We introduce some differences in the style defeasible information is represented and inferences are made in nonmonotonic reasoning. These, at first sight harmless, changes, in fact, helped us to discover a very important principle guiding how inferences should be drawn in nonmonotonic reasoning, we name it the exception-first principle or EFP. DLEF is our own variant for default logic complying...

We describe a monad for checked, explicitly typed exceptions, which provides as a simple Haskell library what for other languages is a native feature. Multi parameter type classes and overlapping instances are the only essential extensions to Haskell 98 required.

We present a fully abstract denotational model for a higher-order programming language combining call-by-value evaluation and local exceptions. The model is built using nominal game semantics and is the first one to achieve both effective presentability and freedom from “bad exception” constructs.

Choreography has recently emerged as a pragmatic and concise way of describing communication-based systems such as web services and financial protocols. Recent studies have investigated the transition from the design stage of a system to its implementation providing an automatic way of mapping a choreograhy into executable code. In this work, we focus on an extension of choreography with a comm...