Determinant det([𝑎𝑐𝑏𝑑])=𝑎𝑑−𝑐𝑏 det([𝑎𝑑𝑔𝑏𝑒ℎ𝑐𝑓𝑖])=𝑎(𝑒𝑖−𝑓ℎ)−𝑏(𝑑𝑖−𝑓𝑔)+𝑐(𝑑ℎ−𝑒𝑔) Eigenvalues Notation: 𝜆 solve det(𝐴−𝜆𝐼)=0 Singular value Notation: 𝛿 𝛿2=𝜆 Inverse of martixs (𝐴𝐵)𝑇=𝐵𝑇𝐴𝑇