High School What are surreal numbers and how do they work?

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SUMMARY

Surreal numbers, a concept introduced by John Conway, serve as a comprehensive number system that includes real numbers, infinite numbers, and infinitesimals. They are notated using a recursive definition that allows for the construction of numbers through ordered pairs. To fully grasp surreal numbers, one must understand their expansion to infinities and infinitesimals, as well as their applications in various mathematical contexts. For an in-depth exploration, Conway's book "Numbers and Games" is highly recommended.

PREREQUISITES
  • Understanding of recursive definitions in mathematics
  • Familiarity with basic number systems, including real numbers
  • Knowledge of infinities and infinitesimals
  • Exposure to mathematical notation and terminology
NEXT STEPS
  • Read John Conway's "Numbers and Games" for foundational knowledge on surreal numbers
  • Explore the Wikipedia entry on surreal numbers for a broad overview
  • Study the detailed document available at https://www.whitman.edu/Documents/Academics/Mathematics/Grimm.pdf for advanced insights
  • Investigate the applications of surreal numbers in game theory and mathematical logic
USEFUL FOR

Mathematicians, educators, and students interested in advanced number theory, as well as anyone exploring the concepts of infinities and infinitesimals.

Aakash Lakshmanan
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Hey guys! I have heard of this concept in various places and sort of understands what it attempts to do. Can anybody please explain it to me in more detail like how it works, how to notate it, and how to expand it to infinities and infinitesimals. Thanks in advance!

Aakash Lakshmanan
xphysx.com - a repository of cool physics (and math)
 
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Aakash Lakshmanan said:
Hey guys! I have heard of this concept in various places and sort of understands what it attempts to do. Can anybody please explain it to me in more detail like how it works, how to notate it, and how to expand it to infinities and infinitesimals. Thanks in advance!

Aakash Lakshmanan
xphysx.com - a repository of cool physics (and math)

Hello, you can find detailed information at: https://www.whitman.edu/Documents/Academics/Mathematics/Grimm.pdf
 
Aakash Lakshmanan said:
Hey guys! I have heard of this concept in various places and sort of understands what it attempts to do. Can anybody please explain it to me in more detail like how it works, how to notate it, and how to expand it to infinities and infinitesimals. Thanks in advance!

Aakash Lakshmanan
xphysx.com - a repository of cool physics (and math)
Conway invented them and his little book, "Numbers and Games(?)" is terrific.
 
If there are an infinite number of natural numbers, and an infinite number of fractions in between any two natural numbers, and an infinite number of fractions in between any two of those fractions, and an infinite number of fractions in between any two of those fractions, and an infinite number of fractions in between any two of those fractions, and... then that must mean that there are not only infinite infinities, but an infinite number of those infinities. and an infinite number of those...

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