👉 Cocomat, also known as a "companion" or "co-matrix," is a type of matrix that has both an upper and lower part. In other words, it is a matrix with two parts: an upper part and a lower part. The upper part is usually referred to as the main diagonal, while the lower part is often referred to as the subdiagonal or lower triangle. Cocomat matrices are used in many areas of mathematics, including algebraic geometry, topology
