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DTSTART;TZID=America/New_York:20260915T090000
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DTSTAMP:20260723T182727Z
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UID:10003825-1789462800-1795280400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Lagrangian Floer Theory and Applications Program
DESCRIPTION:Lagrangian Floer theory and Applications Program \nDates: September 15–November 21\, 2026 \nLocation: CMSA G10\, 20 Garden St.\, Cambridge MA 02138 \nThis thematic program will focus on recent developments in Lagrangian Floer theory and applications.  These include the development of family Floer theory\, degeneration techniques\, Floer homotopy theory in the Lagrangian case\, Floer theory in prime characteristic\, and applications to problems in singularity theory\, geometry and dynamics. \nA one-week workshop will be held near the start of the program (September 28 – October 2\, 2026)\, with the same title as the thematic program. \nOrganizers: Denis Auroux (Harvard)\, Jonny Evans (Lancaster)\, and Chris Woodward (Rutgers) \n  \nTo express interest in attending the workshop or program\, and to apply for funding if available\, please fill out the form.  \nFunding from the National Science Foundation may be available for US-based graduate students and postdoctoral fellows. \n  \n \nimage: Water Sky Garden\, Vancouver\nDate: 31 January 2010\, 12:57:46\nSource: Studio Echelman\nAuthor: Peter Vanderwarker\, Studio Echelman \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/lft2026/
LOCATION:CMSA 20 Garden Street Cambridge\, Massachusetts 02138 United States
CATEGORIES:Programs
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260922T140000
DTEND;TZID=America/New_York:20260922T150000
DTSTAMP:20260728T155040Z
CREATED:20260630T154021Z
LAST-MODIFIED:20260728T155040Z
UID:10003954-1790085600-1790089200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:CMSA Special Seminar: Deformations to the Complex Plane\, Novel Asymptotic Techniques\, and the Large t- Asymptotics of the Riemann Zeta Function
DESCRIPTION:CMSA Special Seminar \n \nSpeaker: Thanasis Fokas\, University of Cambridge \nTitle: Deformations to the Complex Plane\, Novel Asymptotic Techniques\, and the Large t-\nAsymptotics of the Riemann Zeta Function \nAbstract: The Unified Transform (also known as the Fokas method) is a powerful new method for\nsolving boundary value problems for linear and for integrable nonlinear PDEs. For linear\nPDEs\, the relevant transform is based on appropriate deformations of certain integrals from\nthe real line to the complex plane. After briefly reviewing this transform\, it will be shown\nthat combining this idea with novel asymptotic techniques has recently led to unexpected\nand exciting results regarding the large t-asymptotic analysis of the celebrated Riemann zeta\nfunction. The following two results will be discussed. First\, a simple formula will be\npresented for the difference of the functions defining the error terms in two historic\nproblems: in Atkinson’s formula and in the formula for the Dirichlet divisor problem; it will\nbe shown that this difference equals π/ 2 plus a function which is simply related to the\nsquare of the Riemann zeta function. Second\, a remarkable integral identity satisfied by the\nRiemann zeta function will be presented; this identity is obtained from an earlier identity\nderived by the speaker via contour deformation in the complex plane. Making crucial use of\nnovel asymptotic techniques obtained jointly with Jonatan Lenells\, the asymptotic analysis\nof this integral equation gives rise to an interesting identity satisfied\, for large t\, by a sum\ngeneralizing the Dirichlet divisor sum. Also\, and more importantly\, it gives rise to a specific\nintegral transform suitable for the large t-asymptotic analysis of the Riemann zeta function. \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/fokas/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquia & Seminar,Special Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260922T150000
DTEND;TZID=America/New_York:20260922T170000
DTSTAMP:20260910T175006Z
CREATED:20260904T165515Z
LAST-MODIFIED:20260910T175006Z
UID:10004041-1790089200-1790096400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Mathematical Economics Seminar: Algorithmic Decision-Making
DESCRIPTION:Mathematical Economics Seminar: Algorithmic Decision-Making \nSpeaker: Ashesh Rambachan\, MIT \nTitle:  Human Decisions and Machine Predictions in Multistage Systems \nAbstract: Many high-stakes decisions go through successive stages of human review before a final decision is made\, complicating efforts to evaluate both the human decision-makers and algorithmic counterfactuals. We develop a framework for evaluating both humans and algorithms in such multistage systems and apply it to child protective services\,where human screeners first decide whether to investigate an allegation and human investigators then decide whether to open a case and provide services. The quasi-random assignment of human decision-makers identifies the effects of deploying algo-rithms throughout the system\, even though outcomes are selectively observed across stages. We find three main results when applying our framework to administrative data from Michigan’s CPS system. First\, conventional single-stage comparisons show that human screeners significantly underperform an equally selective algorithm buthuman investigators perform roughly as well as the algorithm. Second\, these conven-tional single-stage comparisons significantly overstate the gains of deploying algorithms throughout the system because of a double-counting problem\, where a case left unad-dressed at both stages is credited to the algorithm twice even though maltreatment can be prevented only once. Third\, there is meaningful heterogeneity across the human in-vestigators\, with the highest performers gathering and acting on information collected during the investigation itself that is unavailable to the algorithm. These results point to a broader feature of multistage systems\, where the scope for humans to complement algorithms grows as additional information becomes available. \n  \nSpeaker: Kosuke Imai\, Harvard University \nTitle: Triage Score: A Counterfactual Risk Assessment Instrument \nAbstract: Risk assessment instruments\, also known as “risk scores\,” are widely used in high-stakes decision-making settings such as medicine and the criminal justice system. A risk score predicts the likelihood of an undesired outcome if no intervention is made. Thus\, a sufficiently high score is often interpreted as a recommendation to intervene. However\, risk scores fail to account for what would happen if a decision-maker does intervene. This failure is problematic because effective decision making requires consideration of both or multiple potential outcomes. We propose “triage scores\,” which are based on additive counterfactual utilities and include risk scores as a special case. Unlike risk scores\, triage scores can incorporate counterfactual outcomes under alternative decisions\, enabling decision makers to incorporate a wide range of ethical and practical factors. We illustrate the use of triage scores with an application to our own randomized controlled trial evaluating a pretrial risk score. Our analysis demonstrates that triage scores are able to capture rich utility structures and yield substantively distinct results regarding policy evaluation and learning. \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/mathecon_92226/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Mathematical Economics Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260922T161500
DTEND;TZID=America/New_York:20260922T180000
DTSTAMP:20260921T145448Z
CREATED:20260729T190028Z
LAST-MODIFIED:20260921T145448Z
UID:10003986-1790093700-1790100000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Geometry and Quantum Theory Seminar
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar\n \n\nSpeaker: Dan Freed\, Harvard \nTitle: Path integral quantization of particles via probability (Part 2) \nAbstract: I will pick up where I left off last week.  The first half of the lecture will cover the general strategy of constructing a quantum system using Markov processes\, as described in Section 2.1 of Chatterjee’s book.  Then I will follow his Chapter 1 to apply it to a particle on the line with a potential. \n\n\n  \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/quantumgeo_92226/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
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