Important: The tensor package has been deprecated. Use the superseding commands DifferentialGeometry[evalDG] and Physics[Define] instead.
Create a 2-tensor of mixed character with components stored in the array "cmpts".
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Create a zero-rank tensor with "component" arctan(y/x).
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Create a 2-tensor of mixed character by directly entering the components.
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Create the contravariant Euclidean 3-space metric (2-tensor) in spherical-polar coordinates.
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