Welcome to my web page!!! My name is Andriaherimanana Sarobidy Razafimahatratra (call me Bidy), I am a PhD student in discrete mathematics at the University of Regina. I am also an alumnus of the University of Antananarivo, the African Institute for Mathematical Sciences(AIMS-Ghana) and Moscow Insitute of Physics and Technology (MIPT). This web page is dedicated to my research and other interesting things in mathematics.
My mathematical interest lies in the field of discrete mathematics, especially in graph theory. My thesis at AIMS was about Symmetry Breaking in Graphs . The main objective of this thesis was the study of the distinguishing and determining number of certain classes of graphs. Given a graph $G=(V,E)$, an $r$-labeling of $G$ is a map that assigns to each vertex of $G$ an integer from the set $\{1,\ldots,r\}$. An $r$-labeling of $G$ is said to be distinguishing if the only automorphism of $G$ preserving the label is the trivial automorphism. The distinguishing number of $G$ is the minimum size of a distinguishing labeling. A subset $S$ of $G$ is said to be a determining set if the automorphisms of $G$ are uniquely defined by their actions on $S$. The determining number of $G$ in this case is the minimum size of a determining set.
I am currently doing my research under the supervision of Dr. Fallat and Dr. Meagher.