Assertion: curvature's form | /r/HasProperty | represented as the graph of a function
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text: The theorem on the non-existence in Euclidean space of a surface of complete negative curvature $ K \leq \textrm{ const } < 0 $ has a particularly strengthened form in the case of a surface which can be projected injectively onto a plane, i.e. which can be represented as the graph of a function $ z = f( x, y) $.