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$ f(x, y)=(y-x^{2})(y-2x^{2}) $のグラフ。原点は、そこを通る全ての直線上で極小だが、$\mathbb{R}^{2}$全体では極小ではない。 mathtod.online/media/P_du366Cz

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Mathtodon

A Mastodon instance named Mathtodon, where you can post toots with beautiful mathematical formulae in TeX/LaTeX style.