The seventh Positivity conference will be held from July 22-26, 2013, at the science campus of Leiden University, The Netherlands, jointly organized by Leiden University and Delft University of Technology.

As with earlier issues, the conference is dedicated to ordered structures and their applications in a broad sense, including topics such as ordered Banach spaces and their operators, ordered Banach algebras, ordering in operator algebras, etc.

Invited speakers, all confirmed: Francesco Altomare (Bari, Italy) Wolfgang Arendt (Ulm, Germany) Karim Boulabiar (Tunis, Tunisia) Qingying Bu (University, Mississippi, USA) Guillermo Curbera (Sevilla, Spain) Julio Flores (Madrid, Spain) Yehoram Gordon (Haifa, Israel) Rien Kaashoek (Amsterdam, The Netherlands) Coenraad Labuschagne (Johannesburg, South Africa) Boris Mordukhovich (Detroit, Michigan, USA) Jan van Neerven (Delft, The Netherlands) Ioannis Polyrakis (Athens, Greece) Abdelaziz Rhandi (Salerno, Italy) Evgeny Semenov (Voronezh, Russia) Fedor Sukochev (Sydney, Australia) Jun Tomiyama (Tokyo, Japan)

All participants will be given the opportunity for a 30 minute contributed talk.

More details, and a list of the currently 130 pre-registered participants, can be found at

http://websites.math.leidenuniv.nl/positivity2013/

For further information, or for inclusion in the mailing list of the conference, please contact the organizers at positivity2013@gmail.com.

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------------------------------------------------------------------------ Marcel de Jeu Leiden University Tel. (office) +31 (0)71 527 7118 Mathematical Institute Tel. (general) +31 (0)71 527 7111 P.O. Box 9512 Fax +31 (0)71 527 7101 2300 RA Leiden email mdejeu@math.leidenuniv.nl The Netherlands URL http://www.math.leidenuniv.nl/~mdejeu/ ------------------------------------------------------------------------