main diagonal

American

noun

Mathematics.

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main diagonal

The identity matrix is a square matrix containing ones down the main diagonal and zeros everywhere else.

From Textbooks ● Feb. 13, 2015

The darkest squares along the main diagonal represent spots of closest interaction.

From Nature

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023