Home | 18.022 | Chapter 5 | Section 5.2

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t which appears here is neither a scalar nor a vector; it is a sort of double vector, in that it has 9 components each component of t having 3 components, one for each component of .
Entities of this sort are called second rank tensors.
The construct (t) t occurring here is a vector; its first component, for example,  is .