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{{Short description|Special kind of square matrix}}
{{distinguish|text=a [[triangular array]], a related concept}}
{{for|the rings|triangular matrix ring}}{{Redirects here|Triangularization|the geometric process|Triangulation}}
In mathematics, a '''triangular matrix''' is a special kind of [[square matrix]]. A square matrix is called '''{{visible anchor|lower triangular}}''' if all the entries ''above'' the [[main diagonal]] are zero. Similarly, a square matrix is called '''{{visible anchor|upper triangular}}''' if all the entries ''below'' the main diagonal are zero.
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