bio  website  math.berkeley.edu/~ericp 

location  UCB  
age  27  
visits  member for  5 years, 6 months 
seen  14 mins ago  
stats  profile views  4,295 
Graduate student. Interested primarily in homotopy theory and the interactions of algebraic geometry with algebraic topology, but also in lots of other things, including Lie theory, mathematical physics, complex geometry, and graduating.
1d

reviewed  Approve Where to buy premium white chalk in the U.S., like they have at RIMS? 
2d

awarded  Popular Question 
Apr 30 
comment 
$\mathbb{Z}/2\mathbb{Z}$CW structure on spheres
All of them: antipodal actions preserve great circles, so picking any equator on S^n gives an inductive decomposition into S^(n1) and a single Z/2cell of the form D^n x Z/2. 
Apr 9 
awarded  Popular Question 
Mar 8 
comment 
Properties of coefficients of ring spectra
For any space $X$, the composite $$MU \to KU \to F(X_+, KU)$$ gives with a complex–oriented $E_\infty$–ring spectrum whose formal group law is multiplicative. Feeding in, e.g., a Moore space for X will get you plenty of torsion. This isn't a killer example though, as these are augmented $KU$algebras, and the augmentation cleanly separates the torsion from your other hypotheses. Still something you should disallow. // A recent result of Mathew, Naumann, and Noel (arXiv:1403.2023) gives some control over the behavior of torsion in $H_\infty$ settings. You may enjoy reading their main results. 
Feb 6 
comment 
Reconciling two viewpoints for spectra
I wrote some "nontechnical" notes that attempt to introduce the stable homotopy category by reasoning along the lines you mention. They have some deficits, but maybe you'll find they address your question: math.berkeley.edu/~ericp/teaching/Fall2013/msri/… . 
Jan 14 
reviewed  Approve A naive question about SGA4 
Jan 8 
reviewed  Approve Schrodinger equation with magnetic vector potential 
Jan 8 
reviewed  Approve $\epsilon$nearly isoclinic 
Dec 24 
revised 
When does the conormal bundle sequence split?
fixes obsoleted mathjax conventions 
Dec 4 
reviewed  Approve Find m most distant points from a set of n points 
Dec 4 
reviewed  Approve Famous mathematical quotes 
Nov 30 
reviewed  Approve Sets of coprime numbers 
Nov 9 
reviewed  Approve Isometries of hyperKähler manifolds 
Oct 24 
awarded  Yearling 
Oct 3 
revised 
What is Quantization ?
fixed mathjax error 
Sep 3 
reviewed  Approve When is a power of an indeterminate in an ideal with 2 generators? 
Sep 3 
reviewed  Approve When two determinantal ideals together generate a power of the maximal ideal? 
Aug 21 
reviewed  Approve The Arnold – Serre debate 
Aug 13 
reviewed  Approve Guessing a subset of {1,…,N} 