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Concept
Conchoid of de Sluze
Summary
In algebraic geometry, the conchoids of de Sluze are a family of plane curves studied in 1662 by Walloon mathematician René François Walter, baron de Sluze.
The curves are defined by the polar equation
In cartesian coordinates, the curves satisfy the implicit equation
except that for a = 0 the implicit form has an acnode (0,0) not present in polar form.
They are rational, circular, cubic plane curves.
These expressions have an asymptote x = 1 (for a ≠ 0). The point most distant from the asymptote is (1 + a, 0). (0,0) is a crunode for a < −1.
The area between the curve and the asymptote is, for a ≥ −1,
while for a < −1, the area is
If a < −1, the curve will have a loop.
Official source
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