Presentations

Howe to translate Gelfand-Tsetlin Wednesday, August 12, 2020

video of the talk  

Soergel bimodules have natural manifestations in 3 different contexts: combinatorial (i.e. diagrammatic calculus), geometric (i.e. perverse sheaves on the flag variety) and representation theoretic (i.e. Harish-Chandra bimodules/category O).  

In each of these contexts, there are generalizations that might interest you:

  • on the combinatorial side, there is a categorification of the kth tensor power of C^n via KLRW algebras, studied by Khovanov-Lauda-Sussan-Yonezawa...
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3d mirror symmetry and its discontents Monday, August 10, 2020

video of the talk

One of the central topics of the interaction between QFT and math is mirror symmetry for 2d theories. This theory has a more mysterious and exotic friend one dimension higher, sometimes called 3d mirror symmetry, which relates two 3-dimensional theories with N=4 supersymmetry. For roughly a decade, I struggled to understand this phenomenon without understanding what most of the words in the previous sentence meant. Eventually, I wised up and based on work of Braverman, Finkelberg, Nakajima, Dimofte,...

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Authentic and Effective Assessment for Online Education, at online, Thursday, July 30, 2020:

I was invited to give a seminar on online education to the lecturers from many universities in Indonesia through the READI (Risk Management, Economic Sustainability, and Actuarial Science Development in Indonesia) program. I talked about creating connections, reducing cheating, and using assessments in online teaching.

The presentation was recorded and can be viewed here: https://www.youtube.com/watch?v=tjmRoy5k6hs&feature=youtu.be&t=396

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Teaching Circle -- Sue Chiblow, Diane Longboat, and Dr. Vandana Shiva, at University of Waterloo, Tuesday, July 14, 2020

This conversation with Vandana Shiva, Diane Kahontakwas Longboat, and Sue Chiblow was moderated by Jodi Koberinski.

CLICK ON THE LINK for a recording of this presentation: Teaching Circle July 2020

"Our paths crossed in the summer of 2016, when the TEK Elders Group asked Kahontakwas to arrange a meeting with Vandana Shiva at the office of the Chiefs of Ontario.

This talking circle was an opportunity for three powerful women, all voices for ecological justice, to...

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Comprehensive Exam Presentation Slides, at University of Waterloo, Tuesday, April 14, 2020:

Overview:

Ongoing colonialism and lack of self-determination for Indigenous peoples in the land known as Canada pose serious obstacles to confronting ecosystem disruption and extractivism, and to moving towards more sustainable paths for future generations, and improved relationships with all beings. With attention to Indigenist perspectives, and in the context of land use -- timber extraction in particular --  I critically analyze a) the literature at the nexus of Indigenous worldviews and western science-based settler epistemologies; and b) the literature on food...

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S(ymplectic) duality: where do we stand?, at Fields Institute, Toronto, Friday, February 7, 2020

video of the talk

Around 2007, Braden, Licata, Proudfoot and I came up with the slightly daft idea that certain singular symplectic varieties come in dual pairs whose definition we could not explain, with relations between them that we struggled to articulate, let alone prove. By 2014, we were able to produce at least a coherent list of properties we expected to match in dual pairs, the most striking being a Koszul duality between associated category O's.

This was...

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