xnor

@WheatWizard I was waiting for someone to comb through my 2016 answers in search of bounties, glad you're giving it a go!

it was a nice idea

ah right anything that maps singletons to themselves is doomed

I don't know, but I don't know how to find a collision either

@pxeger might it work to do lambda x:"0".join(x).join(x)?

@Randal'Thor that's amusing, thanks for telling me

Except, shouldn't the c in the wave equation be c^2?

I recognize all of them, I think

@LuisMendo Sorry for the late reply, this all sounds good. I'm also interesting in thinking about generalizations. I probably won't do anything though until I'm home in a couple of weeks. Do you have an e-mail or something I can use to contact you?

For collaborating on a short paper, sounds good to me, but what does that entail? Writing up a proof? I should warn you I'm on vacation now and might not have much time until a couple weeks from now.

@LuisMendo I don't have an OEIS account but assume I can make one?

And maybe the lexicographically first such sequence, though some condition would be needed to exclude the trivial f(n)=n

@Bubbler For your puzzling SE sequence question, metagaming from your half Fibonacci challenge made me notice that f(f(n)) is always a multiple of n

@flawr oh that one

@flawr would be happy to get an invite

54/500 :/

Where do I see the number?

Hmm, works for me. Does this link to the Sandbox post work? codegolf.meta.stackexchange.com/a/20703/20260

(Link to Adám's comment: codegolf.meta.stackexchange.com/questions/2140/…)

I fully agree. Writing a challenge is hard, fastest-code makes in 10x hard, and combining with other scoring makes it 10x harder still. Consider simplifying it. If you do think these are integral for your challenge, let it wait! There's no rush, you can come back to it after you've had some practice answering and writing other challenges, and with your experience you can make the best it can be.

"I highly recommend that you answer a few existing challenges before attempting the, frankly monumental, task of writing your own. This will give you an appreciation for well-specified challenges. I've been here for years, and have an order of magnitude more answers than challenges, and yes, my early challenges were problematic too."

@fasterthanlight I'm excited that you've joined this site and are enthusiastic about writing challenges, which I think we could definitely use more of nowadays. So let me pass on some great advice that Adám gave on another Sandboxed challenge, which I think applies in spirit if not in the exact specifics:

@Razetime Thanks for taking charge on this! The best-of was gathering dust for a while.

Though, id is weird in ways that suggest it's not a pure function in the mathematical sense, in that it can give different results each run, or for two variables holding the same number, as seen here.

@NobodyNeedsNames identity=lambda x:x

@Adám You might be thinking that id here is the identity function, whereas it's actually Python's built-in to get the "identity" of an object, that is its memory address.

You could also say that fixed lists are the minimal set that satisfies those properties. That is, the intersection of all such sets.

I gtg too

is this a cryptic?

hmm

i thought 9 was GOMES

i can't tell if 2 lives or not

go mate?

contact 9

contact 8?

you mean in answers?

contact 2

lol

contact 1

contact 7

contact 2

contact 1

ah, thought it was GO Us

I think 2 dies and 3 lives?

for 1, I guess GERRYMANDERING

hmm 4 is not golfed

yup :)

i have contacts on 1,2,3

contact 3

contact 2