620 research outputs found
Descriptive set theoretic methods applied to strictly singular and strictly cosingular operators
The class of strictly singular operators originating from the dual of a
separable Banach space is written as an increasing union of
subclasses which are defined using the Schreier sets. A question of J. Diestel,
of whether a similar result can be stated for strictly cosingular operators, is
studied
Generalised Entropy MDPs and Minimax Regret
Bayesian methods suffer from the problem of how to specify prior beliefs. One
interesting idea is to consider worst-case priors. This requires solving a
stochastic zero-sum game. In this paper, we extend well-known results from
bandit theory in order to discover minimax-Bayes policies and discuss when they
are practical.Comment: 7 pages, NIPS workshop "From bad models to good policies
Negative Giant Longitudinal Magnetoresistance in NiMnSb/InSb: An interface effect
We report on the electrical and magneto-transport properties of the contact
formed between polycrystalline NiMnSb thin films grown using pulsed laser
deposition (PLD) and n-type degenerate InSb (100) substrates. A negative giant
magnetoresistance (GMR) effect is observed when the external magnetic field is
parallel to the surface of the film and to the current direction. We attribute
the observed phenomenon to magnetic precipitates formed during the magnetic
film deposition and confined to a narrow layer at the interface. The effect of
these precipitates on the magnetoresistance depends on the thermal processing
of the system.Comment: 14 pages, 4 figure
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