We propose a parity-time (PT) symmetric fiber laser composed of two coupled ring cavities with gains and losses, which o......

Let R be a finite commutative ring with identity and τ be a nonnegative integer. In studying linear finite automata, on......

本文利用特征模给出了Ｎｏｅｔｈｅｒ环的一些充分必要条件，并由此讨论了Ｎｏｅｔｈｅｒ环上的内射模与平坦模型的一些性质。......

本文研究了商环Ｒ／Ｉ的Ｋ０群，证明了：设Ｒ／Ｉ∈ＰＴ，Ｉ∈Ｊ（Ｒ），则Ｋ０Ｒ≈Ｋ０（Ｒ／Ｉ）当且仅当幂等元关于Ｉ可提升。并进而给出了Ｅｘｃｈａｎｇｅ环的一个特征。......

The headlines could make any forecaster’s head spin:"Millennials Can’t Afford to Buy Homes or Have Kids.""Millennials ......