OverLeastCommonDenominator​(AngouriMath.​Entity,​System.​Collections.​Generic.​List{AngouriMath.​Entity})

The expression as one fraction, written the way it is by hand: a sum goes over the
least common multiple of its terms' denominators as they stand, each factor to the
highest power any of them has it and the whole numbers by their least common multiple,
so 1/x + 1/x^2 is (x + 1, x^2) and not (x^2 + x, x^3). Nothing is
factorised to find it: x^2 - 1 and x + 1 share no factor here. Each
denominator that turning a quotient over moves into the numerator is added to
carried, since the expression is undefined where one of those is
zero and the fraction need not be: 1/(1/x) is (x, 1), which has a value
at zero.