Integral or summation is a branch of mathematics which is in short the opposite method of interdisciplinary or subdivision. A given real variable x and an interval in the number line [ a, b] is a specific integral of the specific function f নির্দিষ্ট \ displaystyle \ int _ {a} ^ {b} \! F (x) \, dx \,} also integral The term may refer to the concept of indefinite integrals. If a given function F is an intersection of function f , then F is called an indefinite integer and is written as: \ displaystyle F = \ int f (x) \, dx.