// 单调栈：存储"待匹配更大值"的元素，栈内保持单调递减（核心）
Born in Egypt but raised in the United States, Michael attended Harvard University as an undergraduate and earned a law degree from Stanford. He began his career with a quick stint at Goldman Sachs as an associate in the communications, media, and entertainment investment banking group, before jumping into tech at Tellme Networks in 1999, a voice-recognition company that he helped run before it was acquired by Microsoft in 2007 for roughly $800 million.
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The downsizing follows a week of business updates for eBay. On the same day it shared its latest financial results, the company announced that it would acquire Depop, a consumer-to-consumer secondhand fashion retailer, from Etsy. The Depop purchase carried a $1.2 billion price tag, which could put at least a small dent in the $11.1 billion it reported in 2025 full-year revenue.
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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.