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The Egyptians invented the first ciphered numeral system, and the Greeks followed by mapping their counting numbers onto Ionian and Doric alphabets.

Roman numerals, a system that used combinations of letters from the Roman alphabet, remained the dominant numeral system in Europe until the late Middle Ages.

The rules stated should, in most cases, be regarded as guidelines for general use that may be superseded by the requirements of particular applications. Although both commas and spaces are still widely used in Canada, recommends that, except in financial documents, a space be used instead of a comma.

During the 19th century, mathematicians began to develop many different abstractions which share certain properties of numbers and may be seen as extending the concept.

Among the first were the hypercomplex numbers, which consist of various extensions or modifications of the complex number system.

Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

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

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