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- Adiprasito, Karim, et al.
(författare)
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Connectivity of pseudomanifold graphs from an algebraic point of view
- 2015
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Ingår i: Comptes Rendus Mathematiques de l'Academie des Sciences = Mathematical reports of the academy of science. - : Elsevier. - 0706-1994. ; 353:12, s. 1061-1065
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Tidskriftsartikel (refereegranskat)abstract
- The connectivity of graphs of simplicial and polytopal complexes is a classical subject going back at least to Steinitz, and the topic has since been studied by many authors, including Balinski, Barnette, Athanasiadis, and Bjorner. In this note, we provide a unifying approach that allows us to obtain more general results. Moreover, we provide a relation to commutative algebra by relating connectivity problems to graded Betti numbers of the associated Stanley-Reisner rings.
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| 4. |
- Almkvist, Gert, et al.
(författare)
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Polynomials a' la Lehmers and Wilf
- 2009
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Ingår i: Mathematical Reports of the Academy of Science. - 0706-1994. ; 31:3, s. 65-71
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Tidskriftsartikel (refereegranskat)
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| 5. |
- Svensson, Bo, 1946-, et al.
(författare)
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Interdecadal changes in CO2 and CH4 fluxes of subarctic mire : Stordalen revisted after 20 years
- 1999
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Ingår i: Oikos. - : JSTOR. - 0030-1299 .- 1600-0706. ; 85:1, s. 22-30
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Tidskriftsartikel (refereegranskat)abstract
- The first subarctic wetland CO2 and CH4 flux measurements were made at Stordalen in the beginning of the 1970s in connection with the IBP study. A return to this area in 1994-95 offered a unique opportunity to study possible interdecadal changes in northern wetland CO2 and CH4 emissions. Measurements of CO2 and CH4 fluxes were carried out in similar habitats as those investigated in 1974. The mire distribution of wet minerotrophic areas relative to the elevated ombrotrophic areas had changed dramatically over the twenty years. There were no significant differences between the CH4-flux in 1974, 1994, and 1995. However, the CO2 fluxes were significantly higher in 1995 than in 1974. Since differences in climatic conditions gave no cause for such a change it suggests a possible increase in decomposition rate to be due to other factors. We suggest changes in vegetation composition, altered mineralization pathways and disintegration of permafrost as causes for the interdecadal increase in decomposition rates.
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