Downward density of exact degrees
J. Liu, Guohua Wu, Mars M. Yamaleev · Lobachevskii Journal of Mathematics · 2015
In this paper we study exact d.c.e. degrees, the class of d.c.e. degrees which is strictly between the class of degrees of tops of bubbles and the class of isolated d.c.e. degrees.We show that exact degrees are downward dense similar to isolated d.c.e. degrees.