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Janik

I am an everyday regular normal math student in Germany.

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12 If $A^{4}=I$, does this imply $A$ is invertible? Aug 29 '16
6 Example of non-isomorphic, Morita-equivalent semisimple Hopf-algebras Aug 23 '16
6 Are there more even or odd groups? Dec 25 '16
6 Why is $X^4-X^2+1$ reducible over $\Bbb F_5$? Feb 9 '17
6 To prove a set is a subring but not an ideal. Sep 10 '18
5 Is $[a,b]$ a finite or an infinite set? Dec 15 '16
4 Understanding a notation: what is $C^2(\mathbb{R})$? Dec 21 '16
4 Construct a field with $8$ elements question. Sep 14 '16
4 Subring in $\mathbb{Z}$ that is not an ideal. Sep 27 '16
4 How is $f(x) = x^3$, $F : \Bbb R \to \Bbb R$ an injective function? Aug 24 '16
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