 Dual module

For an $R$-module $M$, its dual module is $M^{\ast }={\mathrm{Hom}}_R(M,R)$, with pointwise addition and scalar multiplication.

The term "dual module" can have different meanings depending on the context in which it is used, particularly in fields like electronics, education, and software. Here are a few interpretations: 1. **Electronics**: In the context of electronics, a dual module may refer to a component that contains two functional units in a single package.