The current proof of the PCP Theorem (i.e., NP = PCP(log, O(1))) is very complicated. One source of difficulty is the technically involved analysis of low-degree tests. Here, we r...
We prove an exponential lower bound for the length of any resolution proof for the same set of clauses as the one used by Urquhart [13]. Our contribution is a significant simpli...
The aim of this paper is an integration of graph grammars with different kinds of behavioural constraints, in particular with temporal logic constraints. Since the usual algebraic ...
Reiko Heckel, Hartmut Ehrig, Uwe Wolter, Andrea Co...
Abstract. Kamperman and Walters proposed the notion of a simulation of one rewrite system by another one, whereby each term of the simulating rewrite system is related to a term in...
It is important for programs to have modular correctness properties. We look at non-deterministic programs expressed as termrewriting systems which compute normal forms of input t...
Scientific visualization is becoming an important part of the curriculum in a number of disciplines. It is a very practical subject, but the commercially available visualization s...
The operation of a computer can be conceptualised as a large, discrete and constantly changing set of state information. However even for the simplest uni-processor the data set o...
Paul S. Coe, Laurence M. Williams, Roland N. Ibbet...