[Colloquium] Theory Speaker Alexander Golovnev

[Donna Brooms]

REMINDER:

Department of Mathematics & Computer Science
Combinatorics & Theory Seminar

Alexander Golovnev
Harvard University

Tuesday, November 12, 2019
Ryerson 251 @ 3:30pm

Title: Static Data Structure Lower Bounds Imply Rigidity

Abstract: We show that static data structure lower bounds in the group (linear) model imply semi-explicit lower bounds on matrix rigidity. In particular, we prove that an explicit lower bound of t > omega(log^2 n) on the cell-probe complexity of linear data structures in the group model, even against arbitrarily small linear space (s = (1 + eps)n), would already imply a semi-explicit (P^NP) construction of rigid matrices with significantly better parameters than the current state of art (Alon, Panigrahy and Yekhanin, 2009). Our results further assert that polynomial (t ≥ n^delta) data structure lower bounds against near-optimal space, would imply super-linear circuit lower bounds for log-depth linear circuits (a four-decade open question). In the succinct space regime (s = n + o(n)), we show that any improvement on current cell-probe lower bounds in the linear model would also imply new rigidity bounds. Our results rely on a new connection between the “inner” and “outer” dimensions of a matrix (Paturi and Pudlak, 2006), and on a new reduction from worst-case to average-case rigidity, which is of independent interest.

Joint work with Zeev Dvir and Omri Weinstein.

Donna Brooms-Blue



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