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- W4313227811 abstract "We prove <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1</sup> two results about randomised query complexity $mathbf{R}(f)$. First, we introduce a linearised complexity measure LR and show that it satisfies an inner-optimal composition theorem: $mathbf{R}(f^{circ} g)geqOmega(mathbf{R}(f)mathbf{L R}(g))$ for all partial f and g, and moreover, LR is the largest possible measure with this property. In particular, LR can be polynomially larger than previous measures that satisfy an inner composition theorem, such as the max-conflict complexity of Gavinsky, Lee, Santha, and Sanyal (ICALP 2019). Our second result addresses a question of Yao (FOCS 1977). He asked if $epsilon$-error expected query complexity $overline{mathbf{R}}_{epsilon}(f)$ admits a distributional characterisation relative to some hard input distribution. Vereshchagin (TCS 1998) answered this question affirmatively in the bounded-error case. We show that an analogous theorem fails in the small-bias case $epsilon=1/2-o(1)$. <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1</sup> This is an extended abstract. For the full version of this article, please refer to [BDBGM22]." @default.
- W4313227811 created "2023-01-06" @default.
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- W4313227811 date "2022-10-01" @default.
- W4313227811 modified "2023-09-27" @default.
- W4313227811 title "Randomised Composition and Small-Bias Minimax" @default.
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- W4313227811 doi "https://doi.org/10.1109/focs54457.2022.00065" @default.
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