Apparently, this user prefers to keep an air of mystery about them.
46 Are there any Turing-undecidable problems whose undecidability is independent of the Halting problem? jun 16
30 A riddle for 2015 jan 2
18 Notation of the differential operator jul 22
13 Why is an equation necessarily dimensionally correct? apr 13 '14
9 Topological Hangman dec 16