This section gives a review of the  basic elements of multivariate calculus, required for the EdX course “Observation Theory: Estimating the unknown”.

In the following units, you will find information about three main topics, which you should be familiar with before the start of Module 3 on Least Squares estimation:

1. Multivariate functions and partial derivatives
2. Gradient
3. Jacobian matrix
4. Taylor approximation (only needed for the optional part on non-linear least squares in module 4)