Pi Squared is Irrational/Historical Note
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Historical Note on Pi Squared is Irrational
$\pi^2$ was demonstrated to be irrational in $1794$ by Joseph Louis Lagrange.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $9 \cdotp 869 \, 604 \ldots$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $9 \cdotp 86960 \, 44010 \, 89358 \ldots$