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Jan
25
answered Higher self-extension $\text{Ext}^i_{\mathcal{O}}(L(\lambda), L(\lambda))$ between two irreducible modules in BGG category $\mathcal{O}$
Nov
29
awarded  Necromancer
Nov
22
accepted Projective modules over rings without unit
Nov
13
awarded  Revival
Nov
7
comment What are the irreducible representations of the cyclic group $C_n$ over a real vector space $V$?
@NajibIdrissi Please consider converting your comment into an answer, so that this question gets removed from the unanswered tab. If you do so, it is helpful to post it to this chat room to make people aware of it (and attract some upvotes). For further reading upon the issue of too many unanswered questions, see here, here or here.
Sep
30
reviewed Leave Open Independent variables still independent with additional information?
Sep
30
reviewed Leave Open How many $n$-digit decimal sequences (using the digits $0 = 9$) are there in which the digits $1$, $2$ and $3$ all appear?
Sep
30
reviewed Leave Open For $n \geq 1$, show that $G= \{e^{2 \pi k i/n} : k \in \mathbb{Z}\}$ has $n$ distinct elements
Sep
30
reviewed Leave Open Show that expression is true or false using equations.
Sep
30
reviewed Leave Open Asymptotic behavior of functions
Sep
30
reviewed Reviewed Homeomorphism $(\mathbb{CP}^1)^m/S_m \overset{\sim}{\to} \mathbb{CP}^m$?
Sep
26
answered Weibel exercise 1.2.2.: kernels, monics, and monomorphisms are the same in $R$-Mod.
Sep
25
answered Quantum planes and quantum matrices.
Sep
17
answered Kleisli category examples
Sep
12
comment finding example for modular law if the condition C⊆B is necessary
possible duplicate of Sum and intersection of submodules
Sep
12
answered Linear transformation and characteristic polynomial
Sep
9
reviewed Close Showing countability without explicit bijection
Sep
2
answered Let $V_1,V_2$ be subspaces of $V$. If $\dim(V_1+V_2)=\dim(V_1 \cap V_2) + 1$ then prove that $ V1 \subseteq V2 $ or $V2 \subseteq V1$.
Sep
2
revised How do i show V is a linear subspace if it's defined like this?
deleted 3 characters in body
Sep
2
comment Projective objects in BGG category $\mathcal{O}$ are projective $U(\mathfrak{g})$-modules?
So they are infinitely far away from being projective. Thanks.