Abstract Our study investigates variations of seismic velocity that occur over short time scales hours. We use coda wave interferometry to inspect 5 months continuous data from a seismological array in southern Germany. This results relative velocities ( dv/ v ) show temporal on the order 10 −4 . Spectra series contain strong daily and sub‐daily behavior indicating changes are primarily caused ...

the theorem 12 in [a note on $p$-nilpotence and solvability of finite groups, j. algebra 321(2009) 1555--1560.] investigated the non-abelian simple groups in which some maximal subgroups have primes indice. in this note we show that this result can be applied to prove that the finite groups in which every non-nilpotent maximal subgroup has prime index aresolvable.

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This note examines the weak-form market efficiency of the Australian stock market. Daily returns from 6 January 1958 to 12 April 2006 and monthly returns from February 1875 to December 2005 are examined for random walks using serial correlation coefficient and runs tests, Augmented Dickey-Fuller, Phillips-Perron and Kwiatkowski, Phillips, Schmidt and Shin unit root tests and multiple variance r...

The main empirical motivation of using Lévy processes in finance comes from fitting asset return distributions. Consider the daily (either continuous or simple) returns of S&P 500 index (SPX) from Jan 2, 1980 to Dec 31, 2005. We plot the histogram of normalized (mean zero and variance one) daily simple returns in Figure 1, along with the standard normal density function. The max and min (which ...

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