If an experiment s is conducted on a parallel process p, then, in general, different processes may result from the experiment, due to the nondeterministic behaviour of p (in the notation of Milner (1980): p ~ p' for different p'). Process p is called determinate if the resulting processes are all equivalent (i.e., if p A=> p' and p ~ p", then p' and p" are equivalent). This means that, although...

Borgström et al. proposed a notion of symbolic bisimilarity for the Extended Spi Calculus [12]. They developed a prototype tool, called SBC (Symbolic Bisimulation Checker) [10] implementing observational equivalence checking for arbitrary processes using shared-key cryptography. However, it is based on hard-coded equational theories. We have partially extended SBC towards checking processes usi...

this article concerned on the study of signature submanifolds for curves under lie group actions se(2), sa(2) and for surfaces under se(3). signature submanifold is a regular submanifold which its coordinate components are dierential invariants of an associated manifold under lie group action, and therefore signature submanifold is a key for solving equivalence problems.