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来自维基百科,自由的百科全书
一个自由 -模 是 -模范畴中的自由对象。具体言之,即存在一族元素 (可能有无限多个)使得:
等价说法是:。此时 称作 的一组基底。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.