I'm starting to study the basics of measure theory and found interesting this problem: Let us define

Pitrellais

Pitrellais

Answered question

2022-05-27

I'm starting to study the basics of measure theory and found interesting this problem: Let us define | E | = 1 E ( x ) d x, where E R and 1 E its characteristic function. Given A B R , with | A | = a < b = | B | and x ( a , b ), is it possible to find A X B such that |X|=x? Any ideas? Can I say this is an analogue of the Intermediate value theorem for the function | | ?

Answer & Explanation

Tristan Ward

Tristan Ward

Beginner2022-05-28Added 8 answers

Let φ ( x ) = | A ( B ( , x ) ) | for x R , then φ is continuous and φ ( x ) | B | as x and φ ( x ) | A | as x . Now Given | A | < α < | B | , by IVT we have some φ ( c ) = α and A ( B ( , c ) ) B.

Do you have a similar question?

Recalculate according to your conditions!

Ask your question.
Get an expert answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?