By Melvin Hochster, C. Huneke
Booklet through Hochster, Melvin, Huneke, C.
Read or Download Phantom Homology PDF
Best science & mathematics books
Ebook by way of Hochster, Melvin, Huneke, C.
- Matrix Mathematics: Theory, Facts, and Formulas, Second Edition
- Term Logic with Choice Operator
- Mathematical Plums
- Barrelledness in Topological and Ordered Vector Spaces
- Algebraische Strukturen [Lecture notes]
- Semi-Inner Products and Applications
Extra info for Phantom Homology
N are sequences of modules and ideals, respectively, and that Mj has c-depth > i on /,- compatibly for 1 < i < j < n. Consider the sequences M * + i , . . ,iVn_jfc and Ji,... , xn-k satisfy the requirement in the definition of compatibility for the new pair of sequences. , Ih for 1 < h < n. e) The compatible c-depth requirement for a pair of sequences is evidently preserved by localization. e. $ *' 5s i < H> then this is true compatibly. We recall from §9 of [HH4] that the function • is defined recursively by D(0) = 1 and D(n + 1) = (D(0) + • • • 4- D(n)) + D(n) + n + 2, n > 1.
Of the Koszul complex K*(TL\ R) into N. ) The 28 MELVIN HOCHSTER AND CRAIG HUNEKE fact that
14) for a discussion concerning complexes of projective modules. Let (G # , a # ) be a complex of finitely generated projective R-modules. 14): however, the ranks may vary with the connected component in the case where Spec(-R) is disconnected and so the additivity condition must be checked locally. If a complex of projectives has the property that Hi(FeG*) is phantom for all i > 1 and all e G N, this condition is also true in each localization. It follows that for each situation where we know that the standard conditions on rank and height (respectively, minheight) must then hold in the free case, we get the same result in the projective case.