Solved by Nikronic in post #2 
              
              
                Hi, 
The definition of continutiy: The function  f  is  continuous at some point   c  of its domain if the limit of  f ( x ), as  x  approaches  c  through the domain of  f , exists and is equal to  f ( c ). 
[\lim _{x\to c}{f(x)}=f(c).] 
In detail this means three conditions: first,  f  has to be d…