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21:58 Loviscach, Jörn German 2011

03.1 2 Matrizen, Transposition, MATLAB(R)

  • Published: 2011
  • Publisher: Loviscach, Jörn
  • Language: German
40:27 Loviscach, Jörn German 2011

01.1 Überblick 2. Semester; Lineare Algebra, Differentialgleichungen usw.

  • Published: 2011
  • Publisher: Loviscach, Jörn
  • Language: German
22:26 Loviscach, Jörn German 2011

16.2 Raum der Funktionen mit Periode 1, Skalarprodukt, RMS

  • Published: 2011
  • Publisher: Loviscach, Jörn
  • Language: German
16:00 Loviscach, Jörn German 2011

01.2.4 Vektorraum

  • Published: 2011
  • Publisher: Loviscach, Jörn
  • Language: German
10:04 Loviscach, Jörn German 2011

02.2.2.1 Skalarprodukt, Teil 1

  • Published: 2011
  • Publisher: Loviscach, Jörn
  • Language: German
13:43 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 6

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:52 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 4

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
13:52 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 2

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
26:37 FOSSGIS e.V. German 2014

Deegree: AIXM WFS und WPS Services - GML Anwendungen im Aviation Bereich

Um einen sicheren und geordneten Ablauf des Flugverkehrs zu gewährleisten, sind verlässliche Informationen zu den aktuellen Verkehrsbedingungen für alle Beteiligten, wie z.B. Piloten und Fluglotsen, von entscheidener Bedeutung. Für die Bereitstellung der aktuellen Informationen bezüglich Luftraumstruktur, Flugplätzen, Flugrouten und Flugsicherungsverfahren wird AIXM 5.1, der Standard für den weltweiten Austausch von aeronautischen Informationen, eingesetzt. Dieser Standard wurde gemeinsam von der FAA und EUROCONTROL in Form eines Applikation Schemas auf Basis von GML entwickelt (www.aixm.aero). Die Übertragung der AIXM Messages kann ähnlich wie bei den INSPIRE Download Services über das OGC WFS 2.0 Protokoll abgewickelt werden. Die Anforderungen an das GML Framework sind jedoch ungleich höher. Neben den komplexen Geometrie Objekten stellt insbesondere das AIXM Temporality Model, in dem die zeitliche Komponente der aeronautischen Information beschrieben wird, eine Herausforderung dar. In dem Vortrag wird gezeigt, wie eine erfolgreiche Umsetzung von AIXM WFS Services mit dem deegree Framework gelungen ist und wie sich mit der leistungsfähigen GML API die Verarbeitung von AIXM Daten problemlos gestaltet. Am Beispiel eines Spatial Processing Services und eines AIXM Business Rules Validators werden die professionellen Einsatzmöglichkeiten von AIXM Web Processing Services (WPS) mit dem deegree Framework demonstriert.
  • Published: 2014
  • Publisher: FOSSGIS e.V.
  • Language: German
13:21 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 7 : Strange Attractors - The butterfly effect

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:20 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 1 : Motion and determinism - Panta Rhei

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:30 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 9 : Chaotic or not - Research today

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:51 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 7

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
41:32 droidcon Berlin English 2015

Android reactive programming with Rxjava

In a world where there is a smartphone in every pocket, designing and building applications that can run smoothly and provide the User Experience that users will like it’s the only way to go. Reactive Programming style with RxJava will help you to beat Android Platform limitations to create astonishing Android Apps. This talk will be a practical journey from basic Reactive Programming and Observer Pattern concepts to the main feature of RxJava, with practical code examples and a real-world app. I'll show the audience how to create an Observable "from scratch", from a list or from a function we already have in our code base. Our listeners will learn how to filter an Observable sequence to create a new sequence containing only the values we want; they will learn how to apply a function to an Observable, how to concatenate, merge or zip Observables. I'll show how to enjoy RxAndroid Schedulers to overcome the threading and concurrency hell in Android. I will close the talk with a practical example about RxJava + Retrofit, to easily communicate with a REST API.
  • Published: 2015
  • Publisher: droidcon Berlin
  • Language: English
26:30 FOSSGIS e.V. German 2015

