Nate Iverson
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 Sep 30 awarded Explainer Jun 3 awarded Yearling Jun 1 comment Terminology: Name for general, non-differential equations over $\mathbb{R}^n$ @PatrickDaSilva: en.wikipedia.org/wiki/Closed-form_expression Jun 1 comment Terminology: Name for general, non-differential equations over $\mathbb{R}^n$ What do you mean by a function $f:\mathbb{R}^n \to \mathbb{R}$ being a closed form expression. It's obvious when $n=1$, but for $n>1$ it is unclear imho. May 25 comment Is this predicate logic true? $\infty$ is not a real number. Saying "It's $\infty$" is not accurate. May 24 revised Find eigenvector of the linear operator added 1090 characters in body May 24 answered Find eigenvector of the linear operator May 22 revised Subfields of $\mathbb{Q}$ explained how to get the inverses May 22 suggested approved edit on Subfields of $\mathbb{Q}$ May 22 answered Two functions discontinuous, but sum continuous May 20 answered This limit supposed to be $0$ but I get $2$, why? May 9 comment Extending the Intersection of Subspace okay deleting my answer since the original poster is more interested in the small dimensional cases. Can you post the counter example if you're still interested in this problem. May 9 comment Extending the Intersection of Subspace Your dimensional identity is incorrect. $\dim (U_1+U_2)=\dim U_1+\dim U_2 - \dim(U_1 \cap U_2)$ May 6 comment When is a ring homomorphism also a R-module homomorphism? Very nice. It might be worth pointing out that the image $Im(\varphi)$ is an ideal (usually it's just a subring) and it's not a matter of $R$ being full of zero divisors but rather $Im(\varphi)$ must consist entirely of zero divisors if $\varphi \neq id$. May 6 comment Applications of simultaneous diagonalization of quadratic forms I don't think it's diagonalization unless $S^T=S^{-1}$ May 6 answered Absolute values don't work May 5 comment Applications of simultaneous diagonalization of quadratic forms What else do you know about S? Is it orthogonal by chance? May 5 answered Solving two varibles system equation above $\mathbb{C}$ May 3 revised Suppose that $F : X \longrightarrow Y$ is a function and $A$, $B$ are subsets of $Y$. Prove or disprove the following: edited in math May 3 suggested approved edit on Suppose that $F : X \longrightarrow Y$ is a function and $A$, $B$ are subsets of $Y$. Prove or disprove the following: