converse theorems
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2020 ◽  
Vol 12 (1) ◽  
pp. 85-96
Author(s):  
Zoltán Finta

AbstractFor the sequence of King operators, we establish a direct approximation theorem via the first order Ditzian-Totik modulus of smoothness, and a converse approximation theorem of Berens-Lorentz-type.







2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Tadashi Miyazaki ◽  
Fumihiro Sato ◽  
Kazunari Sugiyama ◽  
Takahiko Ueno


Entropy ◽  
2019 ◽  
Vol 21 (12) ◽  
pp. 1171 ◽  
Author(s):  
Daming Cao ◽  
Lin Zhou ◽  
Vincent Y. F. Tan

By proving a strong converse theorem, we strengthen the weak converse result by Salehkalaibar, Wigger and Wang (2017) concerning hypothesis testing against independence over a two-hop network with communication constraints. Our proof follows by combining two recently-proposed techniques for proving strong converse theorems, namely the strong converse technique via reverse hypercontractivity by Liu, van Handel, and Verdú (2017) and the strong converse technique by Tyagi and Watanabe (2018), in which the authors used a change-of-measure technique and replaced hard Markov constraints with soft information costs. The techniques used in our paper can also be applied to prove strong converse theorems for other multiterminal hypothesis testing against independence problems.



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