Abstract. We obtain a fourth order accurate numerical algorithm to integrate the Zerilli and Regge-Wheeler wave equations, describing perturbations of nonrotating black holes, with source terms due to an orbiting particle. Those source terms contain Dirac’s delta and its first derivative. We also rederive the source of the Zerilli and Regge-Wheeler equations for more convenient definitions of t...

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A weight-based dynamic compression method has recently been proposed, which is especially suitable for the encoding of files with locally skewed distributions. Its main idea to assign larger weights closer be encoded symbols by means an increasing weight function, rather than considering each position in text evenly. well known transformation that tends convert input into a more distribution Bu...

This chapter reviews what has been learned about animal thinking from the study of animal communication, and considers what we might hope to learn in the future. It begins with a discussion on the importance of informational versus non-informational interpretations of animal communication and then considers what inferences can be drawn about the cognitive requirements of communication from the ...

We relate the Burrows-Wheeler transformation with a result in combinatorics on words known as the Gessel-Reutenauer transformation.