6 research outputs found
Combinatorial tangle Floer homology
In this paper we extend the idea of bordered Floer homology to knots and
links in : Using a specific Heegaard diagram, we construct gluable
combinatorial invariants of tangles in , and . The
special case of gives back a stabilized version of knot Floer homology.Comment: 106 pages, 44 figure
Legendrian and transverse twist knots
In 1997, Chekanov gave the first example of a Legendrian nonsimple knot type:
the knot. Epstein, Fuchs, and Meyer extended his result by showing
that there are at least different Legendrian representatives with maximal
Thurston--Bennequin number of the twist knot with crossing number
. In this paper we give a complete classification of Legendrian and
transverse representatives of twist knots. In particular, we show that
has exactly Legendrian representatives with
maximal Thurston--Bennequin number, and transverse
representatives with maximal self-linking number. Our techniques include convex
surface theory, Legendrian ruling invariants, and Heegaard Floer homology.Comment: 27 pages, v3: added figure, other minor changes, to appear in JEM
Infrastructural Speculations: Tactics for Designing and Interrogating Lifeworlds
This paper introduces âinfrastructural speculations,â an orientation toward speculative design that considers the complex and long-lived relationships of technologies with broader systems, beyond moments of immediate invention and design. As modes of speculation are increasingly used to interrogate questions of broad societal concern, it is pertinent to develop an orientation that foregrounds the âlifeworldâ of artifactsâthe social, perceptual, and political environment in which they exist. While speculative designs often imply a lifeworld, infrastructural speculations place lifeworlds at the center of design concern, calling attention to the cultural, regulatory, environmental, and repair conditions that enable and surround particular future visions. By articulating connections and affinities between speculative design and infrastructure studies research, we contribute a set of design tactics for producing infrastructural speculations. These tactics help design researchers interrogate the complex and ongoing entanglements among technologies, institutions, practices, and systems of power when gauging the stakes of alternate lifeworlds