This book provides basic knowledge of the mathematical tools use in economic theories. Major contents of this book arise from my lectures given while teaching Mathematical Economics to the Undergraduate and postgraduate students of economics at the department of economics, Aligarh Muslim University, Aligarh. Students over the years have used the material the book contains and the questions they have solved. I would like to thank my colleagues and students for their helpful inputs at various stages of the preparation of this book. I am very grateful also to the editorial and production teams at LAMBERT Academic Publishing GmbH&Co.KG, Germany in finalizing and publishing this book. Last but not the least I shall thank my wife, Shabnam, for her patience and understanding.