 Semi-orthogonal matrix

A semi-orthogonal matrix is not a commonly defined term in linear algebra, but it may imply a concept that relates closely to orthogonal matrices or the properties of certain subsets of vectors in Euclidean spaces. To clarify, let's look at the concepts of orthogonal matrices and related ideas: 1. **Orthogonal Matrix**: A square matrix \( Q \) is orthogonal if its columns (and rows) are orthonormal vectors.