谓词Transformers、(co)Monads和归结
Predicate Transformers, (co)Monads and Resolutions
摘要:
这篇简短的笔记包含了关于幂集上闭包/内部运算符的因式分解定理的随机想法,这让人想起单子/共单子的分解概念。这个问题起源于形式拓扑学,但本身很有趣。结果建设性地保持(即使它经典地有几个变化);但通常不是谓词性的(在这个意义上,插值不会由一个集合给出)。对于那些不熟悉预测性问题的人,我们来看看一个“经典”版本,其中我们限制了插值的大小。
英文摘要:
This short note contains random thoughts about a factorization theorem for closure/interior operators on a powerset which is reminiscent to the notion of resolution for a monad/comonad. The question originated from formal topology but is interesting in itself. The result holds constructively (even if it classically has several variations); but usually not predicatively (in the sense that the interpolant will no be given by a set). For those not familiar with predicativity issues, we look at a ``classical'' version where we bound the size of the interpolant.
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