My question https://math.stackexchange.com/questions/411987/collatz-like-5-x-pm-1-3 has been closed as "not a real question". I agree the question was insufficiently definite, and am grateful to the moderators and commenters (and to the person who added good math formatting to my post).
Actually rather than pose a new question, I had wished to introduce the 5n±1/3 Collatz-like function as a sub-comment under user Quanta's own, at question The $5n+1$ Problem
I could not find how to add my comment there however! I can see links/buttons to "edit" and to "reply", nothing to "add" a comment ! Is it really impossible to add new comments to the discussion at (non closed) questions, maybe, after some determined time, or am I just too dumb & missing something ?
I still am of the opinion than my variant has special "merits" beyond being one of an infinite class of Collatz-like iterations. I'd be glad if you helped me find the most proper way to have it introduced and discussed.
If it is not possible to add a short comment under Quanta's at the question mentioned above, then alternatively am I allowed to try to reformulate my closed "question" so it is shorter and avoids the vagueness criterion ? How am I supposed to submit a question so revised ?