1,021,956 research outputs found
The exponential map is chaotic: An invitation to transcendental dynamics
We present an elementary and conceptual proof that the complex exponential
map is "chaotic" when considered as a dynamical system on the complex plane.
(This result was conjectured by Fatou in 1926 and first proved by Misiurewicz
55 years later.) The only background required is a first undergraduate course
in complex analysis.Comment: 22 pages, 4 figures. (Provisionally) accepted for publication the
American Mathematical Monthly. V2: Final pre-publication version. The article
has been revised, corrected and shortened by 14 pages; see Version 1 for a
more detailed discussion of further properties of the exponential map and
wider transcendental dynamic
Indexing, screening, coding and cataloging of earth resources aircraft mission data
Tasks completed are as follows: (1) preparation of large Area Crop Inventory experiment for data base entry;(2) preparation of Earth Observations Aircraft Flight summary reports for publication; (3) updating of the aircraft mission index coverage map and Ames aircraft flight map; (4) Prepared of Earth Observation Helicopter Flight reports for publication; and (5) indexing of LANDSAT imagery. (6) formulation of phase 3 biowindows 1, 2, 3, and 4 listings by country, footprint, and acqusition dates; (7) preparation of flight summary reports; and (8) preparation of an Alaska state index coverage map
Fixed Point Indices and Manifolds with Collars
This paper concerns a formula which relates the Lefschetz number L(f) for a
map f:M --> M' to the fixed point index I(f) summed with the fixed point index
of a derived map on part of the boundary of M. Here M is a compact manifold and
M' is M with a collar attached.Comment: Accepted for publication in Fixed Point Theory and Applications as
part of the proceedings of the Newfoundland conference on fixed points, 200
Vanishing quantum discord is necessary and sufficient for completely positive maps
Two long standing open problems in quantum theory are to characterize the
class of initial system-bath states for which quantum dynamics is equivalent to
(1) a map between the initial and final system states, and (2) a completely
positive (CP) map. The CP map problem is especially important, due to the
widespread use of such maps in quantum information processing and open quantum
systems theory. Here we settle both these questions by showing that the answer
to the first is "all", with the resulting map being Hermitian, and that the
answer to the second is that CP maps arise exclusively from the class of
separable states with vanishing quantum discord.Comment: 4 pages, no figures. v2: Accepted for publication in Phys. Rev. Let
Mapping of quantum well eigenstates with semimagnetic probes
We present results of transmission measurements on CdTe quantum wells with
thin semimagnetic CdMnTe probe layers embedded in various positions along the
growth axis. The presence of the probes allow us to map the probability density
functions by two independent methods: analyzing the exciton energy position and
the exciton Zeeman splitting. We apply both approaches to map the first three
quantum well eigenstates and we find that both of them yield equally accurate
results.Comment: Accepted for publication in Physical Review
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