On the regular elements in Zn     Regular elements  Eular's phi-function  von Neumann regular rings       font style='font-size:12px;'> 2010/2/25

All rings are assumed to be finite commutative with identity element. An element a \in R is called a regular element if there exists b \in R such that a=a2b, the element b is called a von Neumann inve...

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Tangent Lines of Generalized Regular Curves Parametrized by Time Scales     Time scale  delta derivative  generalized regular curve  tangent line       font style='font-size:12px;'> 2010/3/1

In this paper a generalization of the notion of regular curve is introduced. For such curves the concept of tangent line is investigated.

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