253,006 reputation
25255528
bio website
location Cleveland Heights, OH
age 66
visits member for 3 years, 5 months
seen 18 mins ago

Professor emeritus at Cleveland State University. I’m a set-theoretic and general topologist with an interest in combinatorics. I’m also interested in linguistics, especially historical linguistics.


14h
revised Understanding a step in a double series proof
Converted image to text.
15h
revised how to place k rooks on the shaded squares of a m×n grid-like board
Fixed obvious typo in final case.
16h
revised Continuity of addition map with lower limit topology
MathJax, a little copy-editing.
17h
revised Least number of weights required to weigh integer weights
added 2906 characters in body
1d
revised Prove there exists dense open set
Typo and better explanation.
1d
revised Prove there exists dense open set
Typo.
1d
revised Prove there exists dense open set
added 62 characters in body
1d
revised Topological , Homeomorphic version of $|S \times S|=|S| $
added 254 characters in body
1d
revised Infimum of $\left\{\frac{n}{n^2+1}\:\:;\:n\:\in \mathbb N\right\}$ with a proof
added 566 characters in body
1d
revised Infimum of $\left\{\frac{n}{n^2+1}\:\:;\:n\:\in \mathbb N\right\}$ with a proof
added 161 characters in body
1d
revised How do you apply $u$-substitution to the integral $\int v\sqrt{2v^2+1}\,dv$?
MathJax, formatting, a little copy-editing.
1d
revised Use induction to prove summation
MathJax, converted image to text.
2d
revised Two proofs with possibly Baire category theorem about completness.
added 374 characters in body
2d
revised Enciphered Message with linear enciphering function.
MathJax, a little reformatting.
2d
revised Example of topological space where there is a point and a subset $A $: $x \in \overline A $, but no sequence in $A $ converging to $x $?
added 464 characters in body
Nov
25
revised Is the following set path connected?
added 115 characters in body
Nov
25
revised Is the following set path connected?
added 115 characters in body
Nov
24
revised Binomial coefficient in closed form problem
Replaced image with text.
Nov
24
revised Constructing almost disjoint families
Spelling of Mrówka.
Nov
23
revised baire category and the union of dyadic balls of rational center
Spelling of dyadic.