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PRODID:researchseminars.org
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X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Renee Hoekzema (University of Oxford)
DTSTART;VALUE=DATE-TIME:20210323T160000Z
DTEND;VALUE=DATE-TIME:20210323T170000Z
DTSTAMP;VALUE=DATE-TIME:20230208T064006Z
UID:NUTopSem/1
DESCRIPTION:Title: Cut-and-paste invariants of manifolds via algebraic K-theory\nby Rene
e Hoekzema (University of Oxford) as part of Northeastern Topology Seminar
\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/NUTopSem/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christin Bibby (Louisiana State University)
DTSTART;VALUE=DATE-TIME:20210330T160000Z
DTEND;VALUE=DATE-TIME:20210330T170000Z
DTSTAMP;VALUE=DATE-TIME:20230208T064006Z
UID:NUTopSem/2
DESCRIPTION:by Christin Bibby (Louisiana State University) as part of Nort
heastern Topology Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/NUTopSem/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jesus Gonzalez (Cinvestav)
DTSTART;VALUE=DATE-TIME:20210406T160000Z
DTEND;VALUE=DATE-TIME:20210406T170000Z
DTSTAMP;VALUE=DATE-TIME:20230208T064006Z
UID:NUTopSem/3
DESCRIPTION:Title: The cohomology ring of binary tree braid groups\nby Jesus Gonzalez (C
investav) as part of Northeastern Topology Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/NUTopSem/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Suciu (Northeastern University)
DTSTART;VALUE=DATE-TIME:20210413T160000Z
DTEND;VALUE=DATE-TIME:20210413T170000Z
DTSTAMP;VALUE=DATE-TIME:20230208T064006Z
UID:NUTopSem/4
DESCRIPTION:Title: Finiteness properties\, cohomology jump loci\, and tropical varieties
\nby Alex Suciu (Northeastern University) as part of Northeastern Topology
Seminar\n\n\nAbstract\nThe Bieri--Neumann--Strebel--Renz invariants $\\Si
gma^q(X)$ of a connected\, finite-type CW-complex $X$ are the vanishing lo
ci for the Novikov--Sikorav homology of $X$ in degrees up to $q$.\nThese i
nvariants live in the unit sphere inside $H^1(X\,\\mathbb{R})$\; this sphe
re can be thought of as parametrizing all free abelian covers of $X$\, whi
le the $\\Sigma$-invariants keep track of the geometric finiteness propert
ies of those covers. On the other hand\, the characteristic varieties $\\V
^q(X) \\subset H^1(X\,\\mathbb{C}^{*})$ are the non-vanishing loci in degr
ee $q$ for homology with coefficients in rank $1$ local systems. After exp
laining these notions and providing motivation\, I will describe a rather
surprising connection between these objects\, to wit: each BNSR invariant
$\\Sigma^q(X)$ is contained in the complement of the tropicalization of $V
^{\\le q}(X)$. I will conclude with some examples and applications pertain
ing to complex geometry\, group theory\, \nand low-dimensional topology.\n
LOCATION:https://researchseminars.org/talk/NUTopSem/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Bianchi (University of Copenhagen)
DTSTART;VALUE=DATE-TIME:20210420T160000Z
DTEND;VALUE=DATE-TIME:20210420T170000Z
DTSTAMP;VALUE=DATE-TIME:20230208T064006Z
UID:NUTopSem/5
DESCRIPTION:by Andrea Bianchi (University of Copenhagen) as part of Northe
astern Topology Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/NUTopSem/5/
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