寒い中、学校数学嫌いのKidsと私塾の老先生とのトライアルが続いている。老先生も秋の収穫が終わり時間的に余裕ができたのである。
Quadratic Surfeces in Grapes3Dと題してのレッスンらしい。Grapes3Dではparametric plotが用いられている。Kidsは分かるかな？
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WolfranAlphaとの比較
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3D-XplorMath-Jを使用
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