In mathematics, the Lindelöf hypothesis is a conjecture by Finnish mathematician Ernst Leonard Lindelöf (see Lindelöf (1908)) about the rate of growth of the Riemann zeta function on the critical line. This hypothesis is implied by the Riemann hypothesis. It says that, for any ε > 0, it stated that : zeta(0.5+it)=O(t^ ε) . But The Riemann hypothesis is a well known problem in pure mathematics which it says that " All non trivial zerao of Riemann zeta function lie in the critical strip " , Now my question here is :
What is the hardest to proof :Riemann hypothesis or Lindelöf hypothesis ?