Es seien I = [ a , b ] {\displaystyle {}I=[a,b]} und J = [ c , d ] {\displaystyle {}J=[c,d]} reelle Intervalle und es seien μ I {\displaystyle {}\mu _{I}} bzw. μ J {\displaystyle {}\mu _{J}}
![{\displaystyle {}I=[a,b]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d9415455379ef65b8bcc5629a5e182b7e8909e52)
![{\displaystyle {}J=[c,d]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/625f30a54af64c7fa655cf4915f6bd9b3a1f1a5d)
