Apparently, this user prefers to keep an air of mystery about them.
5 Is there a name for this identity involving series? aug 10 '12
1 Neumann series in an incomplete normed algebra dec 10 '11
1 Non-additive upper logarithmic density: $\ell^\star(X \cup Y) \neq \ell^\star(X)+\ell^\star(Y)$ aug 6