# Definitions for **main diagonal**

### This page provides all possible meanings and translations of the word **main diagonal**

### Princeton's WordNet

main diagonal, principal diagonal(noun)

the diagonal of a square matrix running from the upper left entry to the lower right entry

### Freebase

Main diagonal

In linear algebra, the main diagonal of a matrix is the collection of entries where is equal to . The main diagonal of a square matrix is the diagonal which runs from the top left corner to the bottom right corner. For example, the following matrix has 1s down its main diagonal: A square matrix like the above in which the entries outside the main diagonal are all zero is called a diagonal matrix. The sum of the entries on the main diagonal of a square matrix is known as the trace of that matrix. The main diagonal of a rectangular matrix is the diagonal which runs from the top left corner and steps down and right, until the right edge or the bottom edge is reached. The diagonal of a square matrix from the top right to the bottom left corner is called antidiagonal, counterdiagonal, secondary diagonal, or minor diagonal.

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"main diagonal." *Definitions.net.* STANDS4 LLC, 2015. Web. 30 Nov. 2015. <http://www.definitions.net/definition/main diagonal>.