I want to make a system of linear equations in LaTeX and I'm using systeme for that. The problem is that I want indices to be superscripted like this:

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because that's the notation we use. Yet systeme uses bottom indexing and if I try to do that it gives an error:

\systeme{x^1 + x^2 + x^3 = 1}

Package systeme Error: l'inconnue "x_{-1}" a deja ete trouvee dans l'equation !.

Is there any workaround?

  • 1
    can you supply an example document so people can test answers? (add it to the question in a code block, {} in the editor) Sep 21 '16 at 10:46

Use the command \syssubstitute (to be found in the systeme documentation), like this:

\systeme{x_1 + x_2 + x_3 = 1}

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