feat(QM): Add LinearPMap.sum#1120
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Looks good - approved. will merge shortly.
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Adds to the functionality of unbounded operators:
LinearPMap.sumfor finite sums of partial linear maps. Whilesum fand∑ a, f aare equal, it is not by definition and the latter is difficult to work with.Uis densely defined iffU.closureis densely defined, allowing redundant hypotheses to be removed for essentially self-adjoint operators.