Offene Geodaten-Lage von Orten im Vergleich

Offene Geodaten bezüglich der Lage von Orten (GeoNames Geographical Database, OSM, Wikipedia) werden vergleichend miteinander und in Bezug zu offenen amtlichen Geodaten untersucht. Die Lage von Orten (wie Städte, Gemeinden und Siedlungen) ist eine wichtige Grundlage für die Erstellung von Karten und für diverse Geoanwendungen. Solche Daten stehen im zunehmenden Maße zur Verfügung. Neben der "GeoNames Geographical Database" mit rund 2,8 Millionen Orten stellen u.a. OpenStreetMap und Wikipedia weltweite Ortskoordinaten zur Verfügung. Folgende Aspekte haben insbesondere Bedeutung: * die Nutzbarkeit der Daten: Einfachheit des Zugriffs, bereitgestellte Attribute und Zuordnungsmöglichkeiten zu einem gegebenen Ort; letztgenanntes ist Voraussetzung für Mashups, * die Vollständigkeit der Daten und * die Qualität der Koordinaten. Für den erstgenannten Aspekt wurden die genannten Datenquellen zunächst hinsichtlich eines Anforderungskataloges bewertet und verglichen. Für alle drei Aspekte wurden experimentelle Vergleiche für vier Ortsgruppen durchgeführt: (a) Gemeinden in Deutschland, (b) Populated Places in Neuseeland, (c) Localidades in Argentinien und (d) Townships in China. Für die drei ersten Gruppen wurden zudem offene amtliche Geodaten herangezogen. Im Rahmen studentischer Aufgaben sind (für Teilaufgaben) Vergleichs- und Visualisierungswerkzeuge auf Basis der Open-Source-Bibliothek GeoTools in Java entwickelt worden.
  • Published: 2015
  • Publisher: FOSSGIS e.V.
  • Language: German
26:32 FOSSGIS e.V. German 2015

Straßenrennen in der Innenstadt

Der Gründer des Open-Source-Projekts OSM2World erzählt von einer weiteren spannenden Anwendungsmöglichkeit des 3D-Renderers: Die Erstellung von Rennstrecken für das Computerspiel SuperTuxKart. Seit es die Möglichkeit gibt, 3D-Daten in OpenStreetMap zu erfassen, wird gerne auch die Verwendung in Computerspielen als Anwendungsfall genannt. Einige kommerzielle Beispiele dazu gibt es schon länger; dass dies aber auch mit Open-Source-Tools möglich ist, wird hier mit der Erstellung von Rennstrecken für das freie Spiel SuperTuxKart unter Beweis gestellt. Der Vortrag beschreibt die Vorgehensweise, um die OSM-Daten einer Stadt in eine Rennstrecke zu verwandeln. Voraussetzung ist eine ausreichend gute Abdeckung der jeweiligen Region mit 3D-Attributen in OpenStreetMap. Solche Daten, insbesondere zu Gebäuden und Straßen, werden von der Community zunehmend erfasst. Aus diesen Daten wird mit dem 3D-Renderer OSM2World ein realitätsnahes 3D-Modell erstellt, das optional auch mit einem Geländemodell ergänzt werden kann. In diesem 3D-Modell werden mit dem 3D-Modelling-Tool Blender noch einige Verbesserungen vorgenommen und der gewünschte Streckenverlauf eingezeichnet. Ein Blender-Plugin erlaubt schließlich den Export einer fertigen Strecke für SuperTuxKart. Stolperfallen sind dabei unter anderem subtile Unterschiede bei der Interpretation der Daten zwischen den beteiligten Anwendungen. Auf solche technischen Hürden wird dabei ebenso eingegangen wie auf neue Features in OSM2World, die diesen Anwendungsfall möglich gemacht haben.
  • Published: 2015
  • Publisher: FOSSGIS e.V.
  • Language: German
1:02:05 Institut des Hautes Études Scientifiques (IHÉS) English 2014

2/4 Automorphic forms in higher rank

  • Published: 2014
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:15:07 Institut des Hautes Études Scientifiques (IHÉS) English 2015

Quantum Geometry and Strings

  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
49:58 Institut des Hautes Études Scientifiques (IHÉS) English 2013

Counterterms in gravity and N = 8 Supergravity

I will discuss counterterms in gravity using the light-cone frame formulation and show that also in this fully gauge fixed formulation we do need a local symmetry to find the correct counter terms.
  • Published: 2013
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
23:53 Institut des Hautes Études Scientifiques (IHÉS) English 2013

Quantum Kac-Moody algebras and categorifications

  • Published: 2013
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:41:20 Institut des Hautes Études Scientifiques (IHÉS) English 2014

