Invited Seminars Thematic month The five weeks |
## Sage DaysSage Days 20
## 1. DatesFrom February 22 to February 26, 2010. ## 2. Description of the week
- present the features of Sage and provide basic tutorials for both usage and development of Sage (an install party is also planned);
- study and discuss the possible uses of Sage in the education (especially on Wednesday);
- host the twentieth
*Sage days*, including programming sessions for developers, with a special focus on packages related to the themes of the other weeks- Algebraic combinatorics (Semi-groups, Coxeter groups, Representation Theory, graphs,...)
- Discretized dynamical systems (combinatorics on words, tilings, train-tracks, Rauzy classes of interval exchange transformations, origamis,...)
- Tilings
- Homology computation
- More generally, study the importance of the data structures for mathematical types.
## 3. SAGE serversThere is a SAGE server available from CIRM at the following local address: CIRM SAGE server on chatelet And a dedicated notebook for french high-school : http://sage.irem.univ-mrs.fr ## 4. Confirmed speakers- Franco Saliola, Florent Hivert and Sébastien Labbé:
*Introduction to Sage: Mini-course and Tutorials*
- Nicolas Thiéry: Introduction to Sage-Combinat: features, design, and tutorials
- Meinolf Geck:
*CHEVIE and the algorithmic theory of Coxeter groups and Hecke algebras*
- Jean-Éric Pin: Semigroupe, a package for computing finite semigroups
## 5. Schedule**Monday 22th****9h00-10h00**: David Kohel -*Introduction to sage*(video)**10h30-11h30**: Florent Hivert and Nicolas Thiery -*Introduction to Sage-Combinat*(video)**11h30-12h30**: Jean Michel -*CHEVIE and the algorithmic theory of Coxeter groups and Hecke algebras*(video 1, video 2)**14h00-15h30**: Florent Hivert, Sébastien Labbé and Franco Saliola -*Introduction to sage***15h30-18h30**:*Coding sprints***17h00-18h30**: Alejandro Maass -*Dynamical Cubes and Maximal Topological Nil-Factors*
**Tuesday 23th****9h00-10h30**: Florent Hivert, Sébastien Labbé and Franco Saliola -*Introduction to sage***10h30-11h30**: Jean-Éric Pin -*Semigroupe and the algorithmic theory of Semigroups***11h30-12h30**: Nicolas M. Thiéry -*Software modeling for mathematical computations - Analysis of user needs: objects and operations - Data structures and algorithms - Modularisation and code reuse: Categories for the working mathematics programmer*(video)**14h00-15h30**: Florent Hivert, Sébastien Labbé and Franco Saliola -*Introduction to sage***15h30-19h00 : Coding Sprints and parallel sessions****15h30-16h30**: Nicolas M. Thiéry -*Advanced Sage programming***16h30-18h30**: Jean Michel and Meinholf Geck -*CHEVIE tutorial and design discussion***16h30-18h30**: Julien Cassaigne -*The complexity of a morphic word*
**Wednesday 24th**: Journée sage dans l'enseignement**10h-10h30**: V. Delecroix et l'équipe de sage-combinat -*Présentation du logiciel Sage***10h30-12h00**:*Ateliers pratiques***12h00-12h30**Discussion Un retour sur une première utilisation et un projet de documentation pour le monde éducatif**14h00-14h50**: David Kohel -*Utilisation de Sage dans l'éducation, Visualisation, calcul, algèbre, cryptographie***14h50-15h50**: F. Maltey -*Sage pour accompagner l'enseignement***16h10-16h40**Des expériences et des projets- V. Delecroix -
*Utilisation lors d'un stage Hippocampe* - T. Dumont -
*Depuis le début de l'année scolaire 2008-2009, le département de mathématiques possède un serveur de calcul dédié au logiciel Sage. Cette expérience pilote touche les enseignements de mathématiques des trois années de Licence.*
- V. Delecroix -
**16h40-17h30**Table ronde -*Quelle place pour Sage dans l'éducation ? (chercheurs + développeurs + enseignants secondaires)*
**Thursday 25th****9h00-10h00**: Gabriela Schmithüsen -*Origamis and square tiled surfaces, an algorithmic approach to Teichmüller curves*(video)**10h30-11h30**: Xavier Provençal -*Data structures and algorithms on words for discrete geometry*(video)**11h30-12h30**: Jean-Éric Pin -*Semigroupe and the algorithmic theory of Semigroups*(video)**14h00-19h00 : Coding Sprints and parallel sessions****15h00-16h00**: Nicolas Thiery -*Implementing Hopf algebras***16h30-18h30**: Vincent Delecroix -*Rauzy class of permutations, Rauzy graphs of languages and the automaton of train tracks*
**Friday 26th****10h30-12h30 : Coding Sprints and parallel sessions**- Samuel Lelievre and Gabriela Schmithüsen -
*Origamis and square tiled surfaces, an algorithmic approach to Teichmüller curves* - Nicolas M. Thiéry -
*Sage-Combinat workflow*(video)
- Samuel Lelievre and Gabriela Schmithüsen -
**14h00-14h30**: Florent Hivert -*Using iterators***14h30-15h30**:*Final status report*(video) (video of gap3 interface)**15h30-18h30**:*Coding sprints*
See also this page.
