title: Zarhin trick
text: # Zarhin trick
  
  In mathematics, the Zarhin trick is a method for eliminating the polarization of abelian varieties A by observing that the abelian variety $A^4$ × $Â^4$ is principally polarized. The method was introduced by Zarhin (1974) in his proof of the Tate conjecture over global fields of positive characteristic.
  
  