Advanced methods of crystalographyedited by G. N. Ramachandran

Remembrances of Professor G . N . Ramachandran

Remembrances of Professor G . N . Ramachandran ( 1922 – 2001

Editor’s note: Few scientists contribute an idea of such clarity and power that it appears in all the discipline’s textbooks and bears the author’s name. For the contribution to be relevant and universally employed almost forty years after it first appeared is even less common. Structural biology lost the author of such an idea with the death of G.N. Ramachandran, whose picture appears on the c...

Richardson and Chebyshev Iterative Methods by Using G-frames

In this paper, we design some iterative schemes for solving operator equation $ Lu=f $, where $ L:Hrightarrow H $ is a bounded, invertible and self-adjoint operator on a separable Hilbert space $ H $. In this concern,  Richardson and Chebyshev iterative methods are two outstanding as well as long-standing ones. They can be implemented in different ways via different concepts.In this paper...

review of radiographic methods in dental implantology

چکیده ندارد.

On the Finite Groupoid G(n)

In this paper we study the existence of commuting regular elements, verifying the notion left (right) commuting regular elements and its properties in the groupoid G(n). Also we show that G(n) contains commuting regular subsemigroup and give a necessary and sufficient condition for the groupoid G(n) to be commuting regular.