Here are links to articles in my “What Is” series (for which a full index is available). The articles are *not written for this course and contain material that is not in the syllabus*. However, you may find them useful as further reading.

The articles are also available in PDF form at this GitHub repository,

## Basics

- What Is a Matrix?
- What Is a Symmetric Positive Definite Matrix?
- What Is an Orthogonal Matrix?
- What is the Cayley–Hamilton Theorem?
- What Is the Determinant of a Matrix?
- What Is Floating-Point Arithmetic?
- What Is IEEE Standard Arithmetic?
- What Is Rounding?
- What Is a Block Matrix?
- hat Is the Sherman–Morrison–Woodbury Formula?
- What Is a Vector Norm?
- What Is a Matrix Norm?
- What Is a Unitarily Invariant Norm?
- What Is a Condition Number?
- What is Numerical Stability?
- Matrix Rank Relations