The conjecture states that if $A$ is a set of natural numbers and $$\sum_{n\in A}\frac1n=\infty,$$ then $A$ contains arbitratily long arithmetic progressions.
I wonder has it been proved?
The conjecture states that if $A$ is a set of natural numbers and $$\sum_{n\in A}\frac1n=\infty,$$ then $A$ contains arbitratily long arithmetic progressions.
I wonder has it been proved?