"Nils Henrik Abel" is a biographical book about the outstanding Norwegian mathematician Nils Henrik Abel, written by the Swedish mathematician Magnus Gustaf Mittag-Leffler. This book traces Abel's life, from his early years and studies to the mathematical achievements that make him one of the greatest mathematicians of the 19th century. The author details the mathematical discoveries, achievements, and difficulties Abel faced, and helps readers better understand his greatness and contribution to the development of mathematics. The book "Niels Henrik Abel" is interesting and informative not only for specialists in the field of mathematics, but also for all lovers of biographies and the history of science.