Mobile agents are processes which can autonomously migrate to new hosts. Despite its many practical bene ts, mobile agent technology results in signi cant new security threats frommalicious agentsâ€¦ (More)

We compare the styles of several proof assistants for mathematics. We present Pythagorasâ€™ proof of the irrationality of âˆš 2 both informal and formalized in (1) HOL, (2) Mizar, (3) PVS, (4) Coq, (5)â€¦ (More)

The growing need for risk-based assessments of impacts and adaptation to climate change calls for increased capability in climate projections: the quantification of the likelihood of regionalâ€¦ (More)

This paper presents an algorithm that, given a finite set E of pairs of second-order monadic terms, returns a finite set U(E) of â€˜substitution schemataâ€™ such that a substitution unifies E iff it isâ€¦ (More)

IMPS is an interactive mathematical proof system intended as a general-purpose tool for formulating and applying mathematics in a familiar fashion. The logic of IMPS is based on a version of simpleâ€¦ (More)

Simple type theory, also known as higher-order logic, is a natural extension of first-order logic which is simple, elegant, highly expressive, and practical. This paper surveys the virtues of simpleâ€¦ (More)