supported by the National Natural Science Foundation of China(No.11271275);the Foundation of the Priority Academic Program Development of Jiangsu Higher Education Institutions。
We provide some exact formulas for the projective dimension and regularity of edge ideals associated to some vertex-weighted oriented cyclic graphs with a common vertex or edge.These formulas axe functions in the weig...
Supported by the National Natural Science Foundation of China(Grant No.11271275);the Natural Science Foundation of Shanghai Municipal(Grant No.13ZR1422500)
We show that for an integral domain or a commutative local ring, it is an L~*-ring if and only if it is an O~*-ring. Some general conditions are also proved for a commutative ring that cannot be L~*.
Partially supported by the National Natural Science Foundation of China (No. 11271275).
Let R be a Noetherian ring, M an Artinian R-module, and p ∈ CosRM. Thencograden. Homn(Rp, M) =-inf{i |πi(p, M) 〉 0} and πi(p, M) 〉 0 =〉 cogradeRpHomR(Rp, M) ≤ i ≤ fdRpHomR(Rp, M),where πi (p,M) i...
supported by National Natural Science Foundation of China (Grant No. 11271275)
Let X be a smooth projective curve of genus g 2 over an algebraically closed field k of characteristic p>0,and F:X→X(1)the relative Frobenius morphism.Let M s X(r,d)(resp.M ss X(r,d))be the moduli space of(resp.semi-...