# 張量

${\displaystyle {\begin{bmatrix}a_{11}&a_{12}&a_{13}\\a_{21}&a_{22}&a_{23}\\\end{bmatrix}}}$

${\displaystyle {\begin{bmatrix}\sigma _{11}&\sigma _{21}&\sigma _{31}\\\sigma _{12}&\sigma _{22}&\sigma _{32}\\\sigma _{13}&\sigma _{23}&\sigma _{33}\\\end{bmatrix}}}$

## 攷

1. Ray M. Bowen and C. C. Wang (1976). Introduction to Vectors and Tensors, Vol 1: Linear and Multilinear Algebra. New York, NY.: Plenum Press.