somewhere near the beginning.

General basis representation problem

Filed under: Mathematics — Alex @ 4:23 pm 7/13/2007

Looks like everything is back up to speed. Here’s a problem to celebrate:

Let b be a real number such that |b| > 1 and D be a finite collection of real numbers. Show that either there is a number such that x cannot be written as  \sum_{j=-\infty}^M a_j b^j where M is a positive integer and \{a_j\} \subset D, or there is a number which has multiple representations of this form.

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