2020
http://publications.mfo.de/handle/mfo/3734
Tue, 07 Feb 2023 18:41:43 GMT2023-02-07T18:41:43ZQuantum symmetry
http://publications.mfo.de/handle/mfo/3831
Quantum symmetry
Caspers, Martijn
The symmetry of objects plays a crucial role in many
branches of mathematics and physics. It allowed, for
example, the early prediction of the existence of new
small particles. “Quantum symmetry” concerns a
generalized notion of symmetry. It is an abstract
way of characterizing the symmetry of a much richer
class of mathematical and physical objects. In this
snapshot we explain how quantum symmetry emerges
as matrix symmetries using a famous example: Mermin’s
magic square. It shows that quantum symmetries
can solve problems that lie beyond the reach of
classical symmetries, showing that quantum symmetries
play a central role in modern mathematics.
Thu, 31 Dec 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/38312020-12-31T00:00:00ZCaspers, MartijnThe symmetry of objects plays a crucial role in many
branches of mathematics and physics. It allowed, for
example, the early prediction of the existence of new
small particles. “Quantum symmetry” concerns a
generalized notion of symmetry. It is an abstract
way of characterizing the symmetry of a much richer
class of mathematical and physical objects. In this
snapshot we explain how quantum symmetry emerges
as matrix symmetries using a famous example: Mermin’s
magic square. It shows that quantum symmetries
can solve problems that lie beyond the reach of
classical symmetries, showing that quantum symmetries
play a central role in modern mathematics.Shape space – a paradigm for character animation in computer graphics
http://publications.mfo.de/handle/mfo/3798
Shape space – a paradigm for character animation in computer graphics
Heeren, Behrend; Rumpf, Martin
Nowadays 3D computer animation is increasingly realistic
as the models used for the characters become
more and more complex. These models are typically
represented by meshes of hundreds of thousands or
even millions of triangles. The mathematical notion
of a shape space allows us to effectively model, manipulate,
and animate such meshes. Once an appropriate
notion of dissimilarity measure between different
triangular meshes is defined, various useful tools
in character modeling and animation turn out to coincide
with basic geometric operations derived from
this definition.
Wed, 07 Oct 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37982020-10-07T00:00:00ZHeeren, BehrendRumpf, MartinNowadays 3D computer animation is increasingly realistic
as the models used for the characters become
more and more complex. These models are typically
represented by meshes of hundreds of thousands or
even millions of triangles. The mathematical notion
of a shape space allows us to effectively model, manipulate,
and animate such meshes. Once an appropriate
notion of dissimilarity measure between different
triangular meshes is defined, various useful tools
in character modeling and animation turn out to coincide
with basic geometric operations derived from
this definition.Higgs bundles without geometry
http://publications.mfo.de/handle/mfo/3793
Higgs bundles without geometry
Rayan, Steven; Schaposnik, Laura P.
Higgs bundles appeared a few decades ago as solutions
to certain equations from physics and have attracted
much attention in geometry as well as other
areas of mathematics and physics. Here, we take a
very informal stroll through some aspects of linear
algebra that anticipate the deeper structure in the
moduli space of Higgs bundles.
Tue, 29 Sep 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37932020-09-29T00:00:00ZRayan, StevenSchaposnik, Laura P.Higgs bundles appeared a few decades ago as solutions
to certain equations from physics and have attracted
much attention in geometry as well as other
areas of mathematics and physics. Here, we take a
very informal stroll through some aspects of linear
algebra that anticipate the deeper structure in the
moduli space of Higgs bundles.Rotating needles, vibrating strings, and Fourier summation
http://publications.mfo.de/handle/mfo/3777
Rotating needles, vibrating strings, and Fourier summation
Zahl, Joshua
We give a brief survey of the connection between seemingly unrelated problems such as sets in the plane containing lines pointing in many directions, vibrating strings and drum heads, and a classical problem from Fourier analysis.
Mon, 21 Sep 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37772020-09-21T00:00:00ZZahl, JoshuaWe give a brief survey of the connection between seemingly unrelated problems such as sets in the plane containing lines pointing in many directions, vibrating strings and drum heads, and a classical problem from Fourier analysis.Quantum symmetry
http://publications.mfo.de/handle/mfo/3747
Quantum symmetry
Weber, Moritz
In mathematics, symmetry is usually captured using
the formalism of groups. However, the developments
of the past few decades revealed the need to go beyond
groups: to “quantum groups”. We explain the
passage from spaces to quantum spaces, from groups
to quantum groups, and from symmetry to quantum
symmetry, following an analytical approach.
