The coordinate curves of a parametrization x(u, v) constitute a Tchebyshef net if the lengths of the opposite sides of a
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The coordinate curves of a parametrization x(u, v) constitute a Tchebyshef net if the lengths of the opposite sides of a
The coordinate curves of a parametrization x(u, v) constitute a Tchebyshef net if the lengths of the opposite sides of any quadrilateral formed by them are equal. Show that a necessary and sufficient condition for this is ДЕ = OG ди = 0. ov
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