point at infinity
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1: 1.13 Differential Equations
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Transformation of the Point at Infinity
…2: 23.20 Mathematical Applications
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►The curve is made into an abelian group (Macdonald (1968, Chapter 5)) by defining the zero element as the point at infinity, the negative of by , and generally on the curve iff the points
, , are collinear.
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3: 1.10 Functions of a Complex Variable
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►A function whose only singularities, other than the point at infinity, are poles is called a meromorphic function.
If the poles are infinite in number, then the point at infinity is called an essential singularity: it is the limit point of the poles.
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4: 21.7 Riemann Surfaces
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►Equation (21.7.1) determines a plane algebraic curve in , which is made compact by adding its points at infinity.
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5: 28.2 Definitions and Basic Properties
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►This equation has regular singularities at 0 and 1, both with exponents 0 and , and an irregular singular point at
.
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6: 2.7 Differential Equations
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►To include the point at infinity in the foregoing classification scheme, we transform it into the origin by replacing in (2.7.1) with ; see Olver (1997b, pp. 153–154).
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7: 1.9 Calculus of a Complex Variable
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§1.9(iv) Conformal Mapping
►The extended complex plane, , consists of the points of the complex plane together with an ideal point called the point at infinity. …8: 6.4 Analytic Continuation
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►Analytic continuation of the principal value of yields a multi-valued function with branch points at
and .
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9: 15.2 Definitions and Analytical Properties
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►As a multivalued function of , is analytic everywhere except for possible branch points at
, , and .
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10: 16.2 Definition and Analytic Properties
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►Elsewhere the generalized hypergeometric function is a multivalued function that is analytic except for possible branch points at
, and .
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