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Electronic Colloquium on Computational Complexity

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TR19-171 | 27th November 2019
Oded Goldreich

Improved bounds on the AN-complexity of multilinear functions

Revisions: 5


We consider arithmetic circuits with arbitrary large (multi-linear) gates for computing multi-linear functions. An adequate complexity measure for such circuits is the maximum between the arity of the gates and their number.
This model and the corresponding complexity measure were introduced by Goldreich and Wigderson (ECCC, TR13-043, 2013), ... more >>>


TR19-170 | 27th November 2019
Prerona Chatterjee, Mrinal Kumar, Adrian She, Ben Lee Volk

A Quadratic Lower Bound for Algebraic Branching Programs

Revisions: 3

We show that any Algebraic Branching Program (ABP) computing the polynomial $\sum_{i = 1}^n x_i^n$ has at least $\Omega(n^2)$ vertices. This improves upon the lower bound of $\Omega(n\log n)$, which follows from the classical result of Baur and Strassen [Str73, BS83], and extends the results by Kumar [Kum19], which showed ... more >>>


TR19-169 | 21st November 2019
Lijie Chen, Ron Rothblum, Roei Tell, Eylon Yogev

On Exponential-Time Hypotheses, Derandomization, and Circuit Lower Bounds

Revisions: 2

The Exponential-Time Hypothesis ($ETH$) is a strengthening of the $\mathcal{P} \neq \mathcal{NP}$ conjecture, stating that $3\text{-}SAT$ on $n$ variables cannot be solved in time $2^{\epsilon\cdot n}$, for some $\epsilon>0$. In recent years, analogous hypotheses that are ``exponentially-strong'' forms of other classical complexity conjectures (such as $\mathcal{NP}\not\subseteq\mathcal{BPP}$ or $co\text{-}\mathcal{NP}\not\subseteq \mathcal{NP}$) have ... more >>>



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