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He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.

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Besides their practical uses, numbers have cultural significance throughout the world.Today, number systems are considered important special examples of much more general categories such as rings and fields, and the application of the term "number" is a matter of convention, without fundamental significance.Numbers should be distinguished from numerals, the symbols used to represent numbers.his document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale.It is not about the theory behind radiometric dating methods, it is about their , and it therefore assumes the reader has some familiarity with the technique already (refer to "Other Sources" for more information).

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ISBN is available in a C version and a C version and a FORTRAN90 version and a MATLAB version and a Python version.

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