Ngày tải lên :
06/03/2014, 08:21
... commands InvariantRing,
PrimaryInvariants, and SecondaryInvariants in Magma.) One checks that
R = R/f
1
R is an integral domain.
Let S be the subring of
R generated by f
2
, ,f
6
and g
2
, and ... integers a
1
, ,a
n
such that max
1 i≤n
|a
i
|≤ (1/ 2)(d +1) and
f (a
1
, ,a
n
) =0.
Proof. There are at most d hyperplanes on which f vanishes, which means
that the function g(x
2
, ,x
n
):=f (a
1
,x
2
, ... rings and fields, Ann. of Math.
16 2 (2005), 10 31 10 63.
[3]
———
, The density of of discriminants of quintic rings and fields, Ann. of Math.,to
appear.
[4]
H. Cohen, Constructing and counting number...