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Bertrand curve
noun
Ber·trand curve
\ˈber-ˌtränd-, ber-ˈträⁿ-\
Definition of Bertrand curve
: either of two twisted curves having the property that the principal normals to one of them are also principal normals to the other
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Origin and Etymology of bertrand curve
after Joseph L. F. Bertrand †1900 French mathematician
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