An operator is a symbol for an operation upon a function called the object function. The result of the operation is called the resultant function. The basic operator of the differential calculus is the differential operator D and of the integral calculus it is the integral operator D-1.
Proceedings of the Iowa Academy of Science
©1943 Iowa Academy of Science, Inc.
"The Operational Solution of a Linear Homogeneous Differential System,"
Proceedings of the Iowa Academy of Science, 50(1), 279-288.
Available at: https://scholarworks.uni.edu/pias/vol50/iss1/24