sumThread

◼ sumThread[exprs, {indexes}] threads sum over the list of expressions in the first argument.

◼ See also: sum.

Further examples

Load sneg and declare some quantities.

<< sneg`sneg`;
snegfermionoperators[c]

sum[{number[c[k], UP], 
        number[c[k], DO]}, {k}]
sumThread[%]