Higher Dimensional Triangular and Square Numbers

Abstract

Triangular numbers and square numbers are traditionally defined in two-dimensional space. In this paper, we generalize these numbers to higher dimensions and explore their properties using a coordinate system to conceptualize spaces beyond three dimensions. By generalizing triangular numbers, we establish and prove a notable combinatorial identity and recursive relationship between triangular numbers of different dimensions. Key applications discussed include network optimization and geometric partitioning. The paper concludes by finding the ratio between generalized triangular and square numbers, which geometrically corresponds to the volume ratio of a tetrahedron to a d-dimensional cube.