2009 24th Annual IEEE Conference on Computational Complexity 2009
DOI: 10.1109/ccc.2009.31
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A Multi-Round Communication Lower Bound for Gap Hamming and Some Consequences

Abstract: The Gap-Hamming-Distance problem arose in the context of proving space lower bounds for a number of key problems in the data stream model. In this problem, Alice and Bob have to decide whether the Hamming distance between their n-bit input strings is large (i.e., at least n/2 + √ n) or small (i.e., at most n/2 − √ n); they do not care if it is neither large nor small. This ( √ n) gap in the problem specification is crucial for capturing the approximation allowed to a data stream algorithm.Thus far, for randomi… Show more

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Cited by 25 publications
(26 citation statements)
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“…Following [1] there was a long line of theoretical research on the approximation of the Distinct Element problem ( [21,2,22,23,4], see [5] for a survey of earlier results). Finally, Kane et al [4] gave the first optimal approximation algorithm for estimating the number of distinct elements in a data stream; for a data stream with alphabet of size n, given > 0 their algorithm computes a (1 ± ) multiplicative approximation using O ( −2 + log n) bits of space, with 2/3 success probability.…”
Section: Related Workmentioning
confidence: 99%
“…Following [1] there was a long line of theoretical research on the approximation of the Distinct Element problem ( [21,2,22,23,4], see [5] for a survey of earlier results). Finally, Kane et al [4] gave the first optimal approximation algorithm for estimating the number of distinct elements in a data stream; for a data stream with alphabet of size n, given > 0 their algorithm computes a (1 ± ) multiplicative approximation using O ( −2 + log n) bits of space, with 2/3 success probability.…”
Section: Related Workmentioning
confidence: 99%
“…As in the previous theorem, Alice and Bob each hold a binary vector of length n (a and b respectively). In addition, there is the promise on the Hamming distance H between the vectors so that either H(a, b) ≤ n 2 − √ n or H(a, b) ≥ n 2 + √ n. It is known that determining which case holds with a constant number of messages between Alice and Bob requires at least Ω(n) bits of communication [21,6].…”
Section: Lower Bounds For Confidence Estimationmentioning
confidence: 99%
“…The previous lower bound was Ω(min{N, ε −2 + log N }), and is the result of a sequence of work [2,6,38]. See [25,39] for simpler proofs.…”
Section: Tight Upper Bounds For L P -Estimationmentioning
confidence: 99%