Please help with this part:

$($e$)$ static MathVector add$($MathVector$...)$ should behave like

static MathVector add$($MathVector$,$ MathVector$)$

except it should allow the addition of an arbitrary number of vectors.

$$ It is simplest to start with a vector of zeros, and keep shifting by the vectors you$$re supposed to be adding.

$$ The sum of no vectors can be new MathVector$(0)$ although I won$$t test this case.