Theory of the integral

Abstract: The integral is an abstract space - mcaratheodory measure - functions of bounded variation and the lebesguestieltjes integral - derivation of additive functions of a set and of an interval - area of a surface - major and minor functions - functions of generalized bounded variation - denjoy integrals - derivates of functions of one or two real variables - on haar's measure - the lebesgue integral in abstract spaces.