Tensor notation

Object	Computer	Index	Hand-written	Voigt notation
1st order tensor (Vector)	$\underline{\boldsymbol{ u}}$	$u_i$	$\underline{u}$
2nd order tensor	$\boldsymbol{ a}$	$a_{ij}$	$\underset{\sim}{a}$	$\underline{ a}$
4th order tensor	$\textbf{\textsf{ A}}$	$\textsf{ A}_{ ijkl}$	$\underset{\approx}{A}$	$\underline{\underline{\mathsf{ A}}}$

© Knut Andreas Meyer.

Last modified: October 31, 2025.

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