About the Book: Based on the text provided, this book is a translated version of the algebra section of Bhāskarācārya II’s work, Siddhānta-Siromani. It showcases the unique algebraic methods of this exceptionally gifted 12th-century Indian mathematician, who was also a polymath with deep knowledge of astronomy, grammar, and philosophy. The book presents his solutions to various algebraic problems, including those involving surds, indeterminate equations, and the use of zero. It highlights how his work, including a groundbreaking formula for the sine function, expanded the scope of algebra and may be seen as an early precursor to calculus.