or in some other notation. Very soon the standard formulae for derivatives are
derived and the general notation of limit recedes into the background. When it is
discussed, initially it is usually in a dynamic form:
“f(x) ® c as x ® a,”
or
“f(x) approaches c as x approaches a.”
Later the limit may be given in some quantified form as
“we can make f(x) as close as we like to c provided that we take x
sufficiently close to a,”
or
“for all e > 0, there exists d > 0 such that
0 < |x–a| < d implies |f(x)–c| < e.”
In a similar manner the limit of a sequence is often dealt with briefly then
greater stress is laid on the limit of a series, for instance in the form of a
geometric series
1 + x+Kxn-1 = 1 - xn
1 - x
® 1
1 - x
for |x|