Alexander's Theorem

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More things to try:

• unknot
• area inside x^2 - 2xy + 4y^2 = 4
• differentiate erf(t)^2 wrt t

Cite this as:

Weisstein, Eric W. "Alexander's Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/AlexandersTheorem.html

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