This volume contains a valuable collection of research articles by active and well-known mathematicians in differential geometry and mathematical physics, contributed to mark Professor Kouei Sekigawa's 60th birthday. The papers feature many new and significant results while also reviewing developments in the field. The illustrious career of Professor Sekigawa and his encounters with friends in mathematics is a special highlight of the volume.

This volume consists of contributions by the main participants of the 3rd International Colloquium on Differential Geometry and its Related Fields (ICDG2012), which was held in Veliko Tarnovo, Bulgaria. Readers will find original papers by specialists and well-organized reports of recent development in the fields of differential geometry, complex analysis, information geometry, mathematical physics and even coding theory. This volume provides significant information regarding recent progress in these fields that will be useful to researchers and a good guide for young scientists. It is also...