In this paper the Recursive Path Ordering is adapted for proving termination of rewriting incrementally. The new ordering, called Recursive Path Ordering with Modules, has as ingredients not only a precedence but also an underlying ordering =B. It can be used for incremental (innermost) termination proofs of hierarchical unions by defining =B as an extension of the termination proof obtained fo...

CSCW systems provide computer mediated support for the collaboration of people working in a group. We investigate whether a speciication formalism for communicating processes can be used to describe the communicative aspects of these systems. Such a speciication should make the communication patterns evident and should allow for automatic generation of a computer program that implements it. In ...

LexLeader, a state of the art static symmetry breaking method, adds a lex ordering constraint for each variable symmetry of the problem to select the lexicographically least solution. In practice, the same method can also be used for partial symmetry breaking by breaking only a given subset of symmetries. We propose a new total ordering, reflex, as basis of a new symmetry breaking constraint th...

We consider how the OO notion of subtyping relates to lotos testing theory. In particular, we investigate which of the standard lotos preorders is a suitable instantiation of behavioural subtyping and argue that each of the main preorders, trace preorder, trace extension, reduction and extension, is in some way deecient. Then, in the light of pre and post condition based models of OO subtyping,...

Lawrence Livermore National Laboratory (LLNL) is currently involved in a long term study using time-lapse multiple frequency electromagnetic (EM) characterization at a waterflood enhanced oil recovery (EOR) site in California operated by Chevron Heavy Oil Division in Lost Hills, California (Figure 1). The petroleum industry’s interest and the successful imaging results from this project suggest...