Stephen D. Cohen

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OBJECTIVE We sought to determine the differential rates and complications of hysterectomy type in the year prior to and following the introduction of robotic technology. STUDY DESIGN This was a retrospective chart review of 461 hysterectomies performed from July 2007 through June 2008 (period 1) and July 2008 through June 2009 (period 2) at Virginia(More)
We consider the problem of enumerating the number of irreducible transformation shift registers. We give an asymptotic formula for the number of irreducible transformation shift registers in some special cases. Moreover, we derive a short proof for the exact number of irreducible transformation shift registers of order two using a recent generalization of a(More)
Let E be a finite degree extension over a finite field F = GF(q), G the Galois group of E over F and let a∈F be nonzero. We prove the existence of an element w in E satisfying the following conditions: - w is primitive in E, i.e., w generates the multiplicative group of E (as a module over the ring of integers). - the set {w g ∣g∈G} of conjugates of w under(More)