*Title*: Dynamical Cubes and Maximal Topological Nil-Factors*Abstract*: In this talk we will present a common work with Bryna Kra and Bernard Host. We introduce the notion of cubes in topological dynamics and we use them to construct the maximal nil-factors of a system. A detailed proof of the case of a rotation is presented as a motivation example. The proof of the general case is based on the measure theoretical developments by Host and Kra to prove the structure theorems behind the non-standard ergodic averages.
## 6. Wednesday February 24th : Sage in educationThis session will be French speaking, since it aims to discuss with some high school teachers. Journée organisée en partenariat avec l'IREM. Le programme (provisoire) : - 10h Présentation du logiciel Sage
- 10h30 Premiers pas avec Sage
- 11H30 Exposé de recherche
- 14h Ateliers pratiques
- 16h Table ronde : quelle place pour Sage dans l'éducation ?
- 17h30 Fin (apéro)
Il y a une page dédiée à l'organisation ici : Journée sage dans l'enseignement ## 7. Additional organizersMore organizers joined the organizing committee in the preparation of this week: - Franco Saliola
- Nicolas Thiéry
- Vincent Delecroix
- Anne Crumiere
- Sébastien Labbé (LaCIM, LIRMM)
## 8. Currently uploaded slides- NicolasThiery - sage-combinat slides.pdf ... 4,645,315 bytes ... 08 March 2010 à 16h35
- XavierProvencal-ALinearTimeAndSpaceAlgorithmForDetectingPathIntersection.pdf ... 1,825,672 bytes ... 25 February 2010 à 15h03
## 9. Currently uploaded worksheets- CIRM_Tutorial_1.sws ... 4,503 bytes ... 26 February 2010 à 18h56
- CIRM_Tutorial_3.sws ... 123,752 bytes ... 26 February 2010 à 18h55
- CIRM_Tutoriel_1_francais.sws ... 4,868 bytes ... 05 March 2010 à 16h11
- CIRM_Tutoriel_3_francais.sws ... 124,680 bytes ... 05 March 2010 à 16h11
- DavidKohel - Introduction to Sage.sws ... 452,232 bytes ... 26 February 2010 à 18h57
- NicolasThiery - sage-combinat demonstration.sws ... 12,617 bytes ... 26 February 2010 à 18h58
## 10. VideosMany talks were video recorded : Videos. ## 11. ParticipantsSee the page Sage Days Participants ## 12. Workshops- Vincent Delecroix: Rauzy class of permutations, Rauzy graphs of languages and the automaton of train tracks.
- Samuel Lelièvre and Gabriella Schmithüsen are proposing a workshop about square-tiled translation surfaces.
- Thierry Monteil is proposing a workshop between theory and programming about an algorithm that finds the complexity of a substitutive word.
- Computation of simplicial homology related to combinatorial problems.
- Eva Curry would like a workshop on visualizing fractal sets, such as attractors of iterated function systems, in Sage.
- Speed dating with open source proposed by Sébastien Labbé. A workshop to show some nice open source software you think are usefull for your colleague. It's is a speed dating, so approximatively 5 minutes will be given for each presentation. What open source software do you use?
- Sébastien Labbé : Zotero
- Franco Saliola : DropBox
- Marc Mezzarobba : git, oprofile
- Paul Zimmermann : MPFR/MPFI and their use in Sage
- Tobias Columbas : IPE
- Nicolas Thiéry : sage mode in emacs
- Alexandre Blondin Massé : vim
- Thierry Monteil : gobby
- Adrien Boussicault : ratpoison
- The sage/combinat/words library by Sébastien Labbé. Presentation of the current state of the library. Discussion about the future improvements.
- How to contribute to sage by Sébastien Labbé and Nicolas Thiéry
- We realized there was a typo in the documentation of Disjoint Union of Enumerated Sets.
- To fix Sage, we followed the Walk Through the Development Process web page in the sage documentation.
- We created the ticket #8362 on the sage trac server and we attached the patch file we created.
## 13. Proposed coding sprints (add your suggestion) |

For any technical question or comment regarding this wiki, you can contact the wemaster.