MATRICES OF CARBONACEOUS CHONDRITES. K. Abe, N. Sakamoto, H. Kojima, A. N. Krot and H. Yurimoto. Department of Natural History Sciences, Hokkaido University, Sapporo 060-0810, JAPAN. E-mail: [email protected]. hokudai.ac.jp, Isotope Imaging Laboratory, Creative Research Institution Sousei, Hokkaido University, Sapporo, 001-0021, JAPAN, Antarctic Meteorite Research Center, National Institute of Pola...

This article tackles categorical coherence within a two-dimensional generalization of Lawvere’s functorial semantics. 2-theories, a syntactical way of describing categories with structure, are presented. From the perspective here afforded, many coherence results become simple statements about the quasi-Yoneda lemma and 2-theory-morphisms. Given two 2-theories and a 2-theory-morphism between the...

This short book for adolescents is one of a series giving information in story form, about careers. It is a useful idea and the essential facts about social work are correctly conveyed. Most important of all, is the skilful way in which the author has woven into her story the kind of personality needed for this type of work. Apart from the inappropriate dust cover (showing a nurse in uniform) t...

Recently, Andrews and Berkovich introduced a trinomial version of Bailey’s lemma. In this note we show that each ordinary Bailey pair gives rise to a trinomial Bailey pair. This largely widens the applicability of the trinomial Bailey lemma and proves some of the identities proposed by Andrews and Berkovich. The trinomial Bailey lemma In a recent paper, Andrews and Berkovich (AB) proposed a tri...

We report on some initial work in which we designed interactive graphics to help climate scientists identify and extract good examples of simulated storm-tracks from a large dataset to help disseminate information to various audiences. A side-effect of this work was that the exploratory potential offered by the interactive graphics helped our climate scientist coauthors validate and interpret t...

Let C1 and C2 be algebraic plane curves in C such that the curves intersect in d1 · d2 points where d1, d2 are the degrees of the curves respectively. Oka and Sakamoto proved that π1(C \ C1 ∪ C2)) ∼= π1(C \ C1)× π1(C \ C2) [1]. In this paper we prove the converse of Oka and Sakamoto’s result for line arrangements. Let A1 and A2 be non-empty arrangements of lines in C such that π1(M(A1 ∪ A2)) ∼=...