Theoretical Computer Science
Superconcentrators of depths 2 and 3; odd levels help (rarely)
Journal of Computer and System Sciences
Boolean Circuits, Tensor Ranks, and Communication Complexity
SIAM Journal on Computing
Bounds for Dispersers, Extractors, and Depth-Two Superconcentrators
SIAM Journal on Discrete Mathematics
Lower Bounds for Matrix Product in Bounded Depth Circuits with Arbitrary Gates
SIAM Journal on Computing
Superconcentrators, generalizers and generalized connectors with limited depth
STOC '83 Proceedings of the fifteenth annual ACM symposium on Theory of computing
Cracks in the defenses: scouting out approaches on circuit lower bounds
CSR'08 Proceedings of the 3rd international conference on Computer science: theory and applications
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We consider depth-2 and 3 circuits over the basis consisting of all Boolean functions. For depth-3 circuits, we prove a lower bound Ω(n log n) for the size of any circuit computing the cyclic convolution. For depth-2 circuits, a lower bound Ω(n3/2) for the same function was obtained in our previous paper [10]. Here we present an improved proof of this bound. Both lower bounds are the best known for depth-3 and depth-2 circuits, respectively.