On the Computation of the Projective Surgery Obstruction Groups
نویسنده
چکیده
The computation of the projective surgery obstruction groups LP.(ZG), for G a hyperelementary finite group, is reduced to standard calculations in number theory, mostly involving class groups. Both the exponent of the torsion subgroup and the precise divisibility of the signatures are determined. For G a 2-hyperelementary group, the LP.(ZG) are detected by restriction to certain subquotients of G, and a complete set of invariants is given for oriented surgery obstructions.
منابع مشابه
Projective Surgery Obstructions on Closed Manifolds
paper we answer the analogous questions (i) (iii) about the image ch(~,w) of C h in LP(~,w). These groups are the geometric surgery n n n obstruction groups of Maumary [M] or Taylor IT] ; algebraically they are L-groups of quadratic forms on projective (instead of free) Z~ modules [RI]. The appropriate version of (ii) is then to ask for i 1 invariants detecting o(f x id) where f x id: M x S ÷ N...
متن کاملThe Effect of Nasal Obstruction after Different Nasal Surgeries Using Acoustic Rhinometry and Nasal Obstruction Symptom Evaluation Scale
BACKGROUND The efficiency of nasal surgeries can be determined by objective or subjective methods. We have assessed the effect of nasal obstruction after different nasal surgeries using Acoustic Rhinometry (AR) and Nasal Obstruction Symptom Evaluation (NOSE) Scale. METHODS Between May 2011 and May 2012, 40 young adult patients and 10 healthy volunteers as control group who referred to ...
متن کاملComparison of Abdominal X-ray Findings and Results of Surgery in Neonates with Gastrointestinal Obstruction
Background Gastrointestinal (GI) obstruction is one of the most important surgical emergencies in neonates. Surgeons should select between conservative and invasive strategies. Imaging modalities are important in proper diagnosis. This study evaluates the sensitivity of abdominal radiographies (with or without contrast) in detection of neonatal GI obstruction. Materials and Methods A cross-sect...
متن کاملEffect of Small Intestine Strangulation Obstruction on Clinical and Histopathological Parameters An Experimental Study in Donkeys
To study clinical and histopathological changes occur within the first 12 hours of strangulating obstruction of the small intestine in equine, twenty five adult donkeys were used in an experimental study. Strangulation obstruction of the small intestine was performed for 3, 6, 9 and 12 hours, respectively. Clinical examination was done before surgery and at 3 hours intervals postoperatively. Af...
متن کاملPositive Cone in $p$-Operator Projective Tensor Product of Fig`a-Talamanca-Herz Algebras
In this paper we define an order structure on the $p$-operator projective tensor product of Herz algebras and we show that the canonical isometric isomorphism between $A_p(Gtimes H)$ and $A_p(G)widehat{otimes}^p A_p(H)$ is an order isomorphism for amenable groups $G$ and $H$.
متن کامل