Table of Contents

## What do you think about multiplying a lower triangular matrix by a lower triangular matrix will the result be a lower triangular matrix?

The product of two lower triangular matrices is a lower triangular matrix. As a consequence, the product of any number of lower triangular matrices is a lower triangular matrix. If all the factor matrices are unit diagonal, then the resulting matrix is also unit diagonal.

**What is the difference between lower triangular matrix and upper triangular matrix?**

In the mathematical discipline of linear algebra, a triangular matrix is a special kind of square matrix. A square matrix is called lower triangular if all the entries above the main diagonal are zero. Similarly, a square matrix is called upper triangular if all the entries below the main diagonal are zero.

### What is the product of upper and lower triangular matrix?

The product of two upper (lower) triangular matrices is upper (lower) triangular matrix. The product of two unit upper (unit lower) triangular matrices is unit upper (unit lower) triangular matrix. Determinant of upper or lower triangular matrix is equal to the product of its diagonal elements.

**Is row echelon the same as upper triangular?**

A triangular is a square matrix while an echelon matrix is a rectangular matrix, it is more general. Any m×n matrix can be in row-echelon form. There is a requirement for a triangular matrix to be square. That is the difference.

#### What is the product of two upper triangular matrices?

The product of two upper triangular matrices is upper triangular. The product of two lower triangular matrices is lower triangular. . A triangular matrix is invertible if and only if its diagonal entries are non-zero.

**Can a 2×2 matrix be upper triangular?**

In other words, a square matrix is upper triangular if all its entries below the main diagonal are zero. Example of a 2 × 2 upper triangular matrix: A square matrix with elements sij = 0 for j > i is termed lower triangular matrix.

## Can a matrix be both upper triangular and lower triangular?

What is a Matrix Called if it is Both Upper and Lower Triangular? If a matrix is both lower and upper triangular, then all its non-diagonal elements are equal to zeros. In this case, it is called a diagonal matrix.

**Is the inverse of an upper triangular matrix upper triangular?**

A triangular matrix (upper or lower) is invertible if and only if no element on its principal diagonal is 0. If the inverse U−1 of an upper triangular matrix U exists, then it is upper triangular. If the inverse L−1 of an lower triangular matrix L exists, then it is lower triangular.

### What is the difference between echelon and reduced echelon form?

The echelon form of a matrix isn’t unique, which means there are infinite answers possible when you perform row reduction. Reduced row echelon form is at the other end of the spectrum; it is unique, which means row-reduction on a matrix will produce the same answer no matter how you perform the same row operations.

**Is echelon form upper triangular?**

A matrix is in row echelon form if all the empty (all-zero) rows are below all the nonzero rows, and the leftmost nonzero entry in a given row is to the right of the leftmost nonzero entry in the row above it. For example, an upper-triangular matrix is in row echelon form.

#### When multiplying matrices do you multiply the elements in each?

When you multiply a matrix by a number, you multiply every element in the matrix by the same number. This operation produces a new matrix, which is called a scalar multiple. In the example above, every element of A is multiplied by 5 to produce the scalar multiple, B.