Let D be a negative integer congruent to 0 or 1(mod 4)and O=OD be the corresponding order of K=Q(√D).The Hilbert class polynomial HD(x)is the minimal polynomial of the j-invariant jD=j(C/O)of O over K.Let nD=(OQ(jD):Z[jD])denote the index of Z[jD]in the ring of integers OQ(jD)of Q(jD).Suppose p is any prime.We completely determine the factorization of HD(x) in Fp[x]if either p(ł)nD or p(ł)D is inert in K and the p-adic valuation vp(nD)≤3.
关键词
Hilbert类多项式/虚二次序/超奇异椭圆曲线/j-不变量/自同态环
Key words
Hilbert class polynomial/imaginary quadratic order/supersingular elliptic curve/j-invariant/endomorphism ring