Apparently, this user prefers to keep an air of mystery about them.
114 Does every non-empty set admit a group structure (in ZF)? jan 26 '10
17 A question about small sets of reals apr 15 '14
15 Does there exist an uncountable partition of a Polish space so that the union of any collection of blocks is Borel? aug 18
14 A question of Erdős jul 24
14 A problem of Keisler and Tarski sep 18
13 Sierpinski's construction of a non-measurable set dec 22 '14
12 On statements independent of ZFC + V=L jan 12 '10