Results for 'Shigeyuki Tsuboi'

40 found
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  1. Gokui.Shigeyuki Tsuboi - 1973
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  2. On the Existence of Indiscernible Trees.Kota Takeuchi & Akito Tsuboi - 2012 - Annals of Pure and Applied Logic 163 (12):1891-1902.
    We introduce several concepts concerning the indiscernibility of trees. A tree is by definition an ordered set such that, for any a∈O, the initial segment {b∈O:b (...)
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  3.  9
    Generalized Amalgamation and N -Simplicity.Byunghan Kim, Alexei S. Kolesnikov & Akito Tsuboi - 2008 - Annals of Pure and Applied Logic 155 (2):97-114.
    We study generalized amalgamation properties in simple theories. We formulate a notion of generalized amalgamation in such a way so that the properties are preserved when we pass from T to Teq or Theq; we provide several equivalent ways of formulating the notion of generalized amalgamation.We define two distinct hierarchies of simple theories characterized by their amalgamation properties; examples are given to show the difference between the hierarchies.
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  4. On the Number of Independent Partitions.Akito Tsuboi - 1985 - Journal of Symbolic Logic 50 (3):809-814.
  5.  12
    On Generic Structures with a Strong Amalgamation Property.Koichiro Ikeda, Hirotaka Kikyo & Akito Tsuboi - 2009 - Journal of Symbolic Logic 74 (3):721-733.
    Let L be a finite relational language and α=(αR:R ∈ L) a tuple with 0 < αR ≤1 for each R ∈ L. Consider a dimension function $ \delta _\alpha (A) = \left| A \right| - \sum\limits_{R \in L} {\alpha {\mathop{\rm Re}\nolimits} R(A)} $ where each eR(A) is the number of realizations of R in A. Let $K_\alpha $ be the class of finite structures A such that $\delta _\alpha (X) \ge 0$ 0 for any substructure X of A. We (...)
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  6.  61
    On Theories Having a Finite Number of Nonisomorphic Countable Models.Akito Tsuboi - 1985 - Journal of Symbolic Logic 50 (3):806-808.
  7.  7
    On Theories Having Three Countable Models.Koichiro Ikeda, Akito Tsuboi & Anand Pillay - 1998 - Mathematical Logic Quarterly 44 (2):161-166.
    A theory T is called almost [MATHEMATICAL SCRIPT CAPITAL N]0-categorical if for any pure types p1,…,pn there are only finitely many pure types which extend p1 ∪…∪pn. It is shown that if T is an almost [MATHEMATICAL SCRIPT CAPITAL N]0-categorical theory with I = 3, then a dense linear ordering is interpretable in T.
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  8.  51
    Construction of Saturated Quasi-Minimal Structure.Masanori Itai, Akito Tsuboi & Kentaro Wakai - 2004 - Journal of Symbolic Logic 69 (1):9-22.
    The notion of quasi-minimal structures was defined by B. Zil'ber as a natural generalization of minimal structures. Inspired by his work, we study here basic model theoretic properties of quasiminimal structures. Main result is the construction of ω-saturated quasi-minimal models under ω-stability assumption.
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  9.  10
    A Note on Stationarity of Types Over Models in Simple Theories.Makoto Kobayashi & Akito Tsuboi - 2008 - Mathematical Logic Quarterly 54 (6):625-628.
    We investigate stationarity of types over models in simple theories. In particular, we show that in simple theories with finite SU-rank, any complete type over a model having Cantor-Bendixson rank is stationary.
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  10.  20
    Random Amalgamation of Simple Theories.Akito Tsuboi - 2001 - Mathematical Logic Quarterly 47 (1):45-50.
    Let T1 and T2 be two simple complete theories in disjoint languages. We prove that there is a simple complete theory which extends T1 ∪ T2 if T2 has a certain condition.
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  11.  6
    Models Omitting Given Complete Types.Akito Tsuboi - 2008 - Notre Dame Journal of Formal Logic 49 (4):393-399.
    We consider a problem of constructing a model that omits given complete types. We present two results. The first one is related to the Lopez-Escobar theorem and the second one is a version of Morley's omitting types theorem.
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  12.  7
    Algebraic Types and Automorphism Groups.Akito Tsuboi - 1993 - Journal of Symbolic Logic 58 (1):232-239.
  13.  19
    On Definability of Normal Subgroups of a Superstable Group.Akito Tsuboi - 1992 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 38 (1):101-106.
