45,336 research outputs found
Non-PORC behaviour of a class of descendant -groups
We prove that the number of immediate descendants of order of is
not PORC (Polynomial On Residue Classes) where is the -group of order
defined by du Sautoy's nilpotent group encoding the elliptic curve
. This has important implications for Higman's PORC conjecture
Duality, Phase Structures and Dilemmas in Symmetric Quantum Games
Symmetric quantum games for 2-player, 2-qubit strategies are analyzed in
detail by using a scheme in which all pure states in the 2-qubit Hilbert space
are utilized for strategies. We consider two different types of symmetric games
exemplified by the familiar games, the Battle of the Sexes (BoS) and the
Prisoners' Dilemma (PD). These two types of symmetric games are shown to be
related by a duality map, which ensures that they share common phase structures
with respect to the equilibria of the strategies. We find eight distinct phase
structures possible for the symmetric games, which are determined by the
classical payoff matrices from which the quantum games are defined. We also
discuss the possibility of resolving the dilemmas in the classical BoS, PD and
the Stag Hunt (SH) game based on the phase structures obtained in the quantum
games. It is observed that quantization cannot resolve the dilemma fully for
the BoS, while it generically can for the PD and SH if appropriate correlations
for the strategies of the players are provided.Comment: 12 pages, 14 figure
The recreational value of beaches in the Nelson Mandela Bay area, South Africa
Using beach visitation data collected via the administration of a questionnaire to 226 respondents, this paper estimates a random utility model of beach recreation. The relative value of selected attributes of beaches is estimated, and the recreational values of lost access to four Blue Flag beaches in the Nelson Mandela Bay area, namely Kings beach, Humewood beach, Hobie beach and Wells Estate beach, respectively are calculated to be R44.73, R24.61, R37.85 and R2.68 per person, per trip.
Coalitions in the quantum Minority game: classical cheats and quantum bullies
In a one-off Minority game, when a group of players agree to collaborate they
gain an advantage over the remaining players. We consider the advantage
obtained in a quantum Minority game by a coalition sharing an initially
entangled state versus that obtained by a coalition that uses classical
communication to arrive at an optimal group strategy. In a model of the quantum
Minority game where the final measurement basis is randomized, quantum
coalitions outperform classical ones when carried out by up to four players,
but an unrestricted amount of classical communication is better for larger
coalition sizes.Comment: 12 pages, 1 figur
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