Julian Kuelshammer
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 Apr 15 answered $R$ is isomorphic to a direct product of matrix rings over division rings Mar 24 answered How to define a quiver of basic and non-connected associative algebras 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 $V2 \subseteq V1$.