BGA
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 Dec 5 accepted A conjecture about lines and points in the plane Dec 5 comment A conjecture about lines and points in the plane Ok, now I understand that my previous remark is not correct, and both the answers are good Dec 5 revised A conjecture about lines and points in the plane added 1 character in body Dec 5 comment A conjecture about lines and points in the plane Yes, I think the conjecture is the same, but how to prove it? Dec 5 comment A conjecture about lines and points in the plane I am not sure this is sufficient. You proved that for every finite $n$ you can find $n$ points satisying the property $(*)$, but this does not prove that you can find countably many points satisfying $(*)$ Dec 5 asked A conjecture about lines and points in the plane Nov 24 comment Structure of the space $X:=\{x \subset \mathbb{R}^3: |x| < \infty\}$, where $|x|$ is the cardinality of $x$ I answered you in the main section Nov 24 revised Structure of the space $X:=\{x \subset \mathbb{R}^3: |x| < \infty\}$, where $|x|$ is the cardinality of $x$ Answer to Daniel Rust Nov 24 asked Structure of the space $X:=\{x \subset \mathbb{R}^3: |x| < \infty\}$, where $|x|$ is the cardinality of $x$ Oct 15 comment A problem relative to skew-symmetric bilinear forms $B(u,v)=\sum_{i,j} u^*_j A_{ij} v_i$ Oct 14 revised A problem relative to skew-symmetric bilinear forms edited title Oct 14 comment A problem relative to skew-symmetric bilinear forms The problem is not so symple. Consider for example $v=(1, 1, 1, 1)$, for which $(v, v)=0$. Oct 14 asked A problem relative to skew-symmetric bilinear forms Oct 14 awarded Informed Jul 2 awarded Curious Jan 4 comment Conjecture: the function $d(x, y):=\frac{||x-y||}{\max(||x||, ||y||)}$ is a distance But this inequality does not seem to be easier to prove than the triangle inequality Jan 2 comment Conjecture: the function $d(x, y):=\frac{||x-y||}{\max(||x||, ||y||)}$ is a distance I agree @coffeemath, but we have not yet a rigorous proof, and this is strange, due to the "apparent" semplicity of the problem. Jan 1 comment Conjecture: the function $d(x, y):=\frac{||x-y||}{\max(||x||, ||y||)}$ is a distance Yes, I do not think it is a trivial problem Jan 1 awarded Commentator Jan 1 comment Conjecture: the function $d(x, y):=\frac{||x-y||}{\max(||x||, ||y||)}$ is a distance I already know this. The difficult case is $||x||\leq ||z|| \leq ||y||$.