Algebraic geometry teaches us that associated to each commutative ring with unit A is a space, Spec A. Given any A-module M and any element m of M we can associate a subspace of Spec A called the support of m. In other words, it makes sense to ask where module elements live.
We will start with a description of Spec A and its closed subschemes, then define support. Time permitting, we will consider examples from polynomials, linear homogeneous differential equations, and linear homogeneous recurrence relations.