Musical chords, harmonies or melodies in Just Intonation have note frequencies which are described by a base frequency multiplied by rational numbers. For any local section, these notes can be converted to some base frequency multiplied by whole positive numbers. The structure of the chord can be analysed mathematically by finding functions which are unchanged upon chord transposition. These fu...

The aim in study was to analyze the characteristics and levels of mathematical communication students solving problems. This used a qualitative descriptive with 6 prospective teacher, 3 from STIKIP Bangkalan teacher Al Hikmah Surabaya, Indonesia. Research data collection techniques through documentation teaching preparation assignments, video recordings during learning obtain verbal communicati...

In this work, we modified a dynamical system that addresses COVID-19 infection under fractal-fractional-order derivative. The model investigates the psychological effects of disease on humans. We establish global and local stability results for aforementioned Additionally, compute fundamental reproduction number, which helps predict transmission in community. Using Carlos Castillo-Chavez method...