258,252 reputation
25261536
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location Cleveland Heights, OH
age 66
visits member for 3 years, 6 months
seen 2 hours 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.


11h
revised Find the leftmost (most significant digits) of a large exponent calculation, say $99^{99}$
added 364 characters in body
14h
revised No sum of three numbers equals another number in set
A couple of typos and incomplete changes.
22h
revised Is this a criterion for continuity?
added 518 characters in body
22h
revised Complement Topology on $S^3$
Spelling of complement.
23h
revised infinite mape is $k-$colourable if and only if each finite subset of the map is $k-$colourable
Added missing requirement.
1d
revised Weak Hausdorff space not KC
Incorporated johndoe’s observation that weak Hausdorff spaces are $T_1$.
1d
revised How to exhibit the set of all the limit points of this subset of $\mathbb{R}^k$?
Corrected the special case $p=p_0$.
1d
revised Express σ using matrix notation
added 632 characters in body
1d
revised Express σ using matrix notation
edited tags
1d
revised Find the domain, co-domain and range of a function
added 330 characters in body
1d
revised Find the domain, co-domain and range of a function
added 351 characters in body
1d
revised Find the domain, co-domain and range of a function
MathJax
1d
revised Given a set $A$, how do I prove that there exists a set of all sets $x$ such that $\bigcup x=A$?
Corrected notation.
2d
revised A weaker Hausdorff topology on $\mathbb R$ with different system of compact subsets?
added 61 characters in body
2d
revised A weaker Hausdorff topology on $\mathbb R$ with different system of compact subsets?
edited body
2d
revised A weaker Hausdorff topology on $\mathbb R$ with different system of compact subsets?
edited body
2d
revised A weaker Hausdorff topology on $\mathbb R$ with different system of compact subsets?
edited body
2d
revised A weaker Hausdorff topology on $\mathbb R$ with different system of compact subsets?
edited body
2d
revised Munkres Section 10: How are these order types different?
added 1266 characters in body
2d
revised A question regarding non-(Lebesgue)-measurable sets in models of ZFC+$2^{\aleph_0}$=$\aleph_2$
edited title