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Fix LaTeX of free algebras (and repr_lincomb) #14509

@kcrisman

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@kcrisman
sage: K.< alpha,b > = FreeAlgebra(SR)
sage: latex(alpha*b)
\alphab

Someone we are not using repr_lincomb correctly, and in fact that function itself looks pretty hackishly defined. I couldn't even find a very good workaround.

See the first report at ask.sagemath.

See also: #26606 (same problem for power series in one variable).

Depends on #29892

CC: @tscrim @fchapoton @takekoputa

Component: user interface

Keywords: latex

Author: Hoa Nguyen

Branch/Commit: 8d8dd83

Reviewer: Frédéric Chapoton, Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/14509

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