limits
Annoyed about how the textbook from which I'm teaching calculus implicitly quantifies over the reals when it defines limits. Instead of quantifying over the domain. Also instead of being explicit about anything.
(So sqrt(x) only has a right-sided limit at 0, not a limit.)
It might be the right thing to do (I'm not sure), but it's still annoying.
(So sqrt(x) only has a right-sided limit at 0, not a limit.)
It might be the right thing to do (I'm not sure), but it's still annoying.