Yup. Mind you, you can get OTHER kinds of protections I think – trademarks and such, or if you have a company, you can keep concepts / ideas *from* others outside of it, so that’s a way to profit from it. Plus, any publications (works) are copyrighted by you.
If I had a novel equation or concept, I’d print it up on T-Shirts and sell it at Universities along with a companion book and do a Ted talk or something. Make more $$ that way.
This is a very POWERFUL list of exclusions (things that can’t be patented)
method of operation,
Oh no. Rather it’s that there’s no product to be patented. Patenting is for the potentially realisable physical things .