 The known lower bound, due to Elekes 2 , is C _{SzTr} \ge 2^{-2/3} = 0.63.
<clarity>  The known lower bound, due to Elekes 2 , is C _{SzTr} \ge 2^{-2/3} = 0.63.
 The known lower bound, due to Elekes , is C _{SzTr} \ge 2^{-2/3} = 0.63.