from scratch. Here we will show how to get a more complete theory by paralleling the well-developed theory of conduction on open Riemann surfaces. Like Flanders and Thomassen, we will take as a test case for the theory the problem of determining the resistance across an edge of a d-dimensional grid of 1 ohm resistors. (See Figure 1.) We will use our borrowed network theory to unify, clarify and extend their work.