fluxion

defmodule Fluxion.Function do
  @moduledoc """
  An Elixir behaviour for a mathematical function definition and it's
  derivative.
  """

  @type t() :: module()

  @doc "evaluate the function f(x) at x"
  @callback f(number) :: number

  @doc "evaluate f'(x) at x"
  @callback dfdx(number) :: number
end