[Submission deadline extended by a week to 20 March 2017. Consider contributing!] CALL FOR CONTRIBUTIONS 23rd International Conference on Types for Proofs and Programs, TYPES 2017 and EUTYPES Cost Action CA15123 meeting Budapest, Hungary, 29 May - 1 June 2017 http://types2017.elte.hu BACKGROUND The TYPES meetings are a forum to present new and on-going work in all aspects of type theory and its applications, especially in formalised and computer assisted reasoning and computer programming. The TYPES areas of interest include, but are not limited to: * foundations of type theory and constructive mathematics; * applications of type theory; * dependently typed programming; * industrial uses of type theory technology; * meta-theoretic studies of type systems; * proof assistants and proof technology; * automation in computer-assisted reasoning; * links between type theory and functional programming; * formalizing mathematics using type theory. We encourage talks proposing new ways of applying type theory. In the spirit of workshops, talks may be based on newly published papers, work submitted for publication, but also work in progress. FINANCIAL SUPPORT The last two days of TYPES 2017, May 31 - June 1 are supported by and organised under the auspices of EUTypes Cost Action CA15123 (https://eutypes.cs.ru.nl). On one of these days there will be an EUTypes Management Committee (MC) meeting. This means that for members of the EUTypes MC, the cost of travel and stay for these 2 days will be covered. There will likely be some funding for a limited number of other conference participants (speakers). The funding is subject to COST rules, and invitations will be sent out via the e-cost system after the 1st of May. INVITED SPEAKERS * Edwin Brady (University of St Andrews) * Sara Negri (University of Helsinki) * Jakob Rehof (TU Dortmund) CONTRIBUTED TALKS We solicit contributed talks. Selection of those will be based on extended abstracts/short papers of 2 pp formatted with easychair.cls. The submission site is https://easychair.org/conferences/?conf=types2017. Important dates: * submission of 2 pp abstract: 20 March 2017 * notified of acceptance/rejection: 17 April 2017 * camera-ready version of abstract: 8 May 2017 Camera-ready versions of the accepted contributions will be published in an informal book of abstracts for distribution at the workshop. POST-PROCEEDINGS Similarly to TYPES 2011 and TYPES 2013-2016, we intend to publish a post-proceedings volume in the Leibniz International Proceedings in Informatics (LIPIcs) series. Submission to that volume will be open for everyone. Tentative submission deadline: September 2017. PROGRAMME COMMITTEE * Andreas Abel (Chalmers University Gothenburg) * Thorsten Altenkirch (University of Nottingham) * José Espirito Santo (University of Minho) * Fredrik Nordvall Forsberg (University of Strathclyde) * Silvia Ghilezan (University of Novi Sad) * Hugo Herbelin (INRIA Paris-Rocquencourt) * Martin Hofmann (Ludwig Maximilian University of Munich) * Ambrus Kaposi (Eötvös Loránd University) (co-chair) * Tamás Kozsik (Eötvös Loránd University) (co-chair) * Assia Mahboubi (INRIA) * Alexandre Miquel (University of the Republic, Uruguay) * Leonardo de Moura (Microsoft Research, Redmond, USA) * Keiko Nakata (SAP, Potsdam) * Andrew Polonsky (University Paris Diderot) * Simona Ronchi Della Rocca (Università di Torino) * Aleksy Schubert (University of Warsaw) * Wouter Swierstra (Utrecht University) * Tarmo Uustalu (Tallinn University of Technology) TYPES STEERING COMMITTEE Marc Bezem, Herman Geuvers (chair), Hugo Herbelin, Zhaohui Luo, Ralph Matthes, Bengt Nordström, Andrew Polonsky, Aleksy Schubert, Tarmo Uustalu. ABOUT TYPES The TYPES meetings from 1990 to 2008 were annual workshops of a sequence of five EU funded networking projects. From 2009 to 2015, TYPES has been run as an independent conference series. From 2016, TYPES is partially supported by COST Action EUTypes CA15123. Previous TYPES meetings were held in Antibes (1990), Edinburgh (1991), Båstad (1992), Nijmegen (1993), Båstad (1994), Torino (1995), Aussois (1996), Kloster Irsee (1998), Lökeberg (1999), Durham (2000), Berg en Dal near Nijmegen (2002), Torino (2003), Jouy-en-Josas near Paris (2004), Nottingham (2006), Cividale del Friuli (2007), Torino (2008), Aussois (2009), Warsaw (2010), Bergen (2011), Toulouse (2013), Paris (2014), Tallinn (2015), Novi Sad (2016). CONTACT Email: info@types2017.elte.hu Organisers: Ambrus Kaposi, Tamás Kozsik, András Kovács and the Department of Programming Languages and Compilers at the Faculty of Informatics, Eötvös Loránd University, Budapest.