Great answer by our favorite bear.

So far, my heavily bountied, falsely trivial question DES f function injective for no fixed subkey? has attracted two incorrect responses, though one is promising. Come on!

Not that yes or no will change much, but it seems a question so simple and natural about the well-studied subject of DES S-boxes, with a necessarily yes or no answer, that I'm surprised I can't google it out.

Do old chat rooms just disappear?

@Maeher they get soft-deleted

do you want to look at the linked one?

(I undeleted it anyways)

@SEJPM Just casual curiosity.

good enough for an undelete :p

These rooms weren't deleted for good reasons, merely because they showed little activity and the systems thought "eh, nobody's using it, might as well delete"

hello

is anyone around?

I have a silly thing I would love to run by someone here