mikhail skopenkov

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Name	mikhail skopenkov
Member for	2 years
Seen	Jan 19 at 10:40
Website	skopenkov.ru
Location	Moscow
Age	30

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Pythagorean 5-tuples

may 13 11 at 22:06 Geoff Robinson 9,856●1●21●27

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909

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Convergence of finite element method: counterexamples

na.numerical-analysis ap.analysis-of-pdes elliptic-pde counterexamples

sep 13 11 at 13:47 mikhail skopenkov 966●2●13

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354

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Is the ring of quaternionic polynomials factorial?

ra.rings-and-algebras quaternions factorization noncommutative-algebra polynomials

mar 5 12 at 14:07 mikhail skopenkov 966●2●13

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928

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When the determinant of a 2x2 polynomial matrix is a square?

ra.rings-and-algebras ac.commutative-algebra determinants matrices quaternions

mar 6 12 at 13:05 David Speyer 55.1k●3●102●236

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723

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Canonical form for a pair of quadratic forms

ra.rings-and-algebras quadratic-forms matrices binary-quadratic-forms

jul 16 11 at 0:39 A. Lerario 103●4

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525

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Isolated conics on a del Pezzo surface

ag.algebraic-geometry conic-sections algebraic-surfaces divisors

may 11 11 at 9:52 Dmitri 16.6k●1●36●77

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649

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Names of certain surfaces

ag.algebraic-geometry dg.differential-geometry algebraic-surfaces surfaces variational-calculus

jun 4 11 at 19:34 mikhail skopenkov 966●2●13

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203

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Singular conics on certain algebraic surfaces

ag.algebraic-geometry algebraic-surfaces conic-sections elliptic-curves

jul 2 11 at 12:08 mikhail skopenkov 966●2●13

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Conditions under which the degree of an algebraic surface equals the degree of its planar section

ag.algebraic-geometry reference-request

jun 3 at 10:15 mikhail skopenkov 966●2●13

Answers

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Is the Laplacian on a manifold the limit of graph Laplacians?

An Erdős-Szekeres-type question

Is the ring of quaternionic polynomials factorial?

Parametrization of the intersection of an ellipsoid with a sphere

Probability of returning to starting point before hitting adjacent point for RW on Z^2

Generalised linking numbers (where they shouldn’t be)

Coefficients in cohomology

Is there a classification of open subsets of euclidean space up to homeomorphism?

Examples of seemingly elementary problems that are hard to solve?

Parametrizing the realization space of a polyhedron by its edges

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251

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Questions

Pythagorean 5-tuples

Convergence of finite element method: counterexamples

Is the ring of quaternionic polynomials factorial?

When the determinant of a 2x2 polynomial matrix is a square?

Canonical form for a pair of quadratic forms

Isolated conics on a del Pezzo surface

Names of certain surfaces

Singular conics on certain algebraic surfaces

Conditions under which the degree of an algebraic surface equals the degree of its planar section

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