Y by wiseman, a-shi2213, Mathuzb, Adventure10
Given a set
of natural numbers in which for all
we have
, call a real number
good if there exists
such that
. Also a subset of
is called compact if the average of its elements is a good number.
Prove that at least
subsets of
are compact.
Proposed by Mahyar Sefidgaran







Prove that at least


Proposed by Mahyar Sefidgaran
This post has been edited 1 time. Last edited by TheOverlord, Jul 23, 2016, 3:29 PM
Reason: proposer added
Reason: proposer added