What is the practical applicability of attribute grammars? As we show in this paper, attribute grammars are at least good enough for the prototyping of fully functional interactive tools. Going from a deenition of a language and the functionality of its tools to an attribute grammar is a discipline in need of a systematic approach, for which we give some initial material. As is inevitable when ...

We prove rigorous lower and upper bounds for the mass gap of the ferromagnetic spin 1/2 XXZ chain. The two bounds coincide asymptotically in the Ising limit ∆ → ∞. Near the isotropic point, ∆ = 1, the estimates are good enough to determine the critical behaviour of the mass gap unambiguously. The derivation does not rely on exact solutions.

We prove rigorous lower and upper bounds for the mass gap of the ferromagnetic spin 1/2 XXZ chain. The two bounds coincide asymptotically in the Ising limit ! 1. Near the isotropic point, = 1, the estimates are good enough to determine the critical behaviour of the mass gap unambiguously. The derivation does not rely on exact solutions.

Implicit in feminist and other critiques of ideal theorizing is a particular view of what normative theory should be like. Although I agree with the rejection of ideal theorizing that oppression theorists (and other theorists of justice) have advocated, the proposed alternative of nonideal theorizing is also problematic. Nonideal theorizing permits one to address oppression by first describing ...

Social phenomena can exhibit drastic changes with small changes in external parameters––phase transitions. Furthermore, physical models can be applied to social systems because most of the small details can be ignored just as in physical systems. Many models have been used and developed, most notable network models. However empirical data and their interpretation are not yet good enough to make...

When faced with making a decision, it is only natural that one would aim to select the course of action which results in the “best" possible outcome. However, the ability to arrive at a decision necessarily depends upon two things: a well-defined notion of what qualities make an outcome desirable, and a previous decision1 defining to what extent it is necessary to characterize the quality of in...

In many practical situations, we need to decide whether a given solution is good enough, based on the degree ai to which different criteria are satisfied. In this paper, we show that natural requirements lead to the weighted average decision, according to which a solution is acceptable if ∑ wi ·ai ≥ t for some weights wi and threshold t. c ⃝2012 World Academic Press, UK. All rights reserved.