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By A.E.R. Woodcock

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Extra info for A Geometrical Study of the Elementary Catastrophes

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5 C ' + I 0 . 0 A ' - 8 . 0 A ' - 8 . 0 Fig. 30 50 A = - 8 . 0 B=+2. 0 A = - 8 . 0 A : - 8 . O A = -8. 0 A = - 8 . 0 B = - I . 0 C =+15,0 D : 0 . 0 D - 0 . O A : - 8 . 0 B : - 2 . 0 Fig. 0 A : - 8 . 0 D =0,0 Fig. 0 B A = -8. -I. 0 B = -I. 0 C =+20. 0 B : - I . 0 D : - 2 . 0 B = - I . O Fig. 0 B = - I . ed Surface Projections of Wigwam Sections of the Star 8 Catastrophe V = ~ on the p l ~ e Ax 6 Bx 5 + --~- + -~-- Cx 4 Dx 3 + -~- + -~-+ Ex 2 -~- + Fx. (D,E) A negative, B and F zero and C running from +20 to zero (Fig.

0 E:+l. 0 E:+I. 0 E=-I,0 Fig. 0 B : 0 . 0 41 Ruled Surface Projections of the Star Catastrophe 8 V = ~ Ax 6 Bx 5 Cx 4 Dx 3 Ex 2 + --~-- + -~-- + --~- + --~- + --~- + Fx. onto the ~lane (E,F) When A is negative, C large and positive and B and D zero, the singularity is simply cuspoid (Fig. 24, 25 and 26). However, as C is reduced, two Swallowtails begin to develop one on either edge of the cusp (see, for example, Fig. 24, C = +35 and +30); as C is further reduced than these Swallowtails grow to dominate the picture with the initially larger cusp region decaying to insignificance.

However, as C is reduced, two Swallowtails begin to develop one on either edge of the cusp (see, for example, Fig. 24, C = +35 and +30); as C is further reduced than these Swallowtails grow to dominate the picture with the initially larger cusp region decaying to insignificance. The general picture is of a Butterfly surface with a second small Butterfly replacing the central cusp in the area in which E and F are small also Figs. ) (Fig. 24 C = 20, for example, For C negative the Star Catastrophe collapses to become simply the Butterfly Catastrophe.

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