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Proper integral is a kind of integral in Integral calculus, a branch of Mathematics in Calculus .
A integral with finite value of Limit of a function and whose value does not approach to infinity.     
is finite and
Every integral whose value is finite is not proper integral until the limit existence is ensured. 
Limit existence is possible when the limit at right and left neighborhood is equal to limit itself. This condition ensures the integral to be proper integral.
It has Properties of addition and subtraction