By Narenda Govil, Ram N. Mohapatra, Zuhair Nashed, A. Sharma, J. Szabados

A set of over 30 rigorously chosen papers by way of forty five the world over well-known mathematicians, in honor of A. okay. Varma, reflecting his lifelong ardour for investigating polynomials, inequalities in Lp and uniform metrics.

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**Extra info for Approximation Theory: In Memory of A.K.Varma**

**Sample text**

A method is said to be A( a) -stable if the sector S",={z; larg(-z)l

6') (Brusselator reaction with diffusion) is a large 2N x 2N matrix. 17) -2 1 1 -2 The eigenvalues of K are known (see Sect. 18) 20 IV. x)2 (. 19) and are located between -40:( N + 1)2 and O. 16) with much smaller coefficients can be regarded as a small perturbation. 16) will remain close to those of the unperturbed matrix and lie in a stripe neighbouring the interval [-40:( N + 1)2, OJ. 9, while the unperturbed value is -4·412 . 28. 5 on the real axis (Fig. 1). In order to explain the behaviour of the beam equation, we linearize it in the neighbourhood of the solution ()k = k = 0, Fx = Fy = O.

With help of the polynomial x2 X M(x) = q8 +qs-11! +qs-2 2! XS + ... 21) the formulas for Q( z) and P( z) become more symmetric. We have Q(z) = M(8)(0) + M(s-l) (O)z + ... + M(O)zS P(z) = M(8)(1) + M(s-l) (l)z + ... 24) For the stability function of collocation methods we have the following nice result. 10 (K. P. Njljrsett 1975). The stability function of the collocation method based on the points c1 ' C2 , •.. 23), respectively, with M( x) given by 1 8 M(x) = I" II(x-Ci)· 8. 25) 48 IV. Stiff Problems - One-Step Methods Proof (Norsett & Wanner 1979).