title: An Introduction to the Theory of Numbers (Oxford Science Publications)
author:  G. H. Hardy 
description: <br />"A <em>really</em> good book!"--Fernando Gouvea, <em>Colby College</em>
zlib_text: 310
  Glossary
  Glossary
  This glossary contains words and phrases from Fourth through Sixth Grade Everyday Mathematics. 
  To place the definitions in broader mathematical contexts, most entries also refer to sections in this 
  Teacher’s Reference Manual. In a definition, terms in italics are defined elsewhere in the glossary.
  acute triangle  A triangle with 
  three acute angles. See Section 
  13.4.2: Polygons (n-gons).
  Glossary
  absolute value  The distance between a number 
  and 0 on a number line. The absolute value of 
  a positive number is the number itself, and the 
  absolute value of a negative number is the 
  opposite of the number. The absolute value of 0 is 
  0. The symbol for the absolute value of n is |n|.
  abundant number  A counting number whose proper 
  factors add to a number greater than itself. For 
  example, 12 is an abundant number because 
  1 + 2 + 3 + 4 +  6 = 16, and 16 is greater than 
  12. Compare to deficient number and perfect 
  number. See Section 9.8.2: Perfect, Deficient, 
  an