Jisho

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しゅたいかくせん 主対角線
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Noun
1. principal diagonal; main diagonal​Mathematics
Wikipedia definition
2. Main diagonal​In linear algebra, the main diagonal (sometimes leading diagonal or major diagonal or primary diagonal or principal 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.
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