The imaginary number comes in physical world along with physical evolution.
当代物理学的发展是与虚数进入物理世界联系在一起的。
When complex multiplication(CM) is used to create elliptic curves over F_p,the ring of complex quadratic field is only used.
利用虚数乘法(Com p lex M u ltip lication,CM)生成Fp上的椭圆曲线,通常只使用虚二次域的最大整环。