Inspired by the “generalized t-designs” defined by Cameron [P. J. Cameron, A generalisation of t-designs, Discrete Math. 309 (2009), 4835–4842], we define a new class of combinatorial designs which simultaneously provide a generalization of both covering designs and covering arrays. We then obtain a number of bounds on the minimum sizes of these designs, and describe some methods of constructin...

Correspondence to Dr. Silke Cameron, MD Department of Gastroenterology and Endocrinology, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany silke.cameron@med. uni-goettingen.de

this paper provides faunistic data for 27 species of cryptinae in iran, of which 12 species and three genera, buathra cameron, myrmeleonostenus uchida and glyphicnemis foerster, are newly recorded from iran. previously recorded species with related references are also included. distributional map is given for all species of cryptinae. this study increases the number of known species of iranian ...

Chris Baker Through the pipeline: The ABC of digital learning ..............................................................................i Don Cameron & Preparing older learners for the information age: ............................................ii

We discuss groups acting regularly on the Henson graphs Γn, answering a question posed by Peter Cameron, and we explore a number of related questions.