Dewey Decimal Classification for Number Theory
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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
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $512 \cdotp 73$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $512 \cdotp 73$