Types of discontinuity:
Basically there are two kind of discontinuity.
Removable discontinuity:
If f(x) exists but is not same to f(a), then f(x) has a removable discontinuity at x = a and it may be replaced by redefining f(x) for x = a.
Example: Redefine the function f(x) =[sinx] where x ∈(0,Π) in such a type that it should become continuous for x ∈(0,Π).
Solution: Here = 0 but f(Π/2).
Consequently, f(x) has a removable discontinuity at x = Π/2 .
To replace this we redefine f(x) as follows
f(x) = [sinx], x ∈ (0,Π/2) ∪ (Π/2,Π)
= 0 , x = Π/2.
Now, f(x) is continuous for x ∈(0,Π).
Non-removable discontinuity:
If f(x) does not exist, then we may not replace that discontinuity. So that becomes a non- removable discontinuity or required discontinuity.
Example: Suppose that f (x) = {x} has non removable discontinuity at any x∈I.
Solution: Since f(x) does not exist for any a ∈ I.
Therefore, f(x)= {x} has non-removable discontinuity at any x ∈ I
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