Big Numbers

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Grade Vs Difficulty:
  EasyModerateChallengingPerplexing
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This lesson describes some of the largest finite numbers that have ever been written down. It is likely that anyone reading it will see a number larger than any number they ever saw before. The first constructions would be accessible to middle school students, but some of the later descriptions would make a college student think. This was contributed by Tom Davis.

http://www.geometer.org/mathcircles/