切削模拟与不可预测性
Cut-Simulation and Impredicativity
摘要:
我们研究了非谓词(高阶)逻辑中的割消除和割模拟。我们说明,添加简单的公理,如莱布尼茨方程的演算不可断言的逻辑-在我们的情况下,一个经典的类型论的微积分-就像添加削减。这一现象同样适用于布尔和函数外延性、归纳、选择和描述等重要公理。这就要求微积分的发展,这些原则是内置的,而不是被公理化处理。
英文摘要:
We investigate cut-elimination and cut-simulation in impredicative (higher-order) logics. We illustrate that adding simple axioms such as Leibniz equations to a calculus for an impredicative logic -- in our case a sequent calculus for classical type theory -- is like adding cut. The phenomenon equally applies to prominent axioms like Boolean- and functional extensionality, induction, choice, and description. This calls for the development of calculi where these principles are built-in instead of being treated axiomatically.
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