Spheres are hard | A blog about math.

Posts

May 2, 2020
eta^2 = 0
Apr 30, 2020
The Weyl character formula
Apr 29, 2020
The Hodge conjecture
Apr 25, 2020
Confusion about factorization algebras
Apr 24, 2020
May nilpotence
Apr 21, 2020
The Browder bracket
Apr 20, 2020
Update
Apr 19, 2020
The secretary problem
Apr 11, 2020
The motivic Rees bundles
Apr 7, 2020
Infinite quaternionic projective space is not a H-space
Apr 6, 2020
Another nilpotence theorem
Apr 4, 2020
How to prove the nilpotence theorem
Mar 26, 2020
Representations = root data
Mar 23, 2020
Nonabelian Hodge theory
Mar 21, 2020
Deforming the de Rham space
Mar 19, 2020
D-modules
Mar 16, 2020
Moduli of parabolic subgroups
Mar 14, 2020
Faces of monoids
Mar 6, 2020
The transfer map and a result of Segal's
Feb 29, 2020
Stuff about partially ordered abelian groups
Feb 16, 2020
Barr-Beck for QCoh
Feb 12, 2020
The alpha family
Feb 8, 2020
Representations of partially ordered abelian groups
Feb 5, 2020
The Ran space
Feb 4, 2020
Anomalies, cobordisms, and the Atiyah-Patodi-Singer index theorem
Feb 3, 2020
Brauer-Wall spaces and algebraic K-theory
Jan 4, 2020
Filtrations
Dec 27, 2019
bo-resolutions
Dec 22, 2019
Exponential sums
Dec 18, 2019
Integers expressible as sums of two dth powers
Aug 26, 2019
E(n)-local spectra and the AHSS
Aug 21, 2019
The Turyn construction
Jul 26, 2019
Homotopy vs strict colimits
Jul 25, 2019
Preimages under the A-hat and Witten genera
Jul 24, 2019
The Witten genus at p=2
Jul 23, 2019
Chromatic splitting, redux
Jul 22, 2019
A question related to chromatic splitting
Jul 20, 2019
Quadratic reciprocity
Jul 18, 2019
The Witten genus is surjective at p=3
Jul 14, 2019
Weiss calculus and unstable thick subcategories
Jul 2, 2019
Calculus and chromatic theory
Jun 30, 2019
Structures on Moore spectra
Jun 22, 2019
TQFTs and height n
Jun 15, 2019
Twists of cohomology theories
Jun 13, 2019
Mahowald's eta_j family
Jun 11, 2019
Realizing A(1) equivariantly
Jun 8, 2019
The ABS orientation and the Witten genus
Jun 6, 2019
A love letter to E_2-rings
Jun 2, 2019
Invertible TQFTs
Jun 1, 2019
Dijkgraaf-Witten theory
Apr 18, 2019
Cohen-Moore-Neisendorfer and Ravenel's spectra
Apr 1, 2019
Mahowald-Ravenel-Shick and Anick's fibration
Mar 29, 2019
Hawking radiation
Mar 26, 2019
Certain finite Thom spectra
Mar 25, 2019
Complex orientations of Thom spectra
Mar 8, 2019
Maps between Morava E-theories
Mar 5, 2019
Defining the logarithm at small heights
Mar 2, 2019
Computing the logarithm at small heights
Feb 26, 2019
Tate spectra
Feb 23, 2019
Gonality of modular curves
Feb 21, 2019
The moduli of p-divisible groups
Feb 20, 2019
Divided powers and the sphere spectrum
Feb 16, 2019
Constructing truncated Brown-Peterson spectra
Feb 15, 2019
Lifting vector bundles
Feb 14, 2019
Additive degeneration and the Steenrod algebra
Feb 12, 2019
Hodge theory and Hopf invariant one