A tensor is a mathematical object. Tensors provide a mathematical framework for solving physics problems in areas such as elasticity, fluid mechanics and general relativity. The word tensor comes from the Latin word tendere meaning "to stretch".
A tensor of order zero (zeroth-order tensor) is a scalar (simple number). A tensor of order one (first-order tensor) is a linear map that maps every vector into a scalar. A vector is a tensor of order one. A tensor of order two (second-order tensor) is a linear map that maps every vector into a vector (e.g. a matrix).
- Einstein field equations, where tensor is used
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- Danielson, D. A. (1997). Vectors and Tensors in Engineering and Physics (Second ed.). Reading, Massachusetts: Addison-Wesley. p. 17. ISBN 0-201-44210-8.
- "Comprehensive List of Algebra Symbols". Math Vault. 2020-03-25. Retrieved 2020-09-07.
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