exp(-1/x^2)

There are infinitely many other such functions.

This tells us why Taylor Series are a more limited device than they might be. We form a Taylor series by looking at the derivatives of a function at a given point; but this example shows us that the derivatives at a point may tell us almost nothing about its behavior away from that point.

lib/DbaDatabase.php:134: Warning: dba_replace() [<a href='function.dba-replace'>function.dba-replace</a>]: You cannot perform a modification to a database without proper access