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DTSTAMP:20261012T104103
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T172000
SUMMARY:Workshop / Seminar:Easy to Collect\, Costly to Bear: Mobile Money Taxation and  Network Spillovers in Tanzania
DESCRIPTION:This paper provides evidence that a tax on mobile money transactions shrinks its base by an order of magnitude more than taxes on income or turnover do\, that the base responds to whether it is taxed rather than to how much\, and that the damage spreads through the payment network to users and payments the law never taxed. First\, using the complete transaction records of Tanzania’s three largest providers around the introduction of a notched levy on person-to-person transfers and cash withdrawals in July 2021\, we show that the levy reduces the volume of taxed transactions by 23 percent and their average value by 13 percent relative to untaxed transactions on the same platform\, an elasticity with respect to the net-of-tax price of about 10. Second\, we show that a cut of about 30 percent seven weeks later brings none of it back\, nor do two further cuts\, while the removal of the levy on transfers in 2023 does\, slowly. Third\, we document that relationships between senders and receivers survive at two-thirds the normal rate\, that new ones form at less than half the pre-levy pace\, and that senders stop rerouting activity around recipients who go quiet\; none of these margins recovers when the tax rate falls. Fourth\, we find that the levy reaches activity it does not tax\, as wages paid into wallets fall by a fifth\, and that senders of every size cut back by a similar share\, whether or not they have a bank account. Fifth\, we estimate that the levy destroys 47 cents of surplus for every shilling it raises\, several times the cost of a value-added tax in comparable settings.
UID:149332-21906243@events.umich.edu
URL:https://events.umich.edu/event/149332
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Public Finance,seminar,Economics
LOCATION:North Quad - 4325
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261102T122104
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T170000
SUMMARY:Conference / Symposium:Florent Gillet (2026-2027) (Housing)
DESCRIPTION:
UID:150389-21915523@events.umich.edu
URL:https://events.umich.edu/event/150389
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Sessions
LOCATION:Florent Gillet Lobby
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261030T155140
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T170000
SUMMARY:Workshop / Seminar:GLNT: Modular Character Sheaves and Monodromic Hecke Categories
DESCRIPTION:Abstract:  Character sheaves provide a geometric framework for studying characters of finite groups of Lie type. Introduced by Lusztig in the 1980s\, they played a central role in the classification of irreducible complex representations of these groups and in the computation of their characters. Although the definition of character sheaves can be formulated with modular coefficients\, much of Lusztig's characteristic-zero machinery breaks down in this setting.\n\nIn this talk\, I will give a streamlined overview of the theory of character sheaves using modern language from categorical representation theory. From this perspective\, categorical traces allow one to study character sheaves through monodromic Hecke categories. I will describe two models for these categories: a geometric categorification in terms of parity sheaves and an algebraic categorification in terms of Soergel bimodules. A key advantage of these models is that they are tightly controlled by p-Kazhdan–Lusztig combinatorics. This paves the way for a more algebraic study of modular character sheaves.
UID:152484-21913803@events.umich.edu
URL:https://events.umich.edu/event/152484
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261101T133035
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T170000
SUMMARY:Workshop / Seminar:How plabic graphs describe weakly separated collections
DESCRIPTION:Two k-element subsets I\,J of {1\,2\,…\,n} are weakly separated if the sets I\J and J\I (when drawn on a circle with vertices 1\,2\,…\,n) can be separated by a chord. A maximal weakly separated collection is a set of pairwise weakly-separated k-element subsets of {1\,2\,…\,n} that is not contained in any larger set with this property. This definition gives rise to natural combinatorial questions: How big is a maximal weakly separated collection? How many are there? How are they related to each other?\n\nI will outline how Oh\, Posknikov\, Speyer answered most of these questions via a bijection between maximal weakly separated collections in a positroid and move-equivalent plabic graphs. Along the way\, we’ll meet some fun combinatorial objects related to plabic graphs including bounded affine permutations\, Grassmann necklaces\, positroids\, and plabic tilings.
UID:154396-21917646@events.umich.edu
URL:https://events.umich.edu/event/154396
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261102T113259
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T170000
SUMMARY:Workshop / Seminar:ISRMT Seminar: On Hirota's discrete KP equation - from geometry to multiple bi-orthogonal polynomials
DESCRIPTION:Abstract: We generalize the well known connection between the Toda lattice equation\, Pade approximants and orthogonal polynomials to the level of the Hirota system. We first present incidence geometric meaning of the multidimensional consistency of the system and its relation to Zamoldchikov's tetrahedron equation. Then we show how Hermite-Pade approximants and multiple orthogonal polynomials provide certain solutions to the Hirota system and its linear problem. Finally\, we extend the construction to the case of bi-moments and quasi-determinants.
UID:153397-21915803@events.umich.edu
URL:https://events.umich.edu/event/153397
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:Off Campus Location
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261012T153958
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T171500
SUMMARY:Workshop / Seminar:LSA Transfer Information Session
DESCRIPTION:Join the LSA Transfer Recruitment Team for our virtual sessions where we will discuss LSA requirements\, transfer credit\, pre-transfer academic advising\, LSA opportunities and other transfer tidbits.\n\nRegistration is required. Register using link to the right
UID:141040-21916067@events.umich.edu
URL:https://events.umich.edu/event/141040
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Transfer Students
LOCATION:Off Campus Location
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261102T122103
DTSTART;TZID=America/Detroit:20261102T170000
DTEND;TZID=America/Detroit:20261102T190000
SUMMARY:Conference / Symposium:Maize & Blue Cupboard Volunteering
DESCRIPTION:Come help us during normal operating hours\; as well as\, unload our weekly Food Gatherers deliveries and stock our shelves! If you are outside the U-M community\, please reach out to maize.blue.cupboard@umich.edu to sign up.
UID:102102-21917183@events.umich.edu
URL:https://events.umich.edu/event/102102
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Sessions
LOCATION:Maize and Blue Cupboard inside Betsy Barbour
CONTACT:
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