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George

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 7 years, 1 month
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  • Last seen Apr 12 at 7:31

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18 Why is surjectivity “harder” than injectivity? Apr 15 '20
9 Determine a matrix knowing its eigenvalues and eigenvectors Jan 26 '15
6 Show if an abelian group $G$ has a $\mathbb Q$-vector space structure, then it is unique. Sep 20 '17
6 Show that $\dim_k(\mathfrak m^n / \mathfrak m^{n+1})=n+1$ whenever $0\leq n<m_P$, where $(\mathcal O,\mathfrak m)$ is the local ring of $P$ Sep 22 '18
5 The cohomology ring of an oriented closed $3$-manifold with $\pi_1=\mathbb Z$ May 6 '19
5 For a finitely generated ideal $I$, $I^2=I$ implies $A/I$ is flat over $A$ or $I$ is principal with an idempotent Mar 12 '19
5 The quotient space $S^3/S^1$ is homeomorphic to $S^2$ May 1 '17
5 Find all solutions to $x^2+54=y^3$ over the integers Apr 11 '17
5 A projective ideal in an integral domain is finitely generated Apr 26 '19
4 How is it geometrically justified that the tangent space to $y(y-x^2)=0$ is the whole plane? Feb 19 '19
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