An overring Ro of an integral domain R is said to be comparable if Ro≠R, Ro≠qf(R), and each overring of R is comparable to Ro under inclusion. We do provide necessary and sufficient conditions for which R has a comparable overring. Several consequences are derived, specially for minimal overrings, or in the case where the integral closure R¯ of R is a comparable overring, or also when each chain of distinct overrings of R is finite.

中文翻译：

---

什么时候固定环可以与所有覆盖环相媲美？

一个过度R○积分域的R据说是可比的，如果R○≠R,R○≠qF(R)，并且每个覆盖R相当于R○纳入下。我们确实提供了必要和充分条件R具有可比的覆盖率。导出了几个结果，特别是对于最小的overrings，或者在积分闭包的情况下R¯的R是一个可比较的覆盖，或者当每个不同的覆盖链R是有限的。