### Table of Contents

#### Articles

Quadratic Polynomials with Rational Roots and Integer Coefficients in Arithmetic Progression | |

Aniruth Phon-On, Rattikan Saelim | 293-303 |

Weak and Strong Convergence Theorems for Zero Points of Inverse Strongly Monotone Mapping and Fixed Points of Quasi-nonexpansive Mappings in Hilbert Space | |

Buris Tongnoi, Suthep Suantai | 305-319 |

On $n$-Tupled Coincidence and Fixed Point Results in Partially Ordered $G$-Metric Spaces | |

Deepak Singh, Varsha Chauhan, Vishal Joshi, Surjeet Singh Tomar | 321-342 |

On $\varphi$-${\cal T}$-Symmetric ($\varepsilon$)-Para Sasakian Manifolds | |

Punam Gupta | 343-357 |

Generalization of Suzuki's Method on Partial Metric Spaces | |

Esmaeil Nazari | 359-367 |

Study of Prime Graph of a Ring | |

Kishor Pawar, Sandeep Joshi | 369-377 |

Approximating Fixed Points of Nonlinear Mappings in Convex Metric Space | |

Chao Wang | 379-387 |

The Theory of the Feasibility Problems and Fixed Point Problems of Nonlinear Mappings | |

Sirawit Premjitpraphan, Atid Kangtunyakarn | 389-412 |

The Structure of Constacyclic Codes of Length $2p^s$ over Finite Chain Ring | |

Wateekorn Sriwirach, Chakkrid Klin-eam | 413-429 |

Green’s Relations and Natural Partial Order on the Regular Subsemigroup of Transformations Preserving an Equivalence Relation and Fixed a Cross-Section | |

Nares Sawatraksa, Chaiwat Namnak, Kritsada Sangkhanan | 431-444 |

On Convergence Theorems for Two Generalized Nonexpansive Multivalued Mappings in Hyperbolic Spaces | |

Preeyalak Chuadchawna, Ali Farajzadeh, Anchalee Kaewcharoen | 445-461 |

Generalized Hypersubstitutions of Many-Sorted Algebras | |

Dawan Chumpungam, Sorasak Leeratanavalee | 463-473 |

A Modified CQ Algorithm for Solving the Multiple-Sets Split Feasibility Problem and the Fixed Point Problem for Nonexpansive Mappings | |

Suparat Kesornprom, Nattawut Pholasa, Prasit Cholamjiak | 475-493 |

The Viscosity Implicit Midpoint Rule for Finding Common Fixed Points of Two Asymptotically Nonexpansive Mappings with Applications | |

Shrijana Dhakal, Wutiphol Sintunavarat | 495-514 |

A Local Discontinuous Galerkin Method for the Reduced Burgers-Poisson Equation | |

Nattapol Ploymaklam | 515-525 |

On the New Form of the Option Price of the Foreign Currency Related to Black-Scholes Formula | |

Amnuay Kananthai, Somsak Chanaim | 527-538 |

An Elementary Proof of the Brouwer Fixed Point Theorem | |

Sompong Dhompongsa, Poom Kumam | 539-542 |

Fixed Point Theorems for Some Generalized Multi-Valued Nonexpansive Mappings in Hadamard Spaces | |

Chayanit Klangpraphan, Bancha Panyanak | 543-555 |

Quadratic Transformations of Copula Density and Probability Density | |

Pharunyou Chanthorn | 557-570 |

Numerical Solutions to the Rosenau–Kawahara Equation for Shallow Water Waves via Pseudo–Compact Methods | |

Panasun Manorot, Phakdi Charoensawan, Supreedee Dangskul | 571-595 |

**The Thai Journal of Mathematics ***organized and supported by *The Mathematical Association of Thailand and Thailand Research Council and the Center for Promotion of Mathematical Research of Thailand (CEPMART).

**Copyright** 2020 by the Mathematical Association of Thailand.

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|ISSN 1686-0209|