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Seminar

Graduate Student Seminar: q-de Rham cohomology and Habiro rings September 25, 2026 (01:00 PM PDT - 02:00 PM PDT)
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Location: SLMath: Eisenbud Auditorium, Online/Virtual
Speaker(s) Sin Hang Jason Yeung (University of Toronto)
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We first introduce Wagner’s construction of algebraic Habiro cohomology: a suitable q-Hodge filtration produces a q-Hodge complex that descends to the Habiro ring. Building on Talk 5, we then explain how THH over connective complex K-theory ku supplies such filtrations under appropriate hypotheses, and how equivariant structures give a homotopy-theoretic description of Habiro descent. The number-field case recovers the Habiro rings from Talk 4 and brings the arithmetic and topological perspectives together.

Suggested references

Wagner, q-Hodge complexes over the Habiro ring.

Wagner, q-de Rham cohomology and topological Hochschild homology over ku.

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