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You might see some necro-like-bumps from me. I'm trying to slowly edit/delete all my HINT answers from the site. I am also trying to stay away from giving hint answers in the future.

The last 10 answers I've posted:

  1. Zero sets in Mrówka spaces (22-Nov-2014)
  2. Regarding functions on $\omega_1$ (10-Nov-2014)
  3. Possible behaviours of the cofinality-of-neighbourhood function for topological spaces $X$ that are connected. (6-Nov-2014)
  4. Example of a $T_1$ space that does not have the property that every compact subspace of $X$ is closed. (5-Nov-2014)
  5. Why wouldn't someone accept Gentzen's consistency proof? (15-Oct-2014)
  6. Consistency of restricted forms of Martin's Axiom with the negation of the Continuum Hypothesis (8-Oct-2014)
  7. Spaces where all compact subsets are closed (2-Oct-2014)
  8. Is there always an equivalent metric which is not complete? (24-Sep-2014)
  9. Mary Ellen Rudin's proof that all metric space are paracompact (3-Sep-2014)
  10. Operators on the family of all subsets of a topological space that maybe generates a base for these family. (28-Aug-2014)

Yes, my answer-posting rate has slowed to a crawl. But I am generally happier with the questions I've been answering (and the answers I'm giving).


Nov
20
revised Reading Graphs to solve probability
rolled back to a previous revision
Nov
20
revised SAT Geometric Visualization
rolled back to a previous revision
Nov
20
revised Find area of shaded region in circle
rolled back to a previous revision
Nov
19
comment Jordan Cell as Jordan Form implies Commuting Matrices are in Polynomial
Comments are not for extended discussion; this conversation has been moved to chat.
Nov
19
revised Compactification of Completely Regular Space
rolled back to a previous revision
Nov
17
revised Conditional iterations constant.
edited tags
Nov
17
revised The splitting field of $x^4-4$
mainly, removed the "slitting" tag.
Nov
17
comment Epimorphisms detect structure-preserving maps
Comments are not for extended discussion; this conversation has been moved to chat.
Nov
15
comment Construct an inner product space $X$ and a proper, closed subspace $Y$ of $X$ such that $Y^\perp = \{ 0 \}$.
Comments are not for extended discussion; this conversation has been moved to chat.
Nov
15
comment Is $0$ transient, positive recurrent or null recurrent?
Comments are not for extended discussion; this conversation has been moved to chat.
Nov
14
comment Metric Space and Uniformly Continuous Functions
@user151852: If $A = (0,2)$, then the function $f_{1}$, for example, is not (uniformly) continuous. This then implies that this set $(0,2)$ cannot be an example of set satisfying the criteria of the question. (And, yes, the open subsets of $A$ are of the form $A \cap B$ where $B \subseteq \mathbb{R}$ is open. There are subsets of $\mathbb{R}$ where every point is isolated: e.g., $\mathbb{Z}$ and $\{ \frac{1}{n} : n \geq 1 \}$. But not even all of these will work.)
Nov
14
comment Olympiad Algebra Problem
This question is from the current USAMTS Round Two problem set (problem 5). It will remain locked until after the submission deadline of 8 Dec 2014.
Nov
14
comment If $ax + by ≤ bx + cy ≤ cx + ay$ then $b ≤ c$
This question comes from the current USAMTS Round Two problem set (problem 2). This question will remain locked until after the submission deadline of 8 Dec 2014.
Nov
14
comment If $ax + by ≤ bx + cy ≤ cx + ay$ then $b ≤ c$
@KirthiRaman: Ditto.
Nov
14
comment If $ax + by ≤ bx + cy ≤ cx + ay$ then $b ≤ c$
@Rafflesiaarnoldii: Please flag these when you see them.
Nov
14
comment Iscohedron Challenge
This question comes from the current USAMTS Round Two problem set (problem 1). This question will remain locked until after the submission deadline of 8 Dec 2014.
Nov
14
revised Iscohedron Challenge
rolled back to a previous revision
Nov
14
comment Three Dimensional Geometry Problem
This question comes from the current USAMTS Round Two problem set (problem 3). This question will remain locked until after the submission deadline of 8 Dec 2014.
Nov
14
comment Intersection Volume
This question comes from the current USAMTS Round Two problem set (problem 3). This question will remain locked until after the submission deadline of 8 Dec 2014.
Nov
14
comment Existence of a Pivot Point in Euclidean Geometry
Thinly disguised question from the current USAMTS Round Two problem set (problem 4). This question will remain locked until after the submission deadline of 8 Dec 2014.