In [1] Andrews studies elementary type theory, a form of Church’s type theory [12] without extensionality, descriptions, choice, and infinity. Since most of the automated search procedures implemented in Tps [4] do not build in principles of extensionality, descriptions, choice or infinity, they are essentially searching for proofs in elementary type theory. In particular, search procedures bas...

The Eternal system is a CORBA 2.0-compliant system that provides, in addition to the location transparency and the interoperability inherent in the CORBA standard, support for replicated objects and thus fault tolerance. Eternal exploits the Internet Inter-ORB Protocol (IIOP) interface to ‘‘attach’’ itself transparently to objects operating over a commercial CORBA Object Request Broker (ORB). T...

We construct an eternally inflating spacelike brane world model. This model is feasible only if the space dimension of the brane is three (SM2) or six (SM5) for M theory or four (SD3) for superstring theory. A time-dependent n-form field would supply a constant energy density and cause eternal expansion of the spacelike brane. On the other hand, the hyperbolic space perpendicular to the brane w...

Blass, A. and A. Scedrov, Complete topoi representing models of set theory, Annals of Pure and Applied Logic 57 (1992) l-26. By a model of set theory we mean a Boolean-valued model of Zermelo-Fraenkel set theory allowing atoms (ZFA), which contains a copy of the ordinary universe of (two-valued, pure) sets as a transitive subclass; examples include Scott-Solovay Boolean-valued models and their ...

The huge success of mobile telephone is about to transform ebusiness and the Internet. As a Personal Trusted Device PTD, the mobile phone, will be able to handle secure transactions in a wireless world. The Wireless Application Protocol (WAP) suite enables secure e-commerce services and applications. This paper present an overview of the PKI and the WAP environments and their relation to the In...