How to show it is a regular measure
Be (R, Bl,l) the Lebesgue-measure, y f (element of) L^1 (R,Bl,l). Prove that the measure v: Bl --> [0,\infty
) defined as
v(E) = \int_{E} \! | f | \, dl
is a regular measure.
Hello, @LisaA! This seems to be homework and otherwise not related to SageMath. If I am wrong, please, re-state your question indicating how this is related to Sage, and preferably accompanying with a minimal version of the code you tried in order to solve this problem.