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Revision #1 to TR18-186 | 13th November 2018 20:06

#### Lower bounds for data structures with space close to maximum imply circuit lower bounds

Revision #1
Authors: Emanuele Viola
Accepted on: 13th November 2018 20:06
Keywords:

Abstract:

Let $f:\{0,1\}^{n}\to\{0,1\}^{m}$ be a function computable by a circuit with
unbounded fan-in, arbitrary gates, $w$ wires and depth $d$. With
a very simple argument we show that the $m$-query problem corresponding
to $f$ has data structures with space $s=n+r$ and time $(w/r)^{d}$,
for any $r$. As a consequence, in the setting where $s$ is close
to $m$ a slight improvement on the state of existing data-structure
lower bounds would solve long-standing problems in circuit complexity.
We also use this connection to obtain a data structure for error-correcting
codes which nearly matches the 2007 lower bound by Gal and Miltersen.
This data structure can also be made dynamic. Finally we give a problem
that requires at least $3$ bit probes for $m=n^{O(1)}$ and even
$s=m/2-1$.

An independent work by Dvir, Golovnev, and Weinstein (2018) gives an incomparable connection between data-structure lower bounds and matrix rigidity.

Changes to previous version:

Added a discussion of Dvir, Golovnev, and Weinstein (2018).

### Paper:

TR18-186 | 6th November 2018 19:07

#### Lower bounds for data structures with space close to maximum imply circuit lower bounds

TR18-186
Authors: Emanuele Viola
Publication: 6th November 2018 19:08
Keywords:

Abstract:

Let $f:\{0,1\}^{n}\to\{0,1\}^{m}$ be a function computable by a circuit with
unbounded fan-in, arbitrary gates, $w$ wires and depth $d$. With
a very simple argument we show that the $m$-query problem corresponding
to $f$ has data structures with space $s=n+r$ and time $(w/r)^{d}$,
for any $r$. As a consequence, in the setting where $s$ is close
to $m$ a slight improvement on the state of existing data-structure
lower bounds would solve long-standing problems in circuit complexity.
We also use this connection to obtain a data structure for error-correcting
codes which nearly matches the 2007 lower bound by Gal and Miltersen.
This data structure can also be made dynamic. Finally we give a problem
that requires at least $3$ bit probes for $m=n^{O(1)}$ and even
$s=m/2-1$.

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