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Course: Mathematics — Second Preparatory
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Curriculum

Mathematics — Second Preparatory

Unit 1: Real Numbers

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Unit 2: Algebra

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Unit 3: Geometry

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Unit 4: Statistics

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Text lesson

Intervals and Operations on Them

Mathematics — Second Preparatory

Intervals and Operations on Them

Unbounded intervals

Unbounded intervals

  • An interval may have no right endpoint or no left endpoint.
  • We use the symbol ∞ to show that it extends without a bound.
  • The symbols ∞ and −∞ are never written with a square bracket, because they are not numbers.
  • The interval (3, ∞) contains all numbers greater than 3.
  • The interval (−∞, 4] contains all numbers less than or equal to 4.
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