1/3 Mathematical Physics of Hurwitz numbers

Hurwitz numbers enumerate ramified coverings of a sphere. Equivalently, they can be expressed in terms of combinatorics of the symmetric group; they enumerate factorizations of permutations as products of transpositions. It turns out that these numbers obey a huge number of relations represented in the form of partial differential equations for their generating function. This includes equations of the KP hierarchy, Virasoro-type constraints, Chekhov-Eynard-Orantin-type recursion and others. Only a few of these relations can be derived from elementary combinatorics of permutations. All other relations follow from a deep relationship of Hurwitz numbers with moduli spaces of curves, Gromov-Witten invariants, matrix models, integrable systems and other domains of mathematics which are often referred to as `mathematical physics'. When discussing Hurwitz numbers in the talks, we consider them, thereby, as a sufficiently elementary but highly nontrivial model of all mentioned theories where all computations can be fulfilled completely, and all formulated relations can be checked explicitly in computer experiments.
  • Published: 2014
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:05:36 Institut des Hautes Études Scientifiques (IHÉS) English 2015

Approaches to quantum gravity

At this time, we do not have a theory of quantum gravity. In this talk I will first reiterate the reasons why such a theory is absolutely needed, and then review some of the proposals towards it, with special emphasis on `non-string' approaches. The presentation will be kept mostly at a general and introductory level.
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:17:54 Institut des Hautes Études Scientifiques (IHÉS) English 2015

Quantum Field Theory and Gravitation

The incorporation of gravity into quantum physics is still an essentially open problem. Quantum field theory under the influence of an external gravitational field, on the other side, is by now well understood. I is remarkable that, nevertheless, its consistent treatment required a careful revision of traditional quantum field theory in the spirit of algebraic quantum field theory. Moreover, it allows a background independent perturbative construction of quantum gravity as an effective theory.
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
2:25:34 Institut des Hautes Études Scientifiques (IHÉS) English 2015

3/3 Supersymmetric Vacua and Integrability

"I review the relationship between supersymmetric gauge theories and quantum integrable systems. From the quantum integrability side this relation includes various spin chains, as well as many well-known quantum many body systems like elliptic Calogero-Moser system and generalisations. From the gauge theory side one has supersymmetric gauge theories with four (and eight) supercharges in various space-time dimensions (compactified to two-dimensions, or in Omega-background). Gauge theory perspective provides the exact energy spectrum of corresponding quantum integrable system. Key elements, usually appearing in the topic of quantum integrability, such as Baxter equation, Yang-Yang function, Bethe equation, spectral curve, Yangian, quantum affine algebra, quantum elliptic algebra - all acquire meaning in the supersymmetric gauge theory." 29 avril 2015
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:01:45 Institut des Hautes Études Scientifiques (IHÉS) English 2014

4/4 Analytic number theory around torsion homology

  • Published: 2014
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
45:19 Institut des Hautes Études Scientifiques (IHÉS) English 2013

Equations for stability­

  • Published: 2013
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:54:58 Institut des Hautes Études Scientifiques (IHÉS) English 2013

3/4 Mathematical Structures arising from Genetics and Molecular Biology

  • Published: 2013
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:50:24 Institut des Hautes Études Scientifiques (IHÉS) English 2015

2/4 Singular support of coherent sheaves

Singular support is an invariant that can be attached to a coherent sheaf on a derived scheme which is quasi-smooth (a.k.a. derived locally complete intersection). This invariant measures how far a given coherent sheaf is from being perfect. We will explain how the subtle difference between "coherent" and "perfect" is responsible for the appearance of Arthur parameters in the context of geometric Langlands correspondence.
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
2:06:56 Institut des Hautes Études Scientifiques (IHÉS) English 2015

2/4 Motivic periods and the cosmic Galois group

In the 1990's Broadhurst and Kreimer observed that many Feynman amplitudes in quantum field theory are expressible in terms of multiple zeta values. Out of this has grown a body of research seeking to apply methods from algebraic geometry and number theory to problems in high energy physics. This talk will be an introduction to this nascent area and survey some recent highlights. Most strikingly, ideas due to Grothendieck (developed by Y. André) suggest that there should be a Galois theory of certain transcendental numbers defined by the periods of algebraic varieties. Many Feynman amplitudes in quantum field theories are of this type. P. Cartier suggested several years ago applying these ideas to amplitudes in perturbative physics, and coined the term `cosmic Galois group'. One of my goals will be to describe how to set up such a theory rigorously, define a cosmic Galois group, and explore its consequences and unexpected predictive power. Topics to be addressed will include: 1) A Galois theory of periods, multiple zeta values. 2) Parametric representation of Feyman integrals and their mixed Hodge structures. 3) Operads and the principle of small graphs. 4) The cosmic Galois group: results, counterexamples and conjectures.
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:55:07 Institut des Hautes Études Scientifiques (IHÉS) English 2015

4/4 Exponential Integral

  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:54:26 Institut des Hautes Études Scientifiques (IHÉS) English 2015

