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I'd like to make formal variables that can be multiplied, added etc. but have them labelled by two indices.
Here: https://ask.sagemath.org/question/7925/a-list-of-symbolic-variables/ it's done for variables with one index, and I asked a similar question about defining differential forms with multi-labels here: https://ask.sagemath.org/question/46844/how-to-define-multiple-objects-with-a-for-loop/ I see no clear way of merging these two approaches.