Thu, 04 Jun 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37472020-06-04T00:00:00ZWeber, MoritzIn mathematics, symmetry is usually captured using
the formalism of groups. However, the developments
of the past few decades revealed the need to go beyond
groups: to “quantum groups”. We explain the
passage from spaces to quantum spaces, from groups
to quantum groups, and from symmetry to quantum
symmetry, following an analytical approach.Determinacy versus indeterminacy
http://publications.mfo.de/handle/mfo/3739
Determinacy versus indeterminacy
Berg, Christian
Can a continuous function on an interval be uniquely
determined if we know all the integrals of the function
against the natural powers of the variable? Following
Weierstrass and Stieltjes, we show that the answer is
yes if the interval is finite, and no if the interval is
infinite.
Wed, 22 Apr 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37392020-04-22T00:00:00ZBerg, ChristianCan a continuous function on an interval be uniquely
determined if we know all the integrals of the function
against the natural powers of the variable? Following
Weierstrass and Stieltjes, we show that the answer is
yes if the interval is finite, and no if the interval is
infinite.Vertex-to-self trajectories on the platonic solids
http://publications.mfo.de/handle/mfo/3737
Vertex-to-self trajectories on the platonic solids
Athreya, Jayadev S.; Aulicino, David
We consider the problem of walking in a straight line
on the surface of a Platonic solid. While the tetrahedron,
octahedron, cube, and icosahedron all exhibit
the same behavior, we find a remarkable difference
with the dodecahedron.
Wed, 15 Apr 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37372020-04-15T00:00:00ZAthreya, Jayadev S.Aulicino, DavidWe consider the problem of walking in a straight line
on the surface of a Platonic solid. While the tetrahedron,
octahedron, cube, and icosahedron all exhibit
the same behavior, we find a remarkable difference
with the dodecahedron.Random matrix theory: Dyson Brownian motion
http://publications.mfo.de/handle/mfo/3736
Random matrix theory: Dyson Brownian motion
Finocchio, Gianluca
The theory of random matrices was introduced by
John Wishart (1898–1956) in 1928. The theory was
then developed within the field of nuclear physics
from 1955 by Eugene Paul Wigner (1902–1995) and
later by Freeman John Dyson, who were both concerned
with the statistical description of heavy atoms
and their electromagnetic properties. In this snapshot,
we show how mathematical properties can have
unexpected links to physical phenomenena. In particular,
we show that the eigenvalues of some particular
random matrices can mimic the electrostatic repulsion
of the particles in a gas.
Wed, 15 Apr 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37362020-04-15T00:00:00ZFinocchio, GianlucaThe theory of random matrices was introduced by
John Wishart (1898–1956) in 1928. The theory was
then developed within the field of nuclear physics
from 1955 by Eugene Paul Wigner (1902–1995) and
later by Freeman John Dyson, who were both concerned
with the statistical description of heavy atoms
and their electromagnetic properties. In this snapshot,
we show how mathematical properties can have
unexpected links to physical phenomenena. In particular,
we show that the eigenvalues of some particular
random matrices can mimic the electrostatic repulsion
of the particles in a gas.From Betti numbers to ℓ²-Betti numbers
http://publications.mfo.de/handle/mfo/3735
From Betti numbers to ℓ²-Betti numbers
Kammeyer, Holger; Sauer, Roman
We provide a leisurely introduction to ℓ²-Betti numbers,
which are topological invariants, by relating
them to their much older cousins, Betti numbers. In
the end we present an open research problem about
ℓ²-Betti numbers.
Wed, 15 Apr 2020 00:00:00 GMThttp://publications.mfo.de/handle/mfo/37352020-04-15T00:00:00ZKammeyer, HolgerSauer, RomanWe provide a leisurely introduction to ℓ²-Betti numbers,
which are topological invariants, by relating
them to their much older cousins, Betti numbers. In
the end we present an open research problem about
ℓ²-Betti numbers.