Volume 22, Issue 5-6

Special Issue in Honour of Professor George Janelidze, on the occasion of his 60th birthday. Proceedings of the "Workshop on Category Theory", an international conference at the Universidade de Coimbra, July 9-13, 2012

Issue Editors:

• Maria Manuel Clementino,
• Marino Gran,
• Manuela Sobral,
• Ross Street,
• Walter Tholen