Arithmetic Metamethods

• Metamethods can be defined for:
  • Addition (+) __add
  • Subtraction (-) __sub
  • Multipication (*) __mul
  • Division (/) __div
  • Modulo (%) __mod
  • Exponentiation (^) __exp
  • Negation (unary -) _unm
  • Concatenation (..) __concat
• It might be that some of these operators make no sense in terms of the types involved