Abstract:Package managers are legion. Every programming language and operating system has its own solution, each with subtly different semantics for dependency resolution. This fragmentation prevents multilingual projects from expressing precise dependencies across language ecosystems; it leaves external system and hardware dependencies implicit and unversioned; it obscures security vulnerabilities that lie in the full dependency graph. We present the \textit{Package Calculus}, a formalism for dependency resolution that unifies the core semantics of diverse package managers. Through a series of formal reductions, we show how this core is expressive enough to model the diversity that real-world package managers employ in their dependency expression languages. By using the Package Calculus as the intermediate representation of dependencies, we enable translation between distinct package managers and resolution across ecosystems.
于是我决定做一个更完整的横向测评，核心目的只有一个：帮打工人找到一款真正「能用」的日常 PPT 神器。
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「我們以前每個月會外出吃兩次飯，」住在伊朗第二大城市伊斯法罕（Isfahan）的瑪爾珍（Marjan） 說，「現在我們根本不能去了。我們必須把那筆錢省下來付房租。」
Nasa's Artemis 3 aims to send humans to the lunar surface in 2027, but it has faced a series of set-backs and uncertainty around funding.
It is designed to fill the operational gap between simple chroot