Continuous and Discrete Dynamics near Manifolds of by B. Aulbach

By B. Aulbach

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Extra info for Continuous and Discrete Dynamics near Manifolds of Equilibria

Example text

Let x E X and y E X* - X. Suppose that y is defined by a weak star-filter 9 in X which converges to no point in X. If x E U E an,then U 4 9, that is, y 4 U*. Hence y 4 St(x, 4%';). Therefore n{St(x, a:) I a E R} c X, and n{St(x, 43:) I a E R} = a E n} = ci,{x>. n{st(x, an)[ On the other hand, the relation y 4 St(x, 99:) implies that x 4 St( y, 43:). Therefore we have n{St( y , )I %: a E Q} c X * - X. If z E X* - X and z # y, then the weak star-filter Y which defines z is different from 9. ): This proves the lemma.

This shows that y E CI(X* - H). Since H i s open in X*, we have y E X* - Hfor all H E &',which, however, contradicts the assumption that M is an open cover of X*. Finally, (c) is a direct consequence of (b). 0 In concluding this section, we shall show that Shanin's compactification, which is a generalization of the Wallman compactification, is obtained as the completion of a certain generalized uniform space. Let X be a weakly regular space and Y a base for the open sets of X satisfying conditions below: (i) X E Y, (ii) if G, H E Y, then G n H E 9, (iii) if x E G for G E Y, then there exist Gi E Y, i = I , .

Theorem. Any normal cover Q of a space X admits a normal sequence {Q,,} such that Ql < Q and either Card Q, < KOfor each n E N or Card Qn = Card Q for each n E N according as Card Q < KOor KO < Card Q. Proof. 5 and its remark we can inductively construct a sequence {W,,}of open covers such that W: < W n pwhere l , Wo= 42, and either Card Wn< KOfor each n E N or Card W,, = Card Q for each n E N according as Card 42 < KOor KO < Card 9. Let Qn = W2,,for each n E N. Then {Q,,} is the desired normal sequence since we have = W2fn+I) < 0 (Ktn+I)IA < %:+I < Kn = Qn (n > 1).

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