An Elementary Proof of the Restricted Invertibility Theorem

Speaker  Srivastava Nikhil

Affiliation  Princeton IAS

Host  Alexandra Kolla

Duration  00:57:06

Date recorded  10 February 2011

We give an elementary proof of a generalization of Bourgain and Tzafriri's Restricted Invertibility Theorem, which says roughly that any matrix with columns of unit length and bounded operator norm has a large coordinate subspace on which it is well-invertible. Our proof gives the tightest known form of this result, is constructive, and provides a deterministic polynomial time algorithm for finding the desired subspace.

Joint work with Dan Spielman.

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