Download PDF by Samuel Zaidman: Abstract differential equations

By Samuel Zaidman

ISBN-10: 0273084275

ISBN-13: 9780273084273

ISBN-10: 0822484277

ISBN-13: 9780822484271

ISBN-10: 1584880112

ISBN-13: 9781584880110

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2. 1. Framed knots as mappings. A smooth unframed knot in 3-space is the image of a smooth embedding of a circle into ]R3. So, in singularity theory, an oriented knot is treated as an element of the set 0 of all COO-mappings of an oriented circle into ]R3. Formally, a nonsingular unframed oriented knot in 3-space is a connected component of the subset of 0 that consists of all the embeddings. In the theory of Vassiliev invariants of knots in ]R3 the key role is played by so-called singular knots.

5. Application of the recursive definition to certain special degenerations of framed knots implies the following result. 8. The values of an invariant on singular framed knots are subject to the 4-term, 3-term and commutativity relations: PROOF. The 4-term relation here is in fact the one that is induced from the Vassiliev theory of invariants of unframed knots by omitting the framing. It follows from the bifurcations of a generic triple point of the core. To prove the 4-term relation one can follow [8] to resolve the double points by the definition (see Figure 5).

We also call wave front the image of an oriented Legendre link I C ST*]R2 by the projection ST*]R2 ---+ ]R2. A generic wave front is an oriented and co-oriented plane curve which has only transverse self-intersections and an even number of semi-cubic cusps as singularities. A cusp is called positive (resp. negative) if the value of the covector which defines the co-orientation of the wave front at the cusp point on the velocity vector is nonnegative (resp. nonpositive) in a neighborhood of the cusp point.

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Abstract differential equations by Samuel Zaidman

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Categories: Differential Equations