By Dr. Yung-Chen Lu (auth.)

In April, 1975, I organised a convention on the Battelle examine middle, Seattle, Washington at the subject matter "Structural balance, disaster concept and their purposes within the sciences". To this convention have been invited a couple of mathematicians inquisitive about the mathematical theories of structural balance and disaster thought, and different mathematicians whose crucial curiosity lay in purposes to varied sciences - actual, organic, clinical and social. Rene Thorn and Christopher Zeeman figured within the record of amazing members. The convention aroused substantial curiosity, and lots of mathematicians who weren't experts within the fields coated via the convention expressed their wish to attend the convention classes; moreover, scientists from the Battelle laboratories got here to Seattle to benefit of advancements in those components and to think about attainable functions to their very own paintings. In view of the attendance of those mathematicians and scientists, and for you to let the expositions of the specialists to be intelligible to this wider viewers, I invited Professor Yung Chen Lu, of Ohio kingdom college, to return to Battelle Seattle previous to the particular convention to convey a chain of casual lecture-seminars, explaining the historical past of the mathematical concept and indicating the various real and attainable purposes. within the occasion, Yung-Chen Lu introduced his lectures within the week previous and the week following the particular convention, in order that the 1st 1/2 his path was once preparatory and the second one part explanatory and evaluative. those lecture notes represent an accelerated model of the course.

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**Extra resources for Singularity Theory and an Introduction to Catastrophe Theory**

**Sample text**

F. let J By definition, a point where (O,y) f(x,y) f (u,v) is stand for the determinant of the if there is no confusion to be feared. Thus, every point (O,y) such that Then the Jacobian matrix of We fix the following notation: Jacobian matrix of f:]R2 ~]R2 J = ° is a singularity of In this example, is called a singular f. 1 of Chapter 1 and we know it is stable. 1. For the same 34 as given in Example 1 . 1 in section 1 of Chapter 1, any small movement (or perturbation) of the mapping will not change its topological type (the proof will be given in section 6 of this chapter).

Ann)' where Thus ~ is an isomorphism of vector spaces. a ij = a ji with XO. into ~(n,l) ~ JRN fO for = a n = 0 and 32 D Let 8i be the subset of 8 in which rank D We shall use Whitney's argument [87] a stratified manifold of of f, Xo 8 = 80 U U 8n -1 . 8 is dim 8 + dim JRn = n(n ; 1) - 1 + n < N, f: JRn ... 1) to outline below a proof that dim(n(n + 1) - 1). Transversality Theorem. we o. D(a) n8 = ¢. This implies is non-degenerate in case it is a critical point f. 2 ) Given a E 8 i , there are i rows of D = D(a) Without loss of generality, we assume that these which are independent.

Same as above. Q= (x,y)1 x=i). 2. Case 3: P same as above. Q= (x,y)1 x + a = i where a>O). 3. Case 4: P same as above. 4. o~ 28 In Cases l and 3, the two curves P, Q intersect transversally since a small perturbation of either one of the maps would not change the type of However, this is no longer true for Cases 2 and 4 because a intersection. small deformation in Case 2 or 4 will change their type of intersection into Case l or Case 3 or even in Case 4, the type of intersection can be changed into the following type of intersection.