**About this Journal**

The Korean Journal of Mathematics (KJM) is the official journal of The Kangwon-Kyungki Mathematical Society (KKMS). Abbreviated title is "Korean J. Math.". This journal was launched in 1993. One volume is published each year, and each volume consists of four issues (March, June, September, December).

**Bibliographic Information**

ISSN: 1976-8605 (Print)

ISSN: 2288-1433 (Online)

doi: 10.11568/kjm

**If you have any question, please contact us.**

### Vol 27, No 2 (2019)

### Table of Contents

#### Articles

Magnifying elements in a semigroup of transformations preserving equivalence relation | |

Thananya Kaewnoi, Montakarn Petapirak, Ronnason Chinram | 269-277 |

On new inequalities of Simpson's type for generalized convex functions | |

Mehmet Zeki Sarıkaya, Huseyin Budak, Samet Erden | 279-295 |

A new mapping for finding a common solution of split generalized equilibrium problem, variational inequality problem and fixed point problem | |

Mohammad Farid, Kaleem Raza Kazmi | 297-327 |

$L-$fuzzy semi-prime ideals in universal algebras | |

Berhanu Assaye Alaba, Gezahagne Mulat Addis | 329-342 |

A fixed point approach to the stability of a quadratic-cubic functional equation | |

Yang-Hi Lee | 343-355 |

$k-$fractional integral inequalities for $(h-m)-$convex functions via Caputo $k-$fractional derivatives | |

Lakshmi Narayan Mishra, Qurat Ul Ain, Ghulam Farid, Atiq Ur Rehman | 357-374 |

Matrix operators on function-valued function spaces | |

Sing-Cheong Ong, Jitti Rakbud, Titarii Wootijirattikal | 375-415 |

Simplifying coefficients in a family of ordinary differential equations related to the generating function of the Mittag--Leffler polynomials | |

Feng Qi | 417-423 |

A note on multipliers in almost distributive lattices | |

Kyung Ho Kim | 425-435 |

Characterizing functions fixed by a weighted Berezin transform in the bidisc | |

Jaesung Lee | 437-444 |

A Banach algebra of series of functions over paths | |

Dong Hyun Cho, Mo A Kwon | 445-463 |

Irreducibility of Hurwitz polynomials over the ring of integers | |

Dong Yeol Oh, Ye Lim Seo | 465-474 |

$L$-fuzzy bi-closure systems and $L$-fuzzy bi-closure operators | |

Jung Mi Ko, Yong Chan Kim | 475-485 |

Certain results involving fractional operators and special functions | |

Arman Aghili | 487-503 |

On estimation of uniform convergence of analytic functions by $(p,q)$-Bernstein operators | |

M. Mursaleen, Faisal Khan, Mohd Saif, Abdul Hakim Khan | 505-514 |

Solvability of Sylvester operator equation with bounded subnormal operators in Hilbert spaces | |

Hariz Bekkar Lourabi, Mansour Abdelouahab | 515-523 |

The chromatic polynomial for cycle graphs | |

Jonghyeon Lee, Heesung Shin | 525-534 |

Crossed semimodules and cat$^{\bf 1}$-monoids | |

Sedat Temel | 535-545 |

Monodromy groupoid of a local topological group-groupoid | |

Hürmet Fulya Akız | 547-562 |

ISSN: 1976-8605 (Print), 2288-1433 (Online)

Copyright(c) 2013 By The Kangwon-Kyungki Mathematical Society, Department of Mathematics, Kangwon National University Chuncheon 21341, Korea Fax: +82-33-259-5662 E-mail: kkms@kangwon.ac.kr