Nationality Indian Name K. Nag Ethnicity Bengali Role Author | Citizenship Indian Genre Mathematician | |

Occupation Mathematician, School Teacher of Mitra Institution and writer of many Mathematics books. Spouse Laxmimani Debi or Lakkhimani Debi Literary movement Indian independence movement Died 6 February 1987 (aged 93) Kolkata, West Bengal, India Born 10 August 1893 (age 93), Gurap, Hooghly, Bengal, British India Similar Srinivasa Ramanujan, Satyendra Nath Bose, D R Kaprekar |

**Keshab Chandra Nag** or **K.C. Nag** Bengali **কেশবচন্দ্র নাগ** (10 July 1893 – 6 February 1987), was a Bengali mathematics textbook author and educator.

## Contents

- Early life
- Education
- Working life
- Meeting with Ashutosh Mukhopadhay
- Mathematics books
- Others
- Death
- References

## Early life

K. C. Nag was born in Gurap, Nagpara Hooghly, Bengal, British India on the holy day of Rath Yatra, 10 July 1893. His Father was Raghunath Nag and Mother Khiroda Sundari Debi. Nag lost his father in early age. He was only cared for by his mother.

## Education

Keshab Chandra Nag started his education in a Bengali Medium School at his Village Gurap. At that time that was the only school at Gurap. From Class VII he changed his school to Bhastara Yojgeshshar Uccha Vidyalaya (Yojgeshshar High School), 3 miles from his village. He would start walking early in the morning to reach his school and came back home at evening every day. In Class IX he got admitted to Kishenganj High School. In 1912, he passed the entrance examination with a First Class and joined Ripon College (now [Surendranath College]), Kolkata, in Science. In 1914, he passed the I.Sc examination with a First Class.

## Working life

He started his career as Third Master in Bhastara Yojgeshshar Uccha Vidyalaya. He also did private tuitions when teaching there. His family was dependent on him but he resigned from his job to pursue higher studies, but not with Science. He tried to Graduate in Arts, Mathematics and Sanskrit. He passed B.A. and received a job offer from Kishenganj High School as Mathematics Teacher. He taught for some time in that School, after which he got another offer from Baharampur Krishnanath Collegiate School join the school as a mathematics teacher. At first he lived in a mess at Rosa Roadin Kolkata. From 1964 he started to live at his own house at Gobinda Ghoshal Lane in South Kolkata.

## Meeting with Ashutosh Mukhopadhay

At that time Sir Ashutosh Mukhopadhay heard about him, and he took him to Mitra Institution, Bhabanipur as a mathematics teacher.

## Mathematics books

Kabisekhar Kalidas Roy was a colleague of Keshab Chandra Nag. His first book was *Nava Patiganit* from U.N. Dhar & Sons. Within a short time, this book became famous among the students of class five and six. In the year 1942 *Matric Mathematics*, one of the famous books of K.C. Nag was published by the publisher Calcutta Book House with the help of Pareshchandra Bhawal. With time his mathematics text books became more popular among the teachers and students. When the popularity of his mathematics books increased, his younger son Late Taraprasad Nag started his own publishing house named "Nag Book House". This publishing house has now been renamed as " Nag Publishing House" and is managed by his grand son Sri Tridibesh Nag. Tridibesh did his B.E. in electrical engineering and M.E from Jadavpur University. After this he took over the publication and took every measure to ensure that the mathematics books by the legendary K.C.Nag never lost its reputation. His sole motive was to see to it that the students are not deprived from the privilege of learning mathematics from K.C.Nag's maths books. K.C.Nag's books from class 4–12 are the books which the students aspiring to excel in every walk of life had depended on at some time or other for the past three generations. Tridibesh formed a board consisting of eminent professors,school teachers, examiners and successful students in order to revise the book from time to time. The proceeds of the sales of his books are mainly donated to two charity funds- one in his own name and the other one is on behalf of his wife Lakkhimani.

## Others

Keshab Chandra Nag was a disciple of Ma Sarada Devi. From 1925 to 1980 he wrote his diary named *Ratna Bedi*. It contained many poems, songs, and jokes. He also took part in the Freedom Movement. He went to jail after participating in Mahatma Gandhi's "Bharat Choro" movement. He was very much interested in sports. He was a lifetime member of Mohanbagan Club.

## Death

He died on 6 February 1987.