Hi , i have this problem , i need help with this exercise

If b B[a,r] , prove that exist s>0 such that B[a,r] B[b,s] =

Thanks

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- Aug 23rd 2012, 10:56 AMresident911metric space
Hi , i have this problem , i need help with this exercise

If b B[a,r] , prove that exist s>0 such that B[a,r] B[b,s] =

Thanks - Aug 23rd 2012, 11:21 AMPlatoRe: metric space