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That is a leftover from Maxima's translation back to Sage. Somehow it didn't get translated. Looking at the precise expression hs, I suspect probably _SAGE_VAR_(0) is what came out of omega^R + 1, which then becomes zero - but a symbolic zero. So we are probably missing a translation in series (or in general) when a symbolic zero is brought back from Maxima. I don't have a solution for that but those with time in the know should be able to get it from that.

That is a leftover from Maxima's translation back to Sage. Somehow it didn't get translated. Looking at the precise expression hs, I suspect probably _SAGE_VAR_(0) is what came out of omega^R + 1, which then becomes zero - but a symbolic zero. So we are probably missing a translation in series (or in general) when a symbolic zero is brought back from Maxima. I don't have a solution for that but those with time in the know should be able to get it from that.