A Necessary Condition of the Cardinal

In this paper the auther begins with some known results about η_λ(=the least cardinal K such that K→(λ)~<∞), proving this theorem: If λ is not Ramsey cardinal and η_λ exists, then for every a<η_λ there is a weakly compact cardinal γ, such that λ<γ_α<η_λandγ_α<γ_βwhenever a<β<η_λ, therefore η_λ is the limit of the sequence(γ_α:a<η_λ), i.e. η_λ=limγ_α. The theorem is mainly based on the theory of models with indiscernibles.

对“卡夫丁峡谷”问题及其当代意义的再思考

“卡夫丁峡谷”问题是马克思晚年唯物史观中的一个重要内容。本文将立足于对经典文本的解读,结合马克思提出“卡夫丁峡谷”问题的背景,深入探究经典作家有关论述,并结合中国实际进一步阐述“卡夫丁峡谷”问题的当代意义。