Bi-concave functions involving a differential operator


ALTINKAYA Ş., YALÇIN TOKGÖZ S.

Journal of Mathematical Extension, cilt.13, sa.2, ss.111-122, 2019 (ESCI) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Sayı: 2
  • Basım Tarihi: 2019
  • Dergi Adı: Journal of Mathematical Extension
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI)
  • Sayfa Sayıları: ss.111-122
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

The purpose of the present paper is to introduce a class (D lambda,delta C0)-C-k,alpha(beta) of bi-concave functions defined by a differential operator. We find estimates on the Taylor-Maclaurin coefficients vertical bar a(2)vertical bar and vertical bar a(3)vertical bar for functions in this class. Several consequences of these results are also pointed out in the form of corollaries.