Zen Group of Western Australia Zen Group of Western Australia The Zen Group of Western Australia (ZGWA) is an organization of lay zen practitioners located in Perth, Western Australia. The ZGWA is formally affiliated with the Diamond Sangha tradition of Zen Buddhism, which was founded in Hawaii in 1959 by Robert Aitken Roshi. In keeping with Diamond Sangha tradition, the ZGWA uses rituals from both the Soto and Rinzai schools. Mediation practices of Shikantaza from the Sōtō school and koan training from the Rinzai school are typical forms of practise employed by students in the group, under the guidance of the groups roshi. ZGWA's senior
Defeasible reasoning in part because proponents of informal logic became the keepers of argument and rhetoric while insisting that formalism was anathema to argument. About this time, researchers in artificial intelligence became interested in non-monotonic reasoning and its semantics. With philosophers such as Pollock and Donald Nute (e.g., defeasible logic), dozens of computer scientists and logicians produced complex systems of defeasible reasoning between 1980 and 2000. No single system of defeasible reasoning would emerge in the same way that Quine's system of logic became a de facto standard. Nevertheless, the 100-year headstart on non-demonstrative logical calculi, due to George Boole, Charles Sanders