Are you asking an interdisciplinary or two-school subject? Mathematical chemistry is an interdisciplinary subject of mathematics and chemistry, just as physical chemistry is an interdisciplinary subject of chemistry and physics, and geochemistry is an interdisciplinary subject of geology and chemistry. Mathematical chemistry is an interdisciplinary subject developed from computational chemistry and analytical chemistry. It is actually formed by applying mathematical methods in chemistry, and it is calculated and analyzed by mathematical methods. If they are two independent disciplines, mathematics and chemistry are both natural sciences. There are both mathematics, liberal arts and science in high school, and chemistry and science.