18,555 research outputs found
Chasing a myth? Searching for ‘self’ through lifestyle travel.
This paper problematises the concept of searching for self in the context of lifestyle travellers – individuals for whom extended leisure travel is a preferred lifestyle that they return to repeatedly. Qualitative findings on the search for self from in-depth semi-structured interviews with lifestyle travellers in northern India and southern Thailand are considered in light of opposing academic perspectives on self. The study reveals a theoretical tension that exists between lifestyle travellers who may seek a unified sense of self underpinned by the essentialist position that one’s ‘true self’ exists and contrasting academic viewpoints that conceptualise embodied selves as processual, situational and in flux
The symmetry of intersection numbers in group theory
For suitable subgroups of a finitely generated group, we define the
intersection number of one subgroup with another subgroup and show that this
number is symmetric. We also give an interpretation of this number.Comment: 19 pages. Published copy, also available at
http://www.maths.warwick.ac.uk/gt/GTVol2/paper2.abs.html . Includes erratum
added to the original, published 19 Mar 199
A class of unambiguous state discrimination problems achievable by separable measurements but impossible by local operations and classical communication
We consider an infinite class of unambiguous quantum state discrimination
problems on multipartite systems, described by Hilbert space , of any
number of parties. Restricting consideration to measurements that act only on
, we find the optimal global measurement for each element of this
class, achieving the maximum possible success probability of in all
cases. This measurement turns out to be both separable and unique, and by our
recently discovered necessary condition for local quantum operations and
classical communication (LOCC), it is easily shown to be impossible by any
finite-round LOCC protocol. We also show that, quite generally, if the input
state is restricted to lie in , then any LOCC measurement on an
enlarged Hilbert space is effectively identical to an LOCC measurement on
. Therefore, our necessary condition for LOCC demonstrates directly
that a higher success probability is attainable for each of these problems
using general separable measurements as compared to that which is possible with
any finite-round LOCC protocol.Comment: Version 2 has new title along with an added discussion about using an
enlarged Hilbert space and why this is not helpfu
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