  14.  19
    Categoricity and Non-Orthogonality of Types.Akito Tsuboi - 1987 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 33 (4):335-338.
  15.  26
    On Reduction Properties.Hirotaka Kikyo & Akito Tsuboi - 1994 - Journal of Symbolic Logic 59 (3):900-911.
  16.  13
    On Definability of Normal Subgroups of a Superstable Group.Akito Tsuboi - 1992 - Mathematical Logic Quarterly 38 (1):101-106.
    In this note we treat maximal and minimal normal subgroups of a superstable group and prove that these groups are definable under certain conditions. Main tool is a superstable version of Zil'ber's indecomposability theorem.
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  17.  10
    Almost Total Elementary Maps.Koichiro Ikeda & Akito Tsuboi - 1995 - Mathematical Logic Quarterly 41 (3):353-361.
    A partial map f of a structure M is called almost total if |M — dom| = |M — ran| < ω. We study a difference between an almost total elementary map and an automorphism.
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  18.  1
    Reinforcement Learning for Penalty Avoiding Rational Policy Making.Kazuteru Miyazaki, Sougo Tsuboi & Shigenobu Kobayashi - 2001 - Transactions of the Japanese Society for Artificial Intelligence 16 (2):185-192.
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  19.  17
    Bodygraphic Injury Surveillance System.Toshiki Tsuboi, Koji Kitamura, Yoshihumi Nishida, Yoichi Motomura, Tachio Takano, Tatsuhiro Yamanaka & Hiroshi Mizoguchi - 2009 - Transactions of the Japanese Society for Artificial Intelligence 24:558-568.
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  20.  7
    Categoricity and Non‐Orthogonality of Types.Akito Tsuboi - 1987 - Mathematical Logic Quarterly 33 (4):335-338.
  21.  21
    Nonstandard Models That Are Definable in Models of Peano Arithmetic.Kazuma Ikeda & Akito Tsuboi - 2007 - Mathematical Logic Quarterly 53 (1):27-37.
    In this paper, we investigate definable models of Peano Arithmetic PA in a model of PA. For any definable model N without parameters in a model M, we show that N is isomorphic to M if M is elementary extension of the standard model and N is elementarily equivalent to M. On the other hand, we show that there is a model M and a definable model N with parameters in M such that N is elementarily equivalent to M but (...)
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  22.  21
    Definability of Initial Segments.Akito Tsuboi & Saharon Shelah - 2002 - Notre Dame Journal of Formal Logic 43 (2):65-73.
    In any nonstandard model of Peano arithmetic, the standard part is not first-order definable. But we show that in some model the standard part is definable as the unique solution of a formula , where P is a unary predicate variable.
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  23.  13
    Roles of O‐Linked Oligosaccharides in Immune Responses.Shigeru Tsuboi & Minoru Fukuda - 2001 - Bioessays 23 (1):46-53.
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  24.  14
    Strongly 2-Dimensional Theories.Akito Tsuboi - 1988 - Journal of Symbolic Logic 53 (3):931-936.
  25.  21
    Implicit Definability of Subfields.Akito Tsuboi & Kenji Fukuzaki - 2003 - Notre Dame Journal of Formal Logic 44 (4):217-225.
    We say that a subset A of M is implicitly definable in M if there exists a sentence $\phi$ in the language $\mathcal{L} \cup \{P\}$ such that A is the unique set with $ \models \phi$. We consider implicit definability of subfields of a given field. Among others, we prove the following: $\overline{\mathbb{Q}}$ is not implicitly $\emptyset$-definable in any of its elementary extension $K \succ \overline{\mathbb{Q}}$. $\mathbb{Q}$ is implicitly $\emptyset$-definable in any field K with tr.deg $_{\mathbb{Q}}K < \omega$. In a (...)
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  26.  8
    Expanding the Additive Reduct of a Model of Peano Arithmetic.Masahiko Murakami & Akito Tsuboi - 2003 - Mathematical Logic Quarterly 49 (4):363-368.
    Let M be a model of first order Peano arithmetic and I an initial segment of M that is closed under multiplication. LetM0 be the {0, 1,+}-reduct ofM. We show that there is another model N of PA that is also an expansion of M0 such that a · Ma = a · Na if and only if a ∈ I for all a ∈ M.
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  27.  7
    A Construction of Real Closed Fields.Yu-Ichi Tanaka & Akito Tsuboi - 2015 - Mathematical Logic Quarterly 61 (3):159-168.
