All mathematics is divided into three parts. Roughly, these parts are the study of number systems, called algebra; the study of geometrical spaces, called

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topology; and the study of functions, called analysis. There are also a few islands-number theory and set theory, for example -and two vast continents that have broken off from the mainland and are drifting -
\ill,,!lcolktll,lll ' out to sea: computer science and statistics.

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