Semicharacteristic classes
نویسندگان
چکیده
منابع مشابه
Relative semicharacteristic classes
§0. Introduction In 1973 Ronnie Lee introduced the notion of semicharacteristic classes, which are invariants of the bordism group yi^(Bn) of closed manifolds equipped with a free action of a finite group n. In this paper we relativize his theory. Associated to a homomorphism G->n of finite groups, there is the relative bordism group yim(BG-> Bn), which is the bordism group of compact manifolds...
متن کاملThe Surgery Semicharacteristic
Given a degree-one normal map ( / , / ) : (M",vM) -> (X, £), C. T. C. Wall defined the associated surgery obstruction a(f, f) e L^JLn^X). This obstruction vanishes if and only if (/, / ) is normally bordant to a simple homotopy equivalence. Using Wall's approach, one must perform preliminary surgery to make / highly connected before the obstruction can be calculated. It is natural to ask for in...
متن کاملPredicate Classes and Promise Classes
3 8 8 f ?g ? ? predicate classes promise classes Bernd Borchert Universität Heidelberg predicate classes promise function promise classes
متن کاملSome classes of strongly clean rings
A ring $R$ is a strongly clean ring if every element in $R$ is the sum of an idempotent and a unit that commutate. We construct some classes of strongly clean rings which have stable range one. It is shown that such cleanness of $2 imes 2$ matrices over commutative local rings is completely determined in terms of solvability of quadratic equations.
متن کاملPredicate Classes
Predicate classes are a new linguistic construct designed to complement normal classes in objectoriented languages. Like a normal class, a predicate class has a set of superclasses, methods, and instance variables. However, unlike a normal class, an object is automatically an instance of a predicate class whenever it satisfies a predicate expression associated with the predicate class. The pred...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Topology
سال: 1973
ISSN: 0040-9383
DOI: 10.1016/0040-9383(73)90006-2