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  28.  6
    Roles of O-Linked Oligosaccharides in Immune Responses.Shigeru Tsuboi & Minoru Fukuda - 2001 - Bioessays 23 (1):46-53.
  29.  6
    Model Companions of Theories of Graphs.Kota Takeuchi, Yu-Ichi Tanaka & Akito Tsuboi - 2015 - Mathematical Logic Quarterly 61 (3):236-246.
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  30.  11
    On Interpretability of Almost Linear Orderings.Akito Tsuboi & Kentaro Wakai - 1998 - Notre Dame Journal of Formal Logic 39 (3):325-331.
    In this paper we define the notion of -linearity for and discuss interpretability (and noninterpretability) of -linear orders in structures and theories.
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  31.  6
    On a Property of Ω-Stable Solvable Groups.Akito Tsuboi - 1988 - Archive for Mathematical Logic 27 (2):193-197.
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  32.  4
    Amalgamations Preserving ℵ1-Categoricity.Anand Pillay & Akito Tsuboi - 1997 - Journal of Symbolic Logic 62 (4):1070-1074.
  33.  3
    Learning From Crowds and Experts.Hiroshi Kajino, Yuta Tsuboi, Issei Sato & Hisashi Kashima - 2013 - Transactions of the Japanese Society for Artificial Intelligence 28 (3):243-248.
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  34. Proceedings of the 14th and 15th Asian Logic Conferences.Byunghan Kim, Jörg Brendle, Gyesik Lee, Fenrong Liu, R. Ramanujam, Shashi M. Srivastava, Akito Tsuboi & Liang Yu (eds.) - 2019
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  35. Changes in Motor-Related Cortical Activity Following Deep Brain Stimulation for Parkinson’s Disease Detected by Functional Near Infrared Spectroscopy: A Pilot Study.Takashi Morishita, Masa-aki Higuchi, Kazuya Saita, Yoshio Tsuboi, Hiroshi Abe & Tooru Inoue - 2016 - Frontiers in Human Neuroscience 10.
  36.  10
    The Effects of Family Socioeconomic Status on Psychological and Neural Mechanisms as Well as Their Sex Differences.Hikaru Takeuchi, Yasuyuki Taki, Rui Nouchi, Ryoishi Yokoyama, Yuka Kotozaki, Seishu Nakagawa, Atsushi Sekiguchi, Kunio Iizuka, Yuki Yamamoto, Sugiko Hanawa, Tsuyoshi Araki, Carlos Makoto Miyauchi, Kohei Sakaki, Takayuki Nozawa, Shigeyuki Ikeda, Susumu Yokota, Daniele Magistro, Yuko Sassa & Ryuta Kawashima - 2019 - Frontiers in Human Neuroscience 12.
  37.  30
    Influence of Income on Health Status and Healthcare Utilization in Working Adults: An Illustration of Health Among the Working Poor in Japan.Yasuharu Tokuda, Sachiko Ohde, Osamu Takahashi, Shigeaki Hinohara, Tsuguya Fukui, Takashi Inoguchi, James P. Butler & Shigeyuki Ueda - 2009 - Japanese Journal of Political Science 10 (1):79-92.
    Little is known about health of the growing subpopulation of the working poor in Japan. We aimed to evaluate health status and healthcare utilization in relation to income among Japanese working adults. We conducted a one-month prospective cohort study using a health diary in working adults from a nationally representative random sample in Japan. Based on the government criterion, the working poor group was defined as earning an equivalent annual income of less than 1.48 million Japanese-yen. For health status, we (...)
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  38.  26
    Alison Walsh. Relations Between Logic and Mathematics in the Work of Benjamin and Charles S. Peirce. Boston: Docent Press, 2012. ISBN 978-098370046-3 . Pp. X + 314. [REVIEW]Shigeyuki Atarashi - 2015 - Philosophia Mathematica 23 (1):148-152.
  39.  12
    Motivation in Vigilance: Effects of Self-Evaluation and Experimenter-Controlled Feedback.Joel S. Warm, Frederick H. Kanfer, Shigeyuki Kuwada & Jeffrey L. Clark - 1972 - Journal of Experimental Psychology 92 (1):123.
  40.  11
    Peirce’s Reception in Japan.Atarashi Shigeyuki - 2014 - European Journal of Pragmatism and American Philosophy 6 (1).