> Objectively, a great majority of people can live their lives without even thinking about or performing calculus OK no argument there. The OP statement was "F

> Objectively, a great majority of people can live their lives without even thinking about or performing calculus OK no argument there. The OP statement was "For example ... Calculus for solving all sorts of problems" so it appeared you were taking issue with the idea that Calculus can be used to solve all sorts of problems. Your argument is clearer now: even if Calculus can be used to solve all sorts of problems that doesn't mean that it is "fundamental knowledge" for most people.