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PRODID:researchseminars.org
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BEGIN:VEVENT
SUMMARY:Renee Hoekzema (University of Oxford)
DTSTART:20210323T160000Z
DTEND:20210323T170000Z
DTSTAMP:20260404T094503Z
UID:NUTopSem/1
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/NUTop
 Sem/1/">Cut-and-paste invariants of manifolds via algebraic K-theory</a>\n
 by Renee Hoekzema (University of Oxford) as part of Northeastern Topology 
 Seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/NUTopSem/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christin Bibby (Louisiana State University)
DTSTART:20210330T160000Z
DTEND:20210330T170000Z
DTSTAMP:20260404T094503Z
UID:NUTopSem/2
DESCRIPTION:by Christin Bibby (Louisiana State University) as part of Nort
 heastern Topology Seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/NUTopSem/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jesus Gonzalez (Cinvestav)
DTSTART:20210406T160000Z
DTEND:20210406T170000Z
DTSTAMP:20260404T094503Z
UID:NUTopSem/3
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/NUTop
 Sem/3/">The cohomology ring of binary tree braid groups</a>\nby Jesus Gonz
 alez (Cinvestav) as part of Northeastern Topology Seminar\n\nAbstract: TBA
 \n
LOCATION:https://stable.researchseminars.org/talk/NUTopSem/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Suciu (Northeastern University)
DTSTART:20210413T160000Z
DTEND:20210413T170000Z
DTSTAMP:20260404T094503Z
UID:NUTopSem/4
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/NUTop
 Sem/4/">Finiteness properties\, cohomology jump loci\, and tropical variet
 ies</a>\nby Alex Suciu (Northeastern University) as part of Northeastern T
 opology Seminar\n\n\nAbstract\nThe Bieri--Neumann--Strebel--Renz invariant
 s $\\Sigma^q(X)$ of a connected\, finite-type CW-complex $X$ are the vanis
 hing loci for the Novikov--Sikorav homology of $X$ in degrees up to $q$.\n
 These invariants live in the unit sphere inside $H^1(X\,\\mathbb{R})$\; th
 is sphere can be thought of as parametrizing all free abelian covers of $X
 $\, while the $\\Sigma$-invariants keep track of the geometric finiteness 
 properties of those covers. On the other hand\, the characteristic varieti
 es $\\V^q(X) \\subset H^1(X\,\\mathbb{C}^{*})$ are the non-vanishing loci 
 in degree $q$ for homology with coefficients in rank $1$ local systems. Af
 ter explaining these notions and providing motivation\, I will describe a 
 rather surprising connection between these objects\, to wit: each BNSR inv
 ariant $\\Sigma^q(X)$ is contained in the complement of the tropicalizatio
 n of $V^{\\le q}(X)$. I will conclude with some examples and applications 
 pertaining to complex geometry\, group theory\, \nand low-dimensional topo
 logy.\n
LOCATION:https://stable.researchseminars.org/talk/NUTopSem/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Bianchi (University of Copenhagen)
DTSTART:20210420T160000Z
DTEND:20210420T170000Z
DTSTAMP:20260404T094503Z
UID:NUTopSem/5
DESCRIPTION:by Andrea Bianchi (University of Copenhagen) as part of Northe
 astern Topology Seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/NUTopSem/5/
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