Sagnik Sen

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The clique number of an undirected graphG is the maximum order of a complete subgraph of G and is a well-known lower bound for the chromatic number ofG. Every proper k-coloring of G may be viewed as a homomorphism (an edge-preserving vertex mapping) of G to the complete graph of order k. By considering homomorphisms of oriented graphs (digraphs without(More)
We define and study a class of graphs, called 2-stab interval graphs (2SIG), with boxicity 2 which properly contains the class of interval graphs. A 2SIG is an axesparallel rectangle intersection graph where the rectangles have unit height (that is, length of the side parallel to Y -axis) and intersects either of the two fixed lines, parallel to the X-axis,(More)
PURPOSE To compare the outcomes of torsional phacoemulsification with a new balanced tip (Intrepid) and a conventional tip (Kelman) using a single active-fluidics torsional phacoemulsification machine (Centurion). SETTING Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. DESIGN Prospective(More)