Sequential fans in topology
نویسندگان
چکیده
منابع مشابه
Topology of partition of measures by fans and the second obstruction
The simultaneous partition problems are classical problems of the combinatorial geometry which have the natural flavor of the equivariant topology. The k-fan partition problems have attracted a lot of attention [1], [2], [17], [11] and forced some hard concrete combinatorial calculations in the equivariant cohomology [3]. These problems can be reduced, by a beautiful scheme of [1], to a ”typica...
متن کاملOn fans in multigraphs
We introduce a unifying framework for studying edge-colouring problems on multigraphs. This is defined in terms of a rooted directed multigraph F which is naturally associated to the set of fans based at a given vertex u in a multigraph G. We call F the “Fan Digraph”. We show that fans in G based at u are in one-to-one correspondence with directed trails in F starting at the root of F . We stat...
متن کامل2 Combinatorics and Topology of partitions of spherical measures by 2 and 3 fans
An arrangement of k-semilines in the Euclidean (projective) plane or on the 2-sphere is called a k-fan if all semilines start from the same point. A k-fan is an α-partition for a probability measure μ if μ(σi) = αi for each i = 1, . . . , k where {σi}ki=1 are conical sectors associated with the k-fan and α = (α1, . . . , αk). The problem whether for a given collection of measures μ1, . . . , μm...
متن کاملCharacterization of Fans in *-fields
In a formally real field, a fan is a certain special intersection of positive cones of orderings. Fans are very important to the study of quadratic forms over the field. The current status of the theory for commutative fields is well summarized in [9]. Our interest here will be in a *-field (D, *); that is, a skew field D with an involution *. The concept of *-ordering is due to Holland [8], th...
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With dramatic delivery, one of the newest American short story writers read two selec tions from her latest work, Black Tickets, last night in the Library Auditorium. Sensual in nature, both dealt with a char acter’s inner perception of life. Jayne Anne Phillips, at 26 critically acclaimed, spoke to an overflow crowd of 450, as the Sophomore Literary Festival continued. She opened with “ Home...
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ژورنال
عنوان ژورنال: Topology and its Applications
سال: 1995
ISSN: 0166-8641
DOI: 10.1016/0166-8641(95)00016-x