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2h
revised Homotopy Type of the Based Mapping Space $Map_*^{(k,l)}(\mathbb{C}P^2,BU(2))$
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2d
comment Homotopy Type of the Based Mapping Space $Map_*^{(k,l)}(\mathbb{C}P^2,BU(2))$
OK, I see your point. I might look at this again tomorrow.
Apr
29
answered Homotopy Type of the Based Mapping Space $Map_*^{(k,l)}(\mathbb{C}P^2,BU(2))$
Apr
29
revised Primitive ideal space and unitary dual of a [SIN] group - when are they Hausdorff?
Spelling and grammar in title
Apr
29
awarded  reference-request
Apr
28
answered Equivalence of different cohomology groups
Apr
27
comment Table of (integral) cohomology groups of K(Z,n)
There is a paper "Integral cohomology operations" by Stan Kochman that treats the stable case, and this agrees with the unstable case through a range. However, the answer is unpleasant. I think that all possible applications can be done more cleanly using a combination of $H\mathbb{Z}/p$ and $H\mathbb{Q}$, or sometimes by using $K$-theory or complex cobordism instead.
Apr
27
answered Character Values for Alternating Groups of degree $\geq 7$
Apr
26
reviewed Leave Open Reference for algebraic manipulation of sheaves
Apr
26
reviewed Close Rank diagrams of permutations $w \in S_{m}$ in the study of complete flag varieties
Apr
21
awarded  Nice Answer
Apr
20
comment Computer algebra system that test zero divisors in a quotient algebra
You'll need to give more information about $A$. What kind of presentation of $A$ do you have?
Apr
19
answered Exterior Powers of finite abelian group
Apr
18
comment Does the category of G-spectra know G?
I think that if you define $R_G=\Sigma^\infty_+G$ in the most obvious way as an orthogonal ring spectrum, then ring maps from $R_{\mathbb{Z}}$ to $R_G$ biject with $G$, so $R_G$ knows $G$. However, this is not so relevant because the category of $G$-spectra only determines the cofibrant replacement of $R_G$ in the category of rings in orthogonal $G$-spectra; that's an extra wrinkle that one has to worry about.
Apr
16
reviewed Close Real/complex addition, multiplication, and exponentiation from a categorical viewpoint?
Apr
15
answered (Geometric) Proof for the projective bundle formula in K-theory
Apr
12
revised H-space structures on non-sphere suspensions?
added 51 characters in body
Apr
12
answered H-space structures on non-sphere suspensions?
Apr
11
answered Closed formulas for topological K-theory?
Apr
1
comment Does $\mathbb C\mathbb P^\infty$ have a group structure?
If I remember correctly (which I do not guarantee), I once saw a comment by John Klein that he knew how to prove this, but he did not say how.