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Viro's patchworking disproves Ragsdale's conjecture

Author: Jesús A De Loera; Frederick J Wicklin; University of Minnesota. Geometry Center.
Publisher: [Minneapolis] : The Geometry Center, ©1997.
Edition/Format:   VHS video : VHS tape : Animation   Visual material : English
Database:WorldCat
Summary:
This animated video explains new developments concerning Hilbert's sixteenth problem, still unsolved, dealing with ways nonsingular level sets of polynomials can be arranged in the projected plane. Mathematician Virginia Ragsdale had conjectured an upper bound on the number of topological circles resulting from algebraic curves of degree 2k. After almost 90 years, Oleg Viro has proposed a new combinatorial method  Read more...
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Details

Named Person: O I︠A︡ Viro; Virginia Ragsdale; Virginia Ragsdale; O I︠A︡ Viro
Material Type: Animation, Videorecording
Document Type: Visual material
All Authors / Contributors: Jesús A De Loera; Frederick J Wicklin; University of Minnesota. Geometry Center.
OCLC Number: 63886547
Description: 1 videocassette (8 min.) : sd., col. ; 1/2 in. + notes (1 sheet)
Details: VHS.
Responsibility: written and produced by Jesús A. De Loera and Frederick J. Wicklin.

Abstract:

This animated video explains new developments concerning Hilbert's sixteenth problem, still unsolved, dealing with ways nonsingular level sets of polynomials can be arranged in the projected plane. Mathematician Virginia Ragsdale had conjectured an upper bound on the number of topological circles resulting from algebraic curves of degree 2k. After almost 90 years, Oleg Viro has proposed a new combinatorial method for constructing curves, known as patchworking, which has shown counter-examples to the Ragsdale Conjecture.

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