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arXiv 1107.0666cs.LOcs.PL
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无穷项图重写

Infinitary Term Graph Rewriting

Patrick Bahr

摘要:

术语图重写提供了一种通过避免重复以有效方式实现术语重写的形式体系。无穷项重写被用来研究无穷项约简序列。这样的无限约简可以用来推理惰性求值。在本文中,我们结合术语图重写和无限项重写,从而解决懒惰评估的两个组成部分:非严格性和共享。此外,我们展示了我们的理论基础,基于度量空间和一个完整的半格,提供了一个统一的框架,长期重写和长期图重写。这使得研究这两个世界之间的对应关系成为可能。作为一个例子,我们展示了如何健全的长期图重写w.r.t.项重写可以扩展到无穷大设置。

英文摘要:

Term graph rewriting provides a formalism for implementing term rewriting in an efficient manner by avoiding duplication. Infinitary term rewriting has been introduced to study infinite term reduction sequences. Such infinite reductions can be used to reason about lazy evaluation. In this paper, we combine term graph rewriting and infinitary term rewriting thereby addressing both components of lazy evaluation: non-strictness and sharing. Moreover, we show how our theoretical underpinnings, based on a metric space and a complete semilattice, provides a unified framework for both term rewriting and term graph rewriting. This makes it possible to study the correspondences between these two worlds. As an example, we show how the soundness of term graph rewriting w.r.t. term rewriting can be extended to the infinitary setting.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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