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対角行列は最高ですが,対角化できない行列もあります.残念ですね. そこで出てくるのが「どんな行列でも三角行列に変形できるよ!」という話です.三角行列は「そこそこ」扱いやすい.そこまで悪くない.むしろちょっと嬉しい.そう思えるような解説をします.
The image is a detailed educational post about linear algebra, specifically focusing on transforming matrices into triangular form when diagonalization is not possible. It includes mathematical notation and explanations in Japanese, with diagrams and equations illustrating the process. The post text expresses a preference for diagonal matrices but acknowledges the utility of triangular matrices, suggesting a positive outlook on the topic. The image is well-composed, with clear text and diagrams, making it easy to follow for educational purposes.