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Concept
Plücker's conoid
Résumé
In geometry, Plücker's conoid is a ruled surface named after the German mathematician Julius Plücker. It is also called a conical wedge or cylindroid; however, the latter name is ambiguous, as "cylindroid" may also refer to an elliptic cylinder.
Plücker's conoid is the surface defined by the function of two variables:
This function has an essential singularity at the origin.
By using cylindrical coordinates in space, we can write the above function into parametric equations
Thus Plücker's conoid is a right conoid, which can be obtained by rotating a horizontal line about the z-axis with the oscillatory motion (with period 2π) along the segment [–1, 1] of the axis (Figure 4).
A generalization of Plücker's conoid is given by the parametric equations
where n denotes the number of folds in the surface. The difference is that the period of the oscillatory motion along the z-axis is 2π/n. (Figure 5 for n = 3)
File:Plucker conoid (n=2).gif|Animation of Plucker's conoid with {{math|1=''n'' = 2}}
File:Plucker's conoid (n=2).jpg|Plucker's conoid with {{math|1=''n'' = 2}}
File:Plucker's conoid (n=3).jpg|Plucker's conoid with {{math|1=''n'' = 3}}
File:Plucker's conoid (n=2).gif|Animation of Plucker's conoid with {{math|1=''n'' = 2}}
File:Plucker's conoid (n=3).gif|Animation of Plucker's conoid with {{math|1=''n'' = 3}}
File:Plucker's conoid (n=4).
Source officielle
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