Algebra lineal y algunas de sus aplicaciones by L.I. GOLOVINA

By L.I. GOLOVINA

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With the help of (9), we can find the solution of the homogeneous equation (1) for the special case when X =k0 is an eigenvalue. To this end, let us suppose that A = X0 is a zero of multiplicity m of the function D(X). , Dm_, may not identically vanish. , Dm_x that does not vanish identically. 3. Moreover, this means that Dr_ i = 0. ,. is a solution of the homogeneous equation (1). Substituting s at different points of the upper sequence in the minor Dr, we obtain r nontrivial solutions gf/Cs), / = l , .

Solve the integral equation g(s) = l+X je^'-tgWdt, — It considering separately all the exceptional cases. 5. In the integral equation g(s) = s2 + o j(sinsf)g(t)dt9 replace sin st by the first two terms of its power-series development sm st = st and obtain an approximate solution. 1. ITERATIVE SCHEME Ordinary first-order differential equations can be solved by the wellknown Picard method of successive approximations. An iterative scheme based on the same principle is also available for linear integral equations of the second kind: g(s)=f(s) + XJK(s,t)g(t)dt.

ITERATIVE SCHEME 27 obtained by substituting the nth approximation in the right side of (1). There results the recurrence relation Qn+i(s) =f(s) + X j K(s,i)gn{t)dt. (4) If gn(s) tends uniformly to a limit as «-> oo, then this limit is the required solution. To study such a limit, let us examine the iterative procedure (4) in detail. The first- and second-order approximations are and g1(s)=Xs) + lJK(s,t)f(t)dt g2(s)=f(s) + (5) XJK(s,t)Xt)dt + X2 j K(s, i) [ j K(t, x)f{x) dx\ dt. (6) This formula can be simplified by setting K2 (s, i) = j K(s, x) K(x, t) dx (7) and by changing the order of integration.

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