6,459 research outputs found
Complexity-entropy analysis at different levels of organization in written language
Written language is complex. A written text can be considered an attempt to
convey a meaningful message which ends up being constrained by language rules,
context dependence and highly redundant in its use of resources. Despite all
these constraints, unpredictability is an essential element of natural
language. Here we present the use of entropic measures to assert the balance
between predictability and surprise in written text. In short, it is possible
to measure innovation and context preservation in a document. It is shown that
this can also be done at the different levels of organization of a text. The
type of analysis presented is reasonably general, and can also be used to
analyze the same balance in other complex messages such as DNA, where a
hierarchy of organizational levels are known to exist
Darboux transformations for a Bogoyavlenskii equation in 2+1 dimensions
We use the singular manifold method to obtain the Lax pair, Darboux
transformations and soliton solutions for a (2+1) dimensional integrable
equation.Comment: 7 pages, latex, to appear in the proceedings of the meeting
"Nonlinearity and Integrability" (Gallipoli, Italy, July 1999
Charles M. Breder, Jr.: Palmetto Key, 1942
Charles M. Breder and his wife Ethel spent part of the summer of 1942 at the Palmetto Key field station, known today as Cabbage Key, on the west coast of Florida south of
Charlotte Harbor. The Palmetto Key field station began in 1938 and ended in 1942 because of World War II. His Palmetto Key diary ran for 95 pages of notes, tables,
diagrams, drawings, lists, and business records and this report presents a variety of fascinating entries. Diaries from other years all bear Breder's style of discipline,
curiosity, humor, and speculations on nature. The diary was transcribed as part of the Coastal Estuarine Data/Document Rescue and Archeology effort for South Florida. (PDF contaons 24 pages
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