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# Vector and Tensor Analysis in Euclidean Space

• Mikhail Itskov
Chapter
Part of the Mathematical Engineering book series (MATHENGIN)

## Abstract

In the following we consider a vector-valued function $$\varvec{x}\left( t\right)$$ and a tensor-valued function $$\mathbf {A}\left( t\right)$$ of a real variable t. Henceforth, we assume that these functions are continuous such that
\begin{aligned} \lim \limits _{t \rightarrow t_0} \left[ \varvec{x}\left( t \right) - \varvec{x}\left( t_0 \right) \right] = \varvec{ 0 }, \quad \lim \limits _{t \rightarrow t_0} \left[ \mathbf {A}\left( t \right) - \mathbf {A}\left( {t_0 } \right) \right] = \mathbf {0} \end{aligned}
for all $$t_0$$ within the definition domain. The functions $$\varvec{x}\left( t\right)$$ and $$\mathbf {A}\left( t\right)$$ are called differentiable if the following limits
\begin{aligned} \frac{\mathrm{d}\varvec{x}}{\mathrm{d}t} = \lim \limits _{s \rightarrow 0} \frac{\varvec{x}\left( t + s\right) - \varvec{x}\left( t \right) }{s}, \quad \frac{\mathrm{d}\mathbf {A}}{\mathrm{d}t} = \lim \limits _{s \rightarrow 0} \frac{\mathbf {A}\left( t + s \right) - \mathbf {A}\left( t \right) }{s} \end{aligned}
exist and are finite. They are referred to as the derivatives of the vector- and tensor-valued functions $$\varvec{x}\left( t\right)$$ and $$\mathbf {A}\left( t\right)$$, respectively.

## Copyright information

© Springer Nature Switzerland AG 2019

## Authors and Affiliations

1. 1.Department of Continuum MechanicsRWTH Aachen UniversityAachenGermany