Dr. R. Vijayakumar
Dr. R. Vijayakumar

Asst. Professor (grade II)

Office Address:

MAT 309 Department of Mathematics National Institute of Technology Calicut NIT Campus (P.O)-673601, Kozhikode, Kerala

Contact no:

0495 2285225

Home Address:

  • MSc : Bharathidasan University, Trichy

  • PhD : IIT Madras, Chennai

  • PDEF: IIT Madras, Chennai

  • Educational Qualifications

    • MSc : Bharathidasan University, Trichy

    • PhD : IIT Madras, Chennai

    • PDEF: IIT Madras, Chennai


    • R. Vijayakumar, Note on weighted Bohr’s inequality, Lobachevskii J. Math. 42(12) (2021), 3035–3042.
    • S. Ponnusamy, R. Vijayakumar, Generalized versions of Lipschitz conditions on the modulus of holomorphic functions, C. R. Math. Acad. Sci. Paris, 359(5) (2021), 609–615.
    • S. Ponnusamy, R. Vijayakumar, and K.-J. Wirths, New inequalities for the coefficients of unimodular bounded functions, Results Math. 75, 107 (2020).
    • S. Ponnusamy, R. Vijayakumar, and K.-J. Wirths, Improved Bohr’s phenomenon in quasi-subordination classes, J. Math. Anal. and Appl. 506(1) (2022), 125645, 10 pages.
    • S. Ponnusamy, R. Vijayakumar, and K.-J. Wirths, Modifications of Bohr’s inequality in various settings, Houston J. Math. 47(4)(2021), 807–831.
    •  Sh. Chen, H. Hamada, S. Ponnusamy and R. Vijayakumar, Schwarz type lemmas and their applications in Banach spaces, Journal d’Analyse Mathématique (2023), 36 pages.
    • S. Ponnusamy, R. Vijayakumar, Note on improved Bohr inequality for harmonic mappings, Current Research in Mathematical and Computer Sciences-III, Publisher UWM, Olsztyn (2022), pp. 353–360. See


    • Complex Analysis

    Current Teaching:

    • MA7361-Advanced Complex Analysis (M.Sc. Elective): Winter Semester 2023-24

    • MA1013E-Mathematics II (CE01 Batch): Winter Semester 2023-24

    Past Teaching:

    • MA1001E-Mathematics-I (EE03 and EC04 Batches): Monsoon Semester 2023-24

    • MA8001-Advanced Topics in Mathematics-I(Ph.D. Maths): Monsoon Semester 2023-24

    • MA2002D-Mathematics-IV(PE01 Batch): Winter Semester 2022-23

    • MA8001-Advanced Topics in Mathematics-I(Ph.D. Maths): Winter Semester 2022-23

    • Awarded “The Smt Lakshmikutty Amma and Shri Krishnakutty Nair prize” for the Best Doctoral Thesis Award from the Indian Institute of Technology Madras.
    • Awarded “DST-Inspire Fellowship” in 2016.
    • Awarded “Gold Medal” from Bharathidasan University (One Award made each year for the First rank Holder in the M.Sc., Mathematics Examination of Bharathidasan University).

    • Warden A--Hostel (October 2023 to Till date)
    • Member--Department Purchase and Stocks (February 2023 to Till date)
    • Dept. Seminar Coordinator (February 2023 to Till date)
    • Mathematics I (MA1001E) Course Coordinator (Monsoon Semester 2023)

    • Schwarz  lemmas in  Banach  spaces
    • Bohr-type inequality for various mappings
    • Lipschitz spaces