Dewey Decimal Classification for Number Theory

Observation

The Dewey decimal classification for number theory used to be $512 \cdotp 81$.

Thus we have:

\(\ds 512\) \(=\) \(\ds 2^9\)
\(\ds 81\) \(=\) \(\ds 9^2\)

Unfortunately, since $1967$ it was changed to $512 \cdotp 73$, which needs some ingenious manipulation to demonstrate its numerological significance.


Sources

  • 1967: Martin Gardner: The Numerology of Dr. Matrix
  • 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $512 \cdotp 73$
  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $512 \cdotp 73$
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