User contributions for 81.147.119.151

4 January 2014

• 00:3700:37, 4 January 2014 diff hist +5,106 N Class (set theory) No edit summary

1 January 2014

• 00:5700:57, 1 January 2014 diff hist +18,395 N Axiom of regularity →No infinite descending sequence of sets exists