Prove that the inverse of an invertible upper triangular matrix in $M_{n}(\mathbb{F})$ is upper triangular.
Added by Gloria S.
Step 1
Let $A \in M_{n}(\mathbb{F})$ be an invertible upper triangular matrix. This means that $A$ has the form: $$ A = \begin{pmatrix} a_{11} & a_{12} & \cdots & a_{1n} \\ 0 & a_{22} & \cdots & a_{2n} \\ \vdots & \vdots & \ddots & \vdots \\ 0 & 0 & \cdots & Show more…
Show all steps
Your feedback will help us improve your experience
Hanlin Sun and 97 other Linear Algebra educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Recommended Videos
Prove that (a) the inverse of an invertible upper triangular matrix is upper triangular. Repeat for an invertible lower triangular matrix. (b) the inverse of a unit upper triangular matrix is unit upper triangular. Repeat for a unit lower triangular matrix.
Matrices and Systems of Linear Equations
Elementary Matrices and the LU Factorization
Prove that an upper triangular $n \times n$ matrix is invertible if and only if all its diagonal entries are nonzero.
Ben B.
Prove that nxn matrix is invertible iff it has n pivots
Lien L.
Recommended Textbooks
Linear Algebra and Its Applications
Differential Equations and Linear Algebra
Elementary Linear Algebra: Applications Version
Watch the video solution with this free unlock.
EMAIL
PASSWORD