CAJ | 학술논문

通过证明和反例讨论黎曼积分、直接黎曼积分、黎曼-斯蒂尔切斯积分三者间的联系与区别.结果显示：若函数直接黎曼可积,则它黎曼可积,并且两者积分值相同,但反之不成立;若函数黎曼可积,则任意连续函数关于该函数不一定黎曼-斯蒂尔切斯可积.从讨论结果中还获得直接黎曼可积和黎曼可积各自的一个充分条件.
통과증명화반례토론려만적분、직접려만적분、려만-사체이절사적분삼자간적련계여구별.결과현시：약함수직접려만가적,칙타려만가적,병차량자적분치상동,단반지불성립;약함수려만가적,칙임의련속함수관우해함수불일정려만-사체이절사가적.종토론결과중환획득직접려만가적화려만가적각자적일개충분조건.
In this paper, relations among Riemann integral,directly Riemann integral and Riemann-Stieltjes integral are discussed. With proofs and counter examples, we show that directly Riemann integrable implies Riemann integrable with same value, but the reverse is not true; a continuous function is not necessarily Riemann-Stieltjes integrable with respect to a Riemann integrable function. We obtain also sufficient conditions for directly Riemann integrable and Riemann integrable.