Number Theory and Its Applications in China by Wang Y., Pan C.B. (eds.)

By Wang Y., Pan C.B. (eds.)

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D + e)! F (xK )G(xL ) (K,L)∈sh(d,e) . p The rest of the proof is an approximation argument. Consider the discretization i/n , i = 1, . . , n of [0, 1] ; given continuous F , G on [0, 1]d and [0, 1]e , we approximate F , G by step functions as above and construct corresponding polynomials f , g . As n → ∞ , these functions are dense in Lp ([0, 1]d ) and Lp ([0, 1]e ) . 9. The constant c2 (d, e) is c2 (d, e) = d+e d 1/2 . 7. Then 2 F (xK )G(xL ) = 2 (K,L)∈sh(d,e) (K , L )∈sh(d , e ) (K , L )∈sh(d , e ) [0,1]d +e F (xK )G(xL ) F (xK )G(xL ) dx and this is equal to d+e d F 2 2 G 2 2 + (K,L)=(K ,L ) [0,1]d +e F (xK )G(xL ) F (xK )G(xL ) dx.

Choose j ∈ {0, . . , n} such that xj |ϕ(X ) = 0 . Then the vector (f0 , . . , fn ) is proportional to (ϕ∗ x0 /ϕ∗ xj , . . , ϕ∗ xn /ϕ∗ xj ) ∈ K(X)n+1 and we may assume that they are equal. ,n Z where the sums range over all prime divisors Z of X . By the valuative criterion of properness (cf. 10), the domain U of ϕ has a complement of codimension at least 2 . 7. By choosing a trivialization of (ϕ|U )∗ OPn (1) at a generic point of Z , we may view ϕ∗ (xi ) as regular functions in Z . ,n and thus ordZ (ϕ∗ xj ) deg Z.

The global height hλ is independent of the choices of F and of the section s . 7, the global height is independent of F . Its independence from the choice of s can be verified as follows. Let t be another non-zero meromorphic section of O(D) with P ∈ / supp(D(t)). 5 show that λD(s) (P, v) − λD(t) (P, v) = λs/t (P, v) for any v ∈ MF . On the other hand, the product formula shows that the global height of P relative to λs/t is 0, proving the claim. 5. As an immediate consequence the global height relative to the natural local height of a non-zero rational function is identically 0.

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