The market place has not determined that mathematicians should be paid for results based on formulas they’ve created. Sorry. I have in no way decided math is not a creative endeavor, but you’ve been liberal in creating such an assumption.
And yes, if you have a published work out there in the marketplace, you should receive compensation on the basis of sales as long as you live. Unless you cede that right to another agent of your choosing.
Nor has the marketplace determined that Disney Corp. should be paid in perpetuity, nor even down to the present time, for all derivative works based on the character in “Steamboat Willie”. The latter was decided by political intervention in the marketplace, by passage of a law contrary to the plain spirit of the Constitutional clause granting power to Congress to grant copyrights.
And, the perpetual, inheritable, alienable copyright you advocate cannot be done by the marketplace, but only by state power enforcing a monopoly on behalf of the rightsholder, an exercise of state power, which in the American context is unconstitutional, since Congress is not granted the power to grant exclusive rights to authors and inventors in perpetuity, but only for a limited term.