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In many situations, this is the same as considering all partial derivatives simultaneously. The term "total derivative" is primarily used when f is a function of several variables, because when f is a function of a single variable, the total derivative is the same as the ordinary derivative of the function. [1]: 198–203
The gradient is dual to the total derivative: the value of the gradient at a point is a tangent vector – a vector at each point; while the value of the derivative at a point is a cotangent vector – a linear functional on vectors.
Another method of deriving vector and tensor derivative identities is to replace all occurrences of a vector in an algebraic identity by the del operator, provided that no variable occurs both inside and outside the scope of an operator or both inside the scope of one operator in a term and outside the scope of another operator in the same term ...
total derivative, [1] [9] although the material derivative is actually a special case of the total ... In the scalar case ∇φ is simply the gradient of a scalar, ...
6.4 Total derivative, total differential and Jacobian matrix. 7 Generalizations. 8 See also. 9 Notes. 10 References. ... then the gradient is a vector-valued function ...
The second line is obtained using the total derivative, where ∂f /∂∇ρ is a derivative of a scalar with respect to a vector. [ Note 4 ] The third line was obtained by use of a product rule for divergence .
The derivatives of scalars, vectors, and second-order tensors with respect to second-order tensors are of considerable use in continuum mechanics.These derivatives are used in the theories of nonlinear elasticity and plasticity, particularly in the design of algorithms for numerical simulations.
The total derivative with respect to both r and h of the volume intended as scalar function of these two variables is given by the gradient vector ∇ V = ( ∂ V ∂ r , ∂ V ∂ h ) = ( 2 3 π r h , 1 3 π r 2 ) . {\displaystyle \nabla V=\left({\frac {\partial V}{\partial r}},{\frac {\partial V}{\partial h}}\right)=\left({\frac {2}{3}}\pi rh ...