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Numerous problems in Theoretical Computer Science can be solved very efficiently using powerful algebraic constructions. Computing shortest paths, constructing expanders, and proving the PCP Theorem, are just few examples of this phenomenon. The quest for combinatorial algorithms that do not use...
Two identical (anonymous) mobile agents start from arbitrary nodes of an unknown tree and have to meet at some node. Agents move in synchronous rounds: in each round an agent can either stay at the current node or move to one of its neighbors. We consider deterministic algorithms for this...
We present an efficient, optimally-resilient Asynchronous Byzantine Agreement (ABA) protocol involving
$$n = 3t+1$$
parties over a completely asynchronous network, tolerating a computationally unbounded Byzantine adversary, capable of corrupting at most
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