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We prove that Grothendieck's Hodge standard conjecture holds for abelian varieties in arbitrary characteristic if the Hodge conjecture holds for complex abelian varieties of CM-type. For abelian varieties with no exotic algebraic classes, we prove the Hodge standard conjecture unconditionally. Introduction. In examining Weil's proofs (Weil 1948) of the Riemann hypothesis for curves and abelian varieties over finite fields, Grothendieck was led to state two "standard" conjectures (Grothendieckdoi:10.2307/3062126 fatcat:4i7ilazy3nfzves2au62awx3gy