527 research outputs found
Four problems regarding representable functors
Let , be two rings, an -coring and the
category of left -comodules. The category of all representable functors is shown to be equivalent to the opposite of the
category . For an -bimodule we give
necessary and sufficient conditions for the induction functor to be: a representable functor, an
equivalence of categories, a separable or a Frobenius functor. The latter
results generalize and unify the classical theorems of Morita for categories of
modules over rings and the more recent theorems obtained by Brezinski,
Caenepeel et al. for categories of comodules over corings.Comment: 16 pages, the second versio
Self-Reported Memory for Abuse Depends Upon Victim-Perpetrator Relationship
Article copies available
for a fee from The Haworth Document Delivery Service: 1-800-342-9678.
E-mail address: Website: (c) 2001 by The Haworth Press, Inc. All rights reserved.We present preliminary results from the Betrayal Trauma Inventory (BTI) testing predictions from betrayal trauma theory (Freyd, 1994, 1996, in press) about the relationship between amnesia and betrayal by a caregiver. The BTI assesses trauma history using behaviorally defined events in the domains of sexual, physical, and emotional childhood abuse, as well as other lifetime traumatic events. When participants endorse an abuse experience, follow-up questions assess a variety of factors including memory impairment and perpetrator relationship. Preliminary results support our prediction that abuse perpetrated by a caregiver is related to less persistent memories of abuse. This relationship is significant for sexual and physical abuse. Regression analyses revealed that age was not a significant predictor of memory impairment and that duration of abuse could not account for the findings
Virtual Khovanov homology using cobordisms
We extend Bar-Natan's cobordism based categorification of the Jones
polynomial to virtual links. Our topological complex allows a direct extension
of the classical Khovanov complex (), the variant of Lee () and
other classical link homologies. We show that our construction allows, over
rings of characteristic two, extensions with no classical analogon, e.g.
Bar-Natan's -link homology can be extended in two non-equivalent
ways.
Our construction is computable in the sense that one can write a computer
program to perform calculations, e.g. we have written a Mathematica based
program.
Moreover, we give a classification of all unoriented TQFTs which can be used
to define virtual link homologies from our topological construction.
Furthermore, we prove that our extension is combinatorial and has semi-local
properties. We use the semi-local properties to prove an application, i.e. we
give a discussion of Lee's degeneration of virtual homology.Comment: 78 pages, lots of figures, lots of typos, rewritten version, merged
with arXiv:1212.0185, added referee's suggestions, to appear in J. Knot
Theor. Rami
A Coboundary Morphism For The Grothendieck Spectral Sequence
Given an abelian category with enough injectives we show that a
short exact sequence of chain complexes of objects in gives rise
to a short exact sequence of Cartan-Eilenberg resolutions. Using this we
construct coboundary morphisms between Grothendieck spectral sequences
associated to objects in a short exact sequence. We show that the coboundary
preserves the filtrations associated with the spectral sequences and give an
application of these result to filtrations in sheaf cohomology.Comment: 18 page
Sound and complete axiomatizations of coalgebraic language equivalence
Coalgebras provide a uniform framework to study dynamical systems, including
several types of automata. In this paper, we make use of the coalgebraic view
on systems to investigate, in a uniform way, under which conditions calculi
that are sound and complete with respect to behavioral equivalence can be
extended to a coarser coalgebraic language equivalence, which arises from a
generalised powerset construction that determinises coalgebras. We show that
soundness and completeness are established by proving that expressions modulo
axioms of a calculus form the rational fixpoint of the given type functor. Our
main result is that the rational fixpoint of the functor , where is a
monad describing the branching of the systems (e.g. non-determinism, weights,
probability etc.), has as a quotient the rational fixpoint of the
"determinised" type functor , a lifting of to the category of
-algebras. We apply our framework to the concrete example of weighted
automata, for which we present a new sound and complete calculus for weighted
language equivalence. As a special case, we obtain non-deterministic automata,
where we recover Rabinovich's sound and complete calculus for language
equivalence.Comment: Corrected version of published journal articl
Division, adjoints, and dualities of bilinear maps
The distributive property can be studied through bilinear maps and various
morphisms between these maps. The adjoint-morphisms between bilinear maps
establish a complete abelian category with projectives and admits a duality.
Thus the adjoint category is not a module category but nevertheless it is
suitably familiar. The universal properties have geometric perspectives. For
example, products are orthogonal sums. The bilinear division maps are the
simple bimaps with respect to nondegenerate adjoint-morphisms. That formalizes
the understanding that the atoms of linear geometries are algebraic objects
with no zero-divisors. Adjoint-isomorphism coincides with principal isotopism;
hence, nonassociative division rings can be studied within this framework.
This also corrects an error in an earlier pre-print; see Remark 2.11
2-Vector Spaces and Groupoids
This paper describes a relationship between essentially finite groupoids and
2-vector spaces. In particular, we show to construct 2-vector spaces of
Vect-valued presheaves on such groupoids. We define 2-linear maps corresponding
to functors between groupoids in both a covariant and contravariant way, which
are ambidextrous adjoints. This is used to construct a representation--a weak
functor--from Span(Gpd) (the bicategory of groupoids and spans of groupoids)
into 2Vect. In this paper we prove this and give the construction in detail.Comment: 44 pages, 5 figures - v2 adds new theorem, significant changes to
proofs, new sectio
University Crime Alerts: Do They Contribute to Institutional Betrayal and Rape Myths?
Universities are mandated by the Clery Act (20 USC § 1092(f)) to publicize the occurrence of certain campus crimes. Many universities rely on “Crime Alert” emails to quickly and effectively communicate when a crime has occurred. However, communications of sexual crimes are often narrow (e.g., limited to stranger-perpetrated crimes) and misleading (e.g., containing safety tips that are not applicable to most types of sexual violence). The current paper presents the results of two studies that test the effects of reading crime alert emails on subsequent endorsement of rape myths and institutional betrayal. In Study 1, participants read a typical crime alert email describing a stranger-perpetrated crime, an alternative email describing an acquaintance-perpetrated crime, or a control email describing an event unrelated to interpersonal violence. Men were significantly more likely to endorse rape myths than were women in the control condition, but not in the typical or alternative email condition. In addition, results from Study 1 indicate that issuing crime alert emails following stranger-perpetrated sexual violence leads to a sense of institutional betrayal among students who have experienced acquaintance-perpetrated violence. In Study 2, participants read a typical crime alert email or an alternative digest email. Participants who read the typical email reported higher rape myth acceptance, but not institutional betrayal, than those who read the digest email. There were also significant gender differences in student opinions of each email that suggest the digest email format may serve as a useful tool for engaging male students in the issue of campus sexual violence. Taken together, these studies provide converging evidence that university communication regarding sexual violence can either perpetuate or positively influence attitudes towards sexual violence
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