Finite-Dimensional Vector Spaces by the renowned mathematician Paul R. Halmos is a highly regarded textbook in linear algebra and functional analysis. Halmos is known for his "naive" approach to mathematics, which emphasizes intuitive understanding without sacrificing mathematical rigor. The book provides a thorough treatment of finite-dimensional vector spaces, covering topics such as linear transformations, inner product spaces, determinants, eigenvalues, orthogonality, canonical forms, etc. Many mathematicians and educators have praised the book for its clarity and depth. The book is widely used in undergraduate and graduate courses in mathematics and physics and is considered a classic text in the field.