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Covariant indices:
    Contravariant indices:
      Einstein sum indices:

        • Input is LaTeX-like (see example), some commands allowed.
        • Identifiers ("tensors" and indices) can be sequences of letter from a to z (lower- or uppercase).
        • Indices must be separated by spaces.
        • Only operators supported are + - and =.
        • Fractions are allowed, indices in the denominator are swapped, meaning $\partial f/\partial x^{i}$ is a (0,1)-tensor.
        • Multiplication is implicit.
        • Sub-/supercript are written with _{indices} and ^{indices}.
        • LaTeX commands can be used in the replacement rule (\alpha, etc.).

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