Tschirnhausen cubic
التعريفات والمعاني
== English ==
=== Alternative forms ===
Tschirnhaus' cubic
=== Etymology ===
Named after Ehrenfried Walther von Tschirnhaus (1651–1708), German mathematician, physicist, physician, and philosopher. The name was first used in a 1900 paper by R. C. Archibald.
=== Noun ===
Tschirnhausen cubic (plural Tschirnhausen cubics)
(geometry) A plane curve defined, in its left-opening form, by the polar equation
r
=
a
sec
3
(
θ
/
3
)
{\displaystyle r=a\sec ^{3}(\theta /3)}
where sec is the secant function.