masterpieces of analysis in the twentieth century")。1949年,冯诺依曼又提出了直积分(英语:directintegral)的概念。 测度论的目的是为各种不规则物体的长度、面积、体积等概念建立严格化的理论基础,并将其推广到比欧几里德空间更抽象的空间中。20
Gärtner J. Targeting elements in the amino-terminal part direct the human 70-kDa peroxisomal integral membrane protein (PMP70) to peroxisomes. Biochem. Biophys
McGraw-Hill, 1987, ISBN 978-0-07-100276-9 . Saks, Stanisław, Theory of the integral 2nd Dover, Dover, 2005, ISBN 978-0-486-44648-6 ; originally published Monografje