Abstract
—In S n — over a field F which will generally be either the real or the complex one — consider a surface Φ defined as the locus of points x whose projective coordinates (x(0) x(1),..., x(n)) are functions of two parameters u and v. These functions will all be supposed continuous with derivatives of sufficiently high order.x u will denote the point\(\left( {\frac{{\partial {x^{\left( 0 \right)}}}}{{\partial u}},\frac{{\partial {x^{\left( 1 \right)}}}}{{\partial u}},...,\frac{{\partial {x^{\left( n \right)}}}}{{\partial u}}} \right) \) and other derivatives of x will be similarly denoted; x u and x v are called the first derived points of x. The tangent plane at x to Φ is the plane joining the independent points x, x u , x v .
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© 1971 Springer-Verlag Berlin Heidelberg
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Segre, B. (1971). Projective Differential Geometry of Systems of Linear Partial Differential Equations. In: Some Properties of Differentiable Varieties and Transformations. Ergebnisse der Mathematik und ihrer Grenzgebiete, vol 13. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65006-2_9
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DOI: https://doi.org/10.1007/978-3-642-65006-2_9
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-65008-6
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