The Frobenius theorem and the duality theorem on an Abelian variety
Mieo Nishi · Kyoto journal of mathematics · 1959
L e t A be an abelian v ariety of dim ension n, an d le t X be a div isor on it; th e n the degree v(q),) of the homornorphism T x of A in to its d u al A " is e q u al to [(Xc"))1ni] 2 , w here (X (")) means the n-fold intersection number o f X.