Unit 5 · Number Theory

Chapter 5.7

Whole Numbers Are Information

The word 'integer' in a problem is a clue: it cuts an equation with endless solutions down to a few.

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By the end

  1. 01Use integrality to narrow a range of answers to a few candidates
  2. 02Handle strict and non-strict bounds exactly
  3. 03Work with the greatest-integer function

In unit 5

  1. 5.1Factor Into Primes First
  2. 5.2Divisibility, GCD, and LCM
  3. 5.3Odd and Even
  4. 5.4Remainders and Cycles
  5. 5.5Digits, Bases, and Decimals
  6. 5.6Equations in Whole Numbers
  7. 5.7Whole Numbers Are Information
  8. 5.8Which Idea Opens It? Number Theory
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