- #1

Oster

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What I don't quite understand is how these definitions imply that there exist 2 positive constants 'a' and 'b' such that a*d(x,y) <= f(x,y) <= b*d(x,y) for all x,y in X

Can someone please shed some light on this or point me in the direction of some related article.

PS can someone show me where the "less than equal to" sign is?

Thanks.