[Math] Can rectangular matrix be a triangular matrix

linear algebra

I am confused with what is mentioned here:

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Linear algebra and its applications-David C. Lay

Update: This question may be closed. My comment to the answer below clarifies my misunderstanding with the text.

Best Answer

I'm not entirely sure what you're asking, but to answer your title question: a triangular matrix is a special kind of square matrix, while a rectangular matrix is a matrix for which horizontal and vertical dimensions are not the same (http://mathworld.wolfram.com/RectangularMatrix.html)

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