# Question #2872d

A rank-m tensor is a mathematical object that represents ${N}^{m}$ real numbers, where $N$ is the dimension of space.
rank-2 Tensor: represents N^2 real numbers that can be arranged as a $N \setminus \times N$ matrix. Examples of rank-2 tensors are Moment-of-inertia, Riemann Curvature etc.