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    Site Editor

    Département de Mathématiques d'Orsay 
    Bâtiment 307
    Faculté des Sciences d'Orsay
    Université Paris-Saclay
    F-91405 Orsay Cedex
    Tél. : +33 (0) 1-69-15-79-56

    Director of publication: Frédéric Rousset, Director of the Mathematics Department of Orsay.

    Intellectual property

    The Mathematical Institute of Orsay's website is a creative work and the exclusive property of the Mathematics Department of Orsay, protected by French and international legislation on intellectual property rights. No reproduction or representation of the site can be made that contravenes the rights of the Mathematics Department of Orsay arising from the aforementioned legislation. 

    Photo credits

    All photos visible on the website of the Mathematical Institute of Orsay were taken by @Christophe Peus for Paris-Saclay University. Any partial or full copy of the photos visible on this site requires agreement of the owner named above. In the case of error or missing credit, do not hesitate to contact us.  

    Website design 

    The design and development of this website were carried out by Collectif Cosme (www.collectif-cosme.com).

    Description of provided services

    All information provided on this site is for information purposes only and subject to change. The Mathematics Department of Orsay cannot be held responsible for omissions, inaccuracies, or deficiencies found on the site. 

    Personal data

    Personal data means any information that directly or indirectly identifies a physical person. We are likely to collect and store your personal data, in particular when you browse the site. This data is used to answer your requests and is not sold to third parties. Necessary cookies are those related to the operation of the site and the notification bar that may be used on the site. In accordance with the law n ° 78-17 of January 6, 1978, related to data processing, files, and freedoms (articles 38, 39, 40), you have the right of access, rectification, and deletion of data about you found on this site. To exercise this right, you can contact the site editor. If necessary, depending on the request, the Mathematics Department of Orsay is entitled to ask you to provide the request in the form of a written and signed document, accompanied by a copy of an ID document with your signature on it, specifying the address to which a response should be sent.

    Hypertext links

    This site contains hypertext links to other sites. The Mathematics Department of Orsay is not responsible for verifying the contents of such sites, and assumes no responsibility for what is on them.


    A cookie is a small information file stored by your Internet browser locally on your computing device (e.g., your hard drive). A cookie file allows its issuer, during its period of validity, to recognize the computing device concerned each time it accesses digital content containing cookies from the same issuer. Our cookie does not contain any personally identifying information. It only records information relating to the navigation by a computing device (computer, smartphone, etc.) of our site. It allows us to:

    • establish statistics on the use of various parts of our website.
    • modify how the website is displayed in order to match the preferences set for your computing device (resolution, operating system, etc.). 

    You can at any time configure your browser so that cookies are saved locally by your computing device or, on the contrary, are rejected, whether occasionally or always.  Such configuration steps are described in the help menu of your browser. Here are the operations to be carried out for the most common browsers:

    • Internet Explorer/Edge: select the "Tools" button (cog icon, top right), then "Internet options". Click on the "Confidential" tab, then under "Parameters" move the cursor up to block all cookies, or down to authorize all cookies, then click "OK". 
    • Firefox: click on the menu button (top right) and select "Options". Open the "Privacy and Security" panel and go to "History". In the drop-down menu next to "Rules for storing data", choose "Use personalized parameters for history". Tick "Accept cookies" to allow them, or untick to block them.   
    • Google Chrome: click on the menu button (top right) and go to "Parameters". At the bottom, click on "Advanced". In the "Confidentiality and Security" section, click on "Content parameters". Click on "Cookies". You can then treat cookies; next to "Blocked", put the slider in the "On" position.  
    • Safari: go to Safari > Preferences, click on "Confidentiality", and make your choice.