# Mathematician:Leonhard Paul Euler/Mistake

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## Source Work

1986: David Wells: *Curious and Interesting Numbers*:

- The Dictionary
- $3 \cdotp 14159 \, 26535 \, 89793 \, 23846 \, 26433 \, 83279 \, 50288 \, 41972 \ldots$

## Mistake

*Euler ... gave an even more impressive demonstration of the power of these new methods by calculating $\pi$ to $20$ decimal places in just one hour.*

In David Wells: *Curious and Interesting Numbers* (2nd ed.), this has been amended to:

*... $10$ places in just one hour*.

It is assumed that the original statement of $20$ must have been erroneous, and that the second edition corrected it.

However, this needs to be properly established by investigating the literature. David Wells does not provide a source.

## Sources

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $3 \cdotp 14159 \, 26535 \, 89793 \, 23846 \, 26433 \, 83279 \, 50288 \, 41972 \ldots$