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In linear algebra, the main diagonal (sometimes principal diagonal, primary diagonal, leading diagonal, or major diagonal) of a matrix is the collection of entries where . The following three matrices have their main diagonals indicated by red 1's: : The antidiagonal (sometimes counterdiagonal, secondary diagonal, trailing diagonal or minor diagonal) of a dimension square matrix, , is the collection of entries such that . That is, it runs from the top right corner to the bottom left corner: : == See also == * Diagonal matrix * Trace * Anti-diagonal matrix 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「main diagonal」の詳細全文を読む スポンサード リンク
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