35,165 reputation
53074
bio website
location Vienna, Austria
age
visits member for 3 years, 4 months
seen 12 mins ago

If you have been following me around, you know that my main interests are general topology, set theory, and destroying users who post nothing but inane gibberish. The last is certainly not the least!


Projects I'd like to spend some time on:

  1. replace all occurrences of "Erdös" and "Erdos" by "Erdős"
  2. completely separate the and tags (i.e., empty this list).

Jul
17
reviewed Leave Closed I want to study Numerical linear algebra
Jul
16
comment Counterexample to “Urysohn Lemma for Hausdorff Spaces”
@MTurgeon: The Deleted Tychonoff Plank is completely regular, and therefore completely Hausdorff, however.
Jul
16
revised Counterexample to “Urysohn Lemma for Hausdorff Spaces”
added 156 characters in body
Jul
16
revised Counterexample to “Urysohn Lemma for Hausdorff Spaces”
rolled back to a previous revision
Jul
16
revised Counterexample to “Urysohn Lemma for Hausdorff Spaces”
deleted 682 characters in body
Jul
16
answered Counterexample to “Urysohn Lemma for Hausdorff Spaces”
Jul
16
revised An Uncountable language , A Model of $\mathbb{N}$, A Problem.
changed some
Jul
16
answered An Uncountable language , A Model of $\mathbb{N}$, A Problem.
Jul
16
comment Universal quantifiers that are interpreted “almost-everywhere”
The Stanford Encyclopedia of Philosophy has some information about generalised quantifiers (and a fairly extensive bibliography, although not all are from a mathematical point of view).
Jul
16
revised Numerical example of SVM
Added note.
Jul
16
comment Numerical example of SVM
This question has been subsequently cross-posted to stats.SE.
Jul
16
comment Numerical example of SVM
In the future please do not cross-post your questions to multiple sites. If you feel your question might be better received on another SE site, you can flag your question for moderator attention, explaining to which other site you wish your question to be migrated.
Jul
16
revised Sets as extremely trivial groups
edited tags
Jul
16
revised $f^+\mathscr{G}$ not a sheaf even if $\mathscr{G}$ is
removed link to pirated material
Jul
15
comment Question regarding permutations and combinations?
Please stop defacing your question. And do not re-ask the exact same question.
Jul
15
reviewed Leave Closed What is $\mathbb{R}$, $exactly$?
Jul
15
comment Question on proof that first countable, countable compact space is sequentially compact
This question cannot be answered because pertinent details are missing due to a now-dead link.
Jul
15
revised Question on proof that first countable, countable compact space is sequentially compact
dead link notification
Jul
15
comment How to reduce a graph via decomposition?
@frogeyedpeas: Possibly softwarerecs.SE. Even here I am not certain. At the very least, I have a feeling that a fairly thorough re-write might be in order to make it more acceptable even there. (And since that site is still in beta, migrations to it are highly discouraged.)
Jul
15
comment Can a space that is not locally finite be paracompact?
Perhaps you are just confused about the two meanings of "locally finite". As mentioned above, a topological space is locally finite if every point has an (open) neighbourhood which is finite. Examples include all discrete spaces, and all finite spaces. OTOH, a collection $\{A_i:i\in I\}$ of subsets of a topological space $X$ is locally finite if each $x\in X$ has an (open) neighbourhood $V$ such that the set $\{i\in I:A_i\cap V\neq\varnothing\}$ is finite; ie, each point has an (open) neighbourhood which meets only finitely many sets in the family. These notions are pretty much unrelated.