This book Mathematics-I consisting of Calculus, Differential Equations and Linear Algebra is designed as per AICTE syllabus. Though the book is written for AICTE, it is also suitable to cater various applications in Mathematics including various universities and competitive examinations. This book aims to provide a sound understanding in the subject of Mathematics. Practice is the key word in the learning process of mathematics. The experience of both the author in teaching undergraduate and postgraduate students from diverse background for more than four decades have helped to present the subject in a simplified manner in a step by step approach."