In this paper the limiting distribution of the least square estimate for the autoregressive coefficient of a nearly unit root model with GARCH errors is derived
<正>The Whitney immersion theorem asserts that every smooth n-dimensional manifold can be immersed in R2n 1,in particular,smooth surfaces can be immersed in R3,
In this article,we consider endomorphism algebras of direct sums of some local left ideals over a local algebra and give a construction of quasi-hereditary alge