I am interested in knowing the generalized classifying spaces (related to Eilenberg–MacLane space $K(G,n)$ when $G$ is discrete) for explicit group examples ($G=$ the entries given at the top row) given below. Can someone fill in the Table? $$\begin{array}{c|c|c|c|c|c|c|} G & \mathbb{Z}^n & \m...

I am interested in knowing the classifying spaces $BG$ (related to Eilenberg–MacLane space $K(G,n)$ when $G$ is discrete) for explicit group examples ($G=$ the entries given at the top row) given below. Can someone fill in the Table? $$\begin{array}{|c|c|c|c|c|} \hline G & U(n) & SU(n) & O(n) &...

I take a look about Theory of Holors: A Generalization of Tensors but I never heard this term "holor" I thought that the generalization of the tensors were the supertensors or hypertensor like that A vector or tensor whose components are themselves tensors is very hard to find a good genera...

Find all integers $x$ and $y$ (not just positive) for which $\frac{x^2}{x-1}+\frac{y^2}{y-1}$ is an integer. This is a generalization of Find integers $a$ in $[1,2014]$ to get solutions in integers of $x+y=a, \frac{x^2}{x-1}+\frac{y^2}{y-1}=4$ Here is what I have come up with: The only solut...

The tag elementary-probability has been created recently. The tag-info is currently empty. Do we want/need this tag? I'd say that past discussions on meta indicate that tags are not based on level/difficulty of the question, but on the content. For example: Should we require a tag that which spe...

We have three ambiguous tags average, expectation and means. They are often used for probability and statistics problems. The tag expected-value has been synonymized with probability. The current tag excerpts and info for these three tags are not clear enough. The average tag includes arithme...