1/4 Motivic periods and the cosmic Galois group

In the 1990's Broadhurst and Kreimer observed that many Feynman amplitudes in quantum field theory are expressible in terms of multiple zeta values. Out of this has grown a body of research seeking to apply methods from algebraic geometry and number theory to problems in high energy physics. This talk will be an introduction to this nascent area and survey some recent highlights. Most strikingly, ideas due to Grothendieck (developed by Y. André) suggest that there should be a Galois theory of certain transcendental numbers defined by the periods of algebraic varieties. Many Feynman amplitudes in quantum field theories are of this type. P. Cartier suggested several years ago applying these ideas to amplitudes in perturbative physics, and coined the term `cosmic Galois group'. One of my goals will be to describe how to set up such a theory rigorously, define a cosmic Galois group, and explore its consequences and unexpected predictive power. Topics to be addressed will include: 1) A Galois theory of periods, multiple zeta values. 2) Parametric representation of Feyman integrals and their mixed Hodge structures. 3) Operads and the principle of small graphs. 4) The cosmic Galois group: results, counterexamples and conjectures.
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:45:37 Institut des Hautes Études Scientifiques (IHÉS) English 2015

1/4 Singular support of coherent sheaves

Singular support is an invariant that can be attached to a coherent sheaf on a derived scheme which is quasi-smooth (a.k.a. derived locally complete intersection). This invariant measures how far a given coherent sheaf is from being perfect. We will explain how the subtle difference between "coherent" and "perfect" is responsible for the appearance of Arthur parameters in the context of geometric Langlands correspondence.
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:03:48 Institut des Hautes Études Scientifiques (IHÉS) English 2015

2/3 Classical transversality methods in SFT

In this talk I will discuss two transversality results that are standard but perhaps not so widely understood: (1) Dragnev's theorem that somewhere injective curves in symplectizations are regular for generic translation-invariant J, and (2) my theorem on automatic transversality in 4-dimensional symplectic cobordisms (which generalizes earlier results for closed curves by Gromov, Hofer-Lizan-Sikorav and Ivashkovich-Shevchishin). The common feature of these two theorems is that both can be proved by considering the restriction of the usual linearized Cauchy-Riemann operator to the "generalized normal bundle" of a (not necessarily immersed) holomorphic curve.
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
2:20:05 Institut des Hautes Études Scientifiques (IHÉS) English 2015

2/3 Supersymmetric Vacua and Integrability

"I review the relationship between supersymmetric gauge theories and quantum integrable systems. From the quantum integrability side this relation includes various spin chains, as well as many well-known quantum many body systems like elliptic Calogero-Moser system and generalisations. From the gauge theory side one has supersymmetric gauge theories with four (and eight) supercharges in various space-time dimensions (compactified to two-dimensions, or in Omega-background). Gauge theory perspective provides the exact energy spectrum of corresponding quantum integrable system. Key elements, usually appearing in the topic of quantum integrability, such as Baxter equation, Yang-Yang function, Bethe equation, spectral curve, Yangian, quantum affine algebra, quantum elliptic algebra - all acquire meaning in the supersymmetric gauge theory." 22 avril 2015
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
2:22:26 Institut des Hautes Études Scientifiques (IHÉS) English 2015

1/3 Supersymmetric Vacua and Integrability

"I review the relationship between supersymmetric gauge theories and quantum integrable systems. From the quantum integrability side this relation includes various spin chains, as well as many well-known quantum many body systems like elliptic Calogero-Moser system and generalisations. From the gauge theory side one has supersymmetric gauge theories with four (and eight) supercharges in various space-time dimensions (compactified to two-dimensions, or in Omega-background). Gauge theory perspective provides the exact energy spectrum of corresponding quantum integrable system. Key elements, usually appearing in the topic of quantum integrability, such as Baxter equation, Yang-Yang function, Bethe equation, spectral curve, Yangian, quantum affine algebra, quantum elliptic algebra - all acquire meaning in the supersymmetric gauge theory."
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
1:10:44 Institut des Hautes Études Scientifiques (IHÉS) English 2015

1/2 Introduction to Polyfold Regularization

This lecture will discuss the overall ideas and challenges in regularizing moduli spaces, and introduce the two basic ideas behind polyfold theory: Making reparametrization actions "smooth" and making pregluing a "chart map". [related literature: Sections 2.1 and 3.3 of Polyfolds: A First and Second Look. Related videos: Lecture 8 and Lecture 20 from Wehrheim's special topics course.]
  • Published: 2015
  • Publisher: Institut des Hautes Études Scientifiques (IHÉS)
  • Language: English
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