In handwritten mathematics it is common for the sake of clarity to repeat the last mathematical operator in those line breaks that occur in the middle of a formula. I mean something like:
We compute 1 + 2 + 3 + 4 + 5 + + 6 + 7 + 8 to know the answer.
In LaTeX I always do this repetition in displayed environments such as align or multline by manually adding the symbol after the
\\ but this is much more difficult in inline formulas because the breaking point may change during different compilations. In this case I only do it occasionally for the multiplication \cdot. Anyway, this makes my mathematical style not coherent, so I would like to know if there is any package to implement this option.
If you think that this practice is bad I would like to read the reasons.