抢人才“帽子工程”助长学术泡沫 学者痛陈浮躁

See also: Vopěnka's alternative set theory

百度 雨是耕夫的欢喜，却可能是诗人的忧伤上世纪二十年代，一个22岁的青年，撑着油纸伞，独自彷徨在江南《雨巷》，他希望逢着一个丁香一样结着愁怨的姑娘。

In mathematical logic, an alternative set theory is any of the alternative mathematical approaches to the concept of set and any alternative to the de facto standard set theory described in axiomatic set theory by the axioms of Zermelo–Fraenkel set theory.

Alternative set theories

Alternative set theories include:

• Vopěnka's alternative set theory
• Von Neumann–Bernays–G?del set theory
• Morse–Kelley set theory
• Tarski–Grothendieck set theory
• Ackermann set theory
• Type theory
• New Foundations
• Positive set theory
• Internal set theory
• Pocket set theory
• Naive set theory
• S (set theory)
• Double extension set theory
• Kripke–Platek set theory
• Kripke–Platek set theory with urelements
• Scott–Potter set theory
• Constructive set theory
• Zermelo set theory
• General set theory
• Mac Lane set theory

See also

• Non-well-founded set theory
• List of first-order theories § Set theories