Swallowtail Catastrophe
A Catastrophe which can occur for three control factors and one behavior axis. The equations
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display such a catastrophe (von Seggern 1993, Nordstrand). The above surface uses
and 
.
References
Nordstrand, T. ``Swallowtail.'' http://www.uib.no/people/nfytn/stltxt.htm. von Seggern, D. CRC Standard Curves and Surfaces. Boca Raton, FL: CRC Press, p. 94, 1993.
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