User contributions
- 13:19, 2 September 2013 (diff | hist) Talk:Equivariant homology (Ex) (top)
- 16:31, 31 August 2013 (diff | hist) Equivariant homology (Ex) (top)
- 16:30, 31 August 2013 (diff | hist) N Talk:Equivariant homology (Ex) (Created page with "<wikitex>; We can simply use the Borel-construction for equivariant homology. This takes an unequivariant homology theory $\mathcal{K}$ and defines for a group $G$ and any $G...")
- 13:13, 31 August 2013 (diff | hist) Equivariant homology (Ex)
- 13:12, 31 August 2013 (diff | hist) K-groups of oriented surface groups (Ex) (top)
- 13:11, 31 August 2013 (diff | hist) Borel conjecture in dimensions 1 and 2 (Ex) (top)
- 13:11, 31 August 2013 (diff | hist) N Talk:Borel conjecture in dimensions 1 and 2 (Ex) (Created page with "<wikitex>; Let us do the case of dimension $1$ first. Here it follows from the classification that every connected closed $1$-manifold is homeomorphic to a circle $S^1$. More...") (top)
- 13:08, 31 August 2013 (diff | hist) Talk:K-groups of oriented surface groups (Ex) (top)
- 13:03, 31 August 2013 (diff | hist) N Talk:K-groups of oriented surface groups (Ex) (Created page with "<wikitex>; First we look at the Atiyah-Hirzebruch spectral sequence. Recall that a closed orientable surface is either $S^2$ or aspherical. Hence if $G$ is not the trivial gr...")
- 12:46, 31 August 2013 (diff | hist) Reidemeister torsion (Ex) (top)
- 12:46, 31 August 2013 (diff | hist) N Talk:Reidemeister torsion (Ex) (Created page with "<wikitex>; Since the chain complex in question is finite and levelwise projective we know that contractibility is implied by being acyclic. And we see directly that if $r \ne...")
- 12:43, 31 August 2013 (diff | hist) K-group, first (Ex) (top)
- 12:43, 31 August 2013 (diff | hist) N Talk:K-group, first (Ex) (Created page with "<wikitex>; First we show that the determinant induces a well-defined morphism $$\xymatrix{\det:K_1( R) \ar[r] & R^\times.}$$ For this we recall that $K_1( R) = \mathrm{GL}( R...") (top)
- 12:41, 31 August 2013 (diff | hist) Kervaire-Milnor Braid (Ex) (top)
- 12:40, 31 August 2013 (diff | hist) Finitely dominated CW complexes (Ex) (top)
- 12:40, 31 August 2013 (diff | hist) N Talk:Finitely dominated CW complexes (Ex) (Created page with "<wikitex>; The obstruction to being homotopy equivalent to a finite complex lies in the group $\tilde{K}_0(\Z\pi_1(X))$ which is the trivial group if $\pi_1(M)$ is trivial. ...")
- 12:38, 31 August 2013 (diff | hist) Talk:K-group, zeroth (Ex)
- 18:26, 28 August 2013 (diff | hist) N Talk:Idempotents in group rings (Ex) (Created page with "Recall that by the representation theory of finite groups we have <wikitex> $$ \C\lbrack \Z/p\Z \rbrack \cong \prod_p \C $$ </wikitex> since all irreducibles are <wikitex>$1$<...") (top)
- 18:10, 28 August 2013 (diff | hist) Talk:Whitehead torsion (Ex) (top)
- 18:09, 28 August 2013 (diff | hist) N Talk:Whitehead torsion (Ex) (Created page with "We can compute that <wikitex>;$(1-t-t^{-1})\cdot(1-t^2-t^3) = 1$ </wikitex> so the element is a unit. The map <wikitex> $\mathrm{Wh}(\Z/5\Z) \to \Rr$</wikitex> can be describ...")