# Category:Definitions/Orthogonal Curvilinear Coordinates

This category contains definitions related to Orthogonal Curvilinear Coordinates.
Related results can be found in Category:Orthogonal Curvilinear Coordinates.

Let $\tuple {q_1, q_2, q_3}$ denote a set of curvilinear coordinates.

Let the relation between those curvilinear coordinates and Cartesian coordinates be expressed as:

 $\ds x$ $=$ $\ds \map x {q_1, q_2, q_3}$ $\ds y$ $=$ $\ds \map y {q_1, q_2, q_3}$ $\ds z$ $=$ $\ds \map z {q_1, q_2, q_3}$

where $\tuple {x, y, z}$ denotes the Cartesian coordinates.

Let these equations have the property that:

$\dfrac {\partial x} {\partial q_i} \dfrac {\partial x} {\partial q_j} + \dfrac {\partial y} {\partial q_i} \dfrac {\partial y} {\partial q_j} + \dfrac {\partial z} {\partial q_i} \dfrac {\partial z} {\partial q_j} = 0$

wherever $i \ne j$.

Then $\tuple {q_1, q_2, q_3}$ are orthogonal curvilinear coordinates.

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