在抽象代數中，有序環是一個（通常是交換的）環R，存在全序≤，使得對於R中的所有a、b和c：[1]
如果a ≤ b，則a + c ≤ b + c。 如果0 ≤ a和0 ≤ b，那麼0 ≤ ab。
參考文獻
Wikiwand in your browser!
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.
