Introduction:
The first book on the double-entry system was written by an Italian mathematician and Franciscan friar named Luca Pacioli. He is often referred to as the "Father of Accounting" for his significant contributions to the field. Pacioli's book, titled "Summa de Arithmetica, Geometria, Proportioni et Proportionalita," was published in the year 1494.

Luca Pacioli:
Luca Pacioli was born in 1447 in Sansepolcro, Italy. He studied mathematics and was heavily influenced by the works of ancient Greek mathematicians such as Euclid and Archimedes. Pacioli traveled extensively throughout Europe, teaching and collaborating with various scholars.

Publication of "Summa de Arithmetica, Geometria, Proportioni et Proportionalita":
In 1494, Pacioli published his most famous work, "Summa de Arithmetica, Geometria, Proportioni et Proportionalita," which included a section on the double-entry system of bookkeeping. This book played a crucial role in introducing and popularizing the concept of double-entry accounting.

The Content of the Book:
"Summa de Arithmetica, Geometria, Proportioni et Proportionalita" is a comprehensive textbook covering various mathematical topics. The book is divided into five sections:

1. Arithmetic: This section focuses on basic arithmetic operations, including addition, subtraction, multiplication, and division.

2. Algebra: Pacioli introduces algebraic concepts, including equations, proportions, and progressions.

3. Geometry: In this section, Pacioli explores geometric principles, including shapes, measurement, and ratios.

4. Proportions and Proportionalities: Pacioli delves into the concept of proportions and how they relate to various mathematical and real-world scenarios.

5. Accounting: The last section of the book is dedicated to accounting, where Pacioli introduces the double-entry system of bookkeeping. He explains the principles behind recording financial transactions and preparing financial statements.

Impact and Legacy:
Pacioli's book was groundbreaking in the field of accounting. It provided a clear and concise explanation of the double-entry system, which revolutionized the way businesses recorded and tracked financial transactions. The principles outlined in his book are still fundamental to modern accounting practices.

The publication of "Summa de Arithmetica, Geometria, Proportioni et Proportionalita" solidified Pacioli's reputation as a leading mathematician and scholar. His contributions to the field of accounting continue to shape the profession to this day.