Interface SemiRing<T>

A SemiRing instance for T must satisfy these laws:

• Additive is an abelian monoid. The identity of additive is called zero.
• Multiplication is a monoid. The identity of multiplication is called one.
• On multiplication, any element x is left and right annihilated by zero:
  • multiplication.combine(zero, x) = zero,
  • multiplication.combine(x, zero) = zero.