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反変・共変ベクトル

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もはやAIでは必須の行列。googleのフレームワークTENSOFLOWにも使われているテンソル。
ここで少し学習するとき出てくるときにつまずくのが共変・反変ベクトル。
以下解説。
2次元でベクトルがある。
\begin{pmatrix}
a & b \
c & d
\end{pmatrix}

1 + 2 = 3\ 数式を改行する時にはバックスラッシュを2つ

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