For more than three centuries, mathematicians have been using flawed or ill-defined concepts in the development of calculus. As a result, its development peaked in the middle of the 19th century and became so complex, that very little has been realized since then. There is currently a hefty price to pay in terms of calculus education: it has become too difficult to master in any reasonable period of time and would be students shun its study.

A price to pay for the stupidity, incompetence and lethargy of modern era mathematicians.