The variety which is an invariant of degree four and is given by the equation
Burkhardt Quartic
See also
Quartic EquationExplore with Wolfram|Alpha
References
Burkhardt, H. "Untersuchungen aus dem Gebiet der hyperelliptischen Modulfunctionen. II." Math. Ann. 38, 161-224, 1890.Burkhardt, H. "Untersuchungen aus dem Gebiet der hyperelliptischen Modulfunctionen. III." Math. Ann. 40, 313-343, 1892.Hunt, B. "The Burkhardt Quartic." Ch. 5 in The Geometry of Some Special Arithmetic Quotients. New York: Springer-Verlag, pp. 168-221, 1996.Referenced on Wolfram|Alpha
Burkhardt QuarticCite this as:
Weisstein, Eric W. "Burkhardt Quartic." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/BurkhardtQuartic.html