Jurnal Riset dan Aplikasi Matematika (JRAM) is a journal published by Universitas Negeri Surabaya periodically in April and October with e-ISSN: 2581-0154.

Manuscripts published in JRAM are the results of research in analysis, algebra, statistics, discrete mathematics, applied mathematics and computational mathematics which has a significant contribution in mathematics and its applications.

JRAM was first published (vol. 1 no. 1) in 2017 with an online version and all processes have been done online.

Journal Editor's Address JRAM, Department of Mathematics FMIPA-UNESA, C8 Building 1st floor, Ketintang, Surabaya 60231, Indonesia, Phone/Fax/WA: +62-31-8297677, Email: jram@unesa.ac.id

Vol. 9 No. 2 (2025): Oktober, JRAM

Published: 27-10-25

FORGOTTEN, HARARY, AND SCHULTZ INDEXES OF PRIME COPRIME GRAPHS OF THE MODULO GROUP OF INTEGER NUMBERS

Muthahira Qalbi, I Gede Adhitya Wisnu Wardhana, I Nengah Suparta, Putu Kartika Dewi

129-137

OPTIMIZING IMPERFECT INVENTORY PROBLEM USING THE ECONOMIC PRODUCTION QUANTITY MODEL

Hidayatul Mayyani; Dinda Ayu Astika, Farida Hanum, Amril Aman

160-169

ANALISIS STABILITAS SISTEM VAN DER POL MENGGUNAKAN METODE RUNGE-KUTTA ORDE 4

Muhammad Imam Al Paqih, Aldiyansyah, Rio Satriyantara

170-178

ANALISIS MODEL PENGUKURAN KINERJA SISTEM ANTRIAN DAN PENGOPTIMALAN WAKTU TUNGGU PADA PEMBUATAN KARTU TANDA PENDUDUK

Herlina B. Onuneng, Djihad Wungguli, La Ode Nashar, Ismail Djakaria, Agusyarif Rezka Nuha, Nisky Imansyah Yahya

219-235

CONNECTIVITY OF COPRIME GRAPHS OVER CYCLIC GROUPS

ARIF MUNANDAR, AMARA NOVI SAFITRI, NABILA RIZQIKA NURHIDAYAT, HAKIM ADIDARMA, JAQUELINE WIDAD ZUHA, RIYANTO

236-243

BILANGAN FIBONACCI BERDASARKAN HIMPUNAN BEBAS GRAF DAYUNG KAYAK

Gede Angga Saputra, Putu Kartika Dewi, I Nengah Suparta

244-254

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