I’ve been asleep at the switch; this announcement is probably too late for anyone outside the UK. But still, it’s great to see how applied category theory is taking off! And this conference is part of a series, so if you miss this one you can still go to the next.

• Second Symposium on Compositional Structures (SYCO2), 17-18 December 2018, University of Strathclyde, Glasgow.

#### Accepted presentations

http://events.cs.bham.ac.uk/syco/2/accepted.html

#### Registration

Please register asap so that catering can be arranged. Late registrants

might go hungry.

#### Invited speakers

• Corina Cirstea, University of Southampton – Quantitative Coalgebras for

Optimal Synthesis

• Martha Lewis, University of Amsterdam – Compositionality in Semantic Spaces

#### Description

The Symposium on Compositional Structures (SYCO) is an interdisciplinary series of meetings aiming to support the growing community of researchers interested in the phenomenon of compositionality, from both applied and abstract perspectives, and in particular where category theory serves as a unifying common language. The first SYCO was held at the School of Computer Science, University of Birmingham, 20-21 September, 2018, attracting 70 participants.

We welcome submissions from researchers across computer science, mathematics, physics, philosophy, and beyond, with the aim of fostering friendly discussion, disseminating new ideas, and spreading knowledge between fields. Submission is encouraged for both mature research and work in progress, and by both established academics and junior researchers, including students.

Submission is easy, with no format requirements or page restrictions. The meeting does not have proceedings, so work can be submitted even if it has been submitted or published elsewhere.

While no list of topics could be exhaustive, SYCO welcomes submissions with a compositional focus related to any of the following areas, in particular from the perspective of category theory:

• logical methods in computer science, including classical and quantum programming, type theory, concurrency, natural language processing and machine learning;

• graphical calculi, including string diagrams, Petri nets and reaction networks;

• languages and frameworks, including process algebras, proof nets, type theory and game semantics;

• abstract algebra and pure category theory, including monoidal category

theory, higher category theory, operads, polygraphs, and relationships to homotopy theory;

• quantum algebra, including quantum computation and representation theory;

• tools and techniques, including rewriting, formal proofs and proof assistants, and game theory;

• industrial applications, including case studies and real-world problem

descriptions.

This new series aims to bring together the communities behind many previous successful events which have taken place over the last decade, including “Categories, Logic and Physics”, “Categories, Logic and Physics (Scotland)”, “Higher-Dimensional Rewriting and Applications”, “String Diagrams in Computation, Logic and Physics”, “Applied Category Theory”, “Simons Workshop on Compositionality”, and the “Peripatetic Seminar in Sheaves and Logic”.

SYCO will be a regular fixture in the academic calendar, running regularly throughout the year, and becoming over time a recognized venue for presentation and discussion of results in an informal and friendly atmosphere. To help create this community, and to avoid the need to make difficult choices between strong submissions, in the event that more good-quality submissions are received than can be accommodated in the timetable, the programme committee may choose to *defer* some submissions to a future meeting, rather than reject them. This would be done based largely on submission order, giving an incentive for early submission, but would also take into account other requirements, such as ensuring a broad scientific programme. Deferred submissions would be accepted for presentation at any future SYCO meeting without the need for peer review. This will allow us to ensure that speakers have enough time to present their ideas, without creating an unnecessarily competitive reviewing process. Meetings would be held sufficiently frequently to avoid a backlog of deferred papers.

#### PROGRAMME COMMITTEE

Ross Duncan, University of Strathclyde

Fabrizio Romano Genovese, Statebox and University of Oxford

Jules Hedges, University of Oxford

Chris Heunen, University of Edinburgh

Dominic Horsman, University of Grenoble

Aleks Kissinger, Radboud University Nijmegen

Eliana Lorch, University of Oxford

Guy McCusker, University of Bath

Samuel Mimram, École Polytechnique

Koko Muroya, RIMS, Kyoto University & University of Birmingham

Paulo Oliva, Queen Mary

Nina Otter, UCLA

Simona Paoli, University of Leicester

Robin Piedeleu, University of Oxford and UCL

Julian Rathke, University of Southampton

Bernhard Reus, Univeristy of Sussex

David Reutter, University of Oxford

Mehrnoosh Sadrzadeh, Queen Mary

Pawel Sobocinski, University of Southampton (chair)

Jamie Vicary, University of Birmingham and University of Oxford (co-chair)