Reguläre Punkte/X^2+Y^3+Z^7+XYZ/Aufgabe

Bestimme die regulären Punkte der Abbildung

\varphi \colon \mathbb {R} ^{3}\longrightarrow \mathbb {R} ,\,(x,y,z)\longmapsto x^{2}+y^{3}+z^{7}+xyz.

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