31 citations
- National Taiwan UniversityTW2 papers
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- Digital CatapultGB1 paper
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- Institute of Mathematics, Academia SinicaTW1 paper
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- Peking UniversityCN1 paper
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Showing 2014Show all
3 papers · 1 filter
physics.med-ph2014★ 11 cited
String-Averaging Expectation-Maximization for Maximum Likelihood Estimation in Emission Tomography
E. S. Helou, Y. Censor, T. -B. Chen +4
We study the maximum likelihood model in emission tomography and propose a new family of algorithms for its solution, called String-Averaging Expectation-Maximization (SAEM). In th…
math.GR2014
Commutator subgroup of the Hecke group is not congruence
Cheng Lien Lang, Mong Lung Lang
We prove that the power subgroup and the commutator subgroup of the Hecke group are not congruence.
math.GR2014★ 2 cited
Wohlfahrt's Theorem for the Hecke group G_5
Cheng Lien Lang, Mong Lung Lang
Let K be a subgroup of the inhomogeneous Hecke group G_5 of finite index. Suppose that the geometric level of K is r. Then K is congruence if and only if K contains the principal c…