title: Identities in the Algebra of Partial Maps

authors: Jackson, Marcel

subjects: mathematics

abstract: We consider the identities of a variety of semigroup-related algebras modelling the algebra of partial maps. We show that the identities are intimately related to a weak semigroup deductive system and we show that the equational theory is decidable. We do this by giving a term rewriting system for the variety. We then show that this variety has many subvarieties whose equational theory interprets the full uniform word problem for semigroups and consequently are undecidable. As a corollary it is shown that the equational theory of Clifford semigroups whose natural order is a semilattice is undecidable.

text: Identities in the Algebra of Partial Maps We consider the identities of a variety of semigroup-related algebras modelling the algebra of partial maps. We show that the identities are intimately related to a weak semigroup deductive system and we show that the equational theory is decidable. We do this by giving a term rewriting system for the variety. We then show that this variety has many subvarieties whose equational theory interprets the full uniform word problem for semigroups and consequently are undecidable. As a corollary it is shown that the equational theory of Clifford semigroups whose natural order is a semilattice is undecidable.

year: 2006

title: Building digital library collections with greenstone

authors: Witten, Ian H.

subjects: computer science

abstract: This tutorial will demonstrate how to build a variety of different kinds of digital library collections with the Greenstone digital library software, a comprehensive, open-source system for constructing, presenting, and maintaining information collections. Collections will be built from HTML documents; Word, PDF and PostScript documents; images in various formats; MP3 and MIDI audio; MARC records; and more. For each collection, various different full-text search indexes and metadata-based browsers will be created. Attendees who wish to are encouraged to bring their laptops, install Greenstone from a CD-ROM that we will provide, along with various sample files, and follow along with the demonstrations on their own machine.

text: Building digital library collections with greenstone This tutorial will demonstrate how to build a variety of different kinds of digital library collections with the Greenstone digital library software, a comprehensive, open-source system for constructing, presenting, and maintaining information collections. Collections will be built from HTML documents; Word, PDF and PostScript documents; images in various formats; MP3 and MIDI audio; MARC records; and more. For each collection, various different full-text search indexes and metadata-based browsers will be created. Attendees who wish to are encouraged to bring their laptops, install Greenstone from a CD-ROM that we will provide, along with various sample files, and follow along with the demonstrations on their own machine.

year: 2005

title: In your face: wearing Moko - Maori facial marking in today's world

authors: Nikora, Linda Waimarie

subjects: Moko

abstract: The early voyagers, missionaries, settlers all reacted to the pukanohi, to the marked
faces of the Maori people during the period of first contact, and the century following
it. Their accounts are vivid, judgemental, revealing, telling us as much about them, as
it does about the people they described. Curiosity and horror are mixed with a
genuine fascination; where sternly evangelizing words failed, armed confrontation
occurred; and we now live with the results, te ao hou, a new world.
In this world, today, wahine mau kauae, tangata mau moko, pukanohi - wearers - are
speaking for themselves, about themselves, and commenting on how others view
them. Unanimously, they insist the decision to take the marking is about continuity,
affirmation, identity, and commitment. It is also about wearing those ancestors,
carrying them into the future; as their moko become a companion, a salient being with
its own life force, its own integrity and power, beyond the face.

text: In your face: wearing Moko - Maori facial marking in today's world The early voyagers, missionaries, settlers all reacted to the pukanohi, to the marked
faces of the Maori people during the period of first contact, and the century following
it. Their accounts are vivid, judgemental, revealing, telling us as much about them, as
it does about the people they described. Curiosity and horror are mixed with a
genuine fascination; where sternly evangelizing words failed, armed confrontation
occurred; and we now live with the results, te ao hou, a new world.
In this world, today, wahine mau kauae, tangata mau moko, pukanohi - wearers - are
speaking for themselves, about themselves, and commenting on how others view
them. Unanimously, they insist the decision to take the marking is about continuity,
affirmation, identity, and commitment. It is also about wearing those ancestors,
carrying them into the future; as their moko become a companion, a salient being with
its own life force, its own integrity and power, beyond the face.

year: 2003-08-01