Mathematics (IP)

The world has been divided many times.
There is an entire calculus devoted to it: take the integral
of religion, or the derivative of war. Show your work.

The dead know only arithmetic, the unkind subtraction
of life minus one. The result is not zero, but unity.
The dead are all the same. The postulate can be derived from Euclid.

Sometimes, the heart may learn addition.
The product of two is in this case indivisible.
This theorem remains unproven.

(Inspiration point: divide the world.)