Nate Iverson
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 Sep30 awarded Explainer Jun3 awarded Yearling Jun1 comment Terminology: Name for general, non-differential equations over $\mathbb{R}^n$ @PatrickDaSilva: en.wikipedia.org/wiki/Closed-form_expression Jun1 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. May25 comment Is this predicate logic true? $\infty$ is not a real number. Saying "It's $\infty$" is not accurate. May24 revised Find eigenvector of the linear operator added 1090 characters in body May24 answered Find eigenvector of the linear operator May22 revised Subfields of $\mathbb{Q}$ explained how to get the inverses May22 suggested approved edit on Subfields of $\mathbb{Q}$ May22 answered Two functions discontinuous, but sum continuous May20 answered This limit supposed to be $0$ but I get $2$, why? May9 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. May9 comment Extending the Intersection of Subspace Your dimensional identity is incorrect. $\dim (U_1+U_2)=\dim U_1+\dim U_2 - \dim(U_1 \cap U_2)$ May6 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 $\varphi \neq id$. May6 comment Applications of simultaneous diagonalization of quadratic forms I don't think it's diagonalization unless $S^T=S^{-1}$ May6 answered Absolute values don't work May5 comment Applications of simultaneous diagonalization of quadratic forms What else do you know about S? Is it orthogonal by chance? May5 answered Solving two varibles system equation above $\mathbb{C}$ May3 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 May3 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: