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--- Introduction ---
This is an exercise on the definition of continuity
A function f is continuous on a point x0 if
For all , there exists a ,
such that implies .
Given a concret function (who is continuous), a x0
and a , you have to find a
which verifies the above condition. And you will be noted according to
this : more it is close to the best possible value, better
will be your note.