Why does a table of values not prove a limit?
Why does the method of a table of values only provide a reasonable guess and not proof of the limit value?
- θ βяιαη θLv 78 years agoFavorite Answer
A table of values of f(x) around x = a does just that: it gives a list of values around that x = a. In order to show prove the value of lim (x-->a) f(x), we can get as close as we want to its value by restricting x to a sufficiently small neighborhood around x = a (this gives rise to the epslion-delta definition of a limit). A table of values around x = a gives us several of these neighborhoods, but in order to prove the value of the limit, we need to check all possible neighborhoods, something that a table of values cannot do.
I hope this helps!
- δοτζοLv 78 years ago
Proofs require the definition.