Pascal dangling else: Oops and thanks!Edit

Hi Emil, Thanks for your recent reverts of my incorrect edits! I was being hasty and made a dumb mistake, which is even mentioned in the reference I found when I looked into it correctly (namely, can’t use a semi, have to use a block). I’ve fixed this at Dangling else and Pascal, this time with a reference – hope it looks good! As ever, feel free to contact me directly if you’d like me to fix anything, though of course that’s not necessary. Happy edits!

—Nils von Barth (nbarth) (talk) 15:35, 27 May 2013 (UTC)
All right, no problem.—Emil J. 12:09, 28 May 2013 (UTC)

Knuth definitionEdit

Hi. I will gladly state my point of view on that matter. But you must first start an NPOV-debate on the talk-page of the article. Sapphorain (talk) 22:16, 29 May 2013 (UTC)

Czech help neededEdit

Hello EmilJ, I'm contacting you because we need some Czech translators to help with the deployment of the new VisualEditor on cs.wikipedia. There are help pages, user guides, and description pages that need translating, as well as the interface itself. The translating work is going on over on MediaWiki: Translation Central. I also need help with a personal message for the Czech Wikipedians. If you are able to help in any way, either reply here, or head over to TranslationCentral. Thanks for your time, PEarley (WMF) (talk) 04:54, 18 July 2013 (UTC)

Speedy deletion nomination of File:Cite error math.pngEdit

 

A tag has been placed on File:Cite error math.png requesting that it be speedily deleted from Wikipedia. This has been done under section F10 of the criteria for speedy deletion, because it is a file that is not an image, sound file or video clip (e.g. a Word document or PDF file) that has no encyclopedic use.

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Pittsburgh AgreementEdit

Hi. I'm Myrtle. I'm very sorry to have mucked up this article (hopefully very temporarily). I'd like to invite you to take a look at the revision that is up presently. I meant to go back immediately when I saved the revision yesterday and do more work on it but I became distracted. I think the origin and occupation of the cosignatories are related to the agreement in that they are key as to why these particular people were present in Pittsburgh. Do you have more suggestions for improvement? Is there anything that is inaccurate or unclear? Let's make this a great article on a very important topic. Regards, Myrtle. Myrtlegroggins (talk) 08:28, 2 November 2013 (UTC)

Orphaned non-free image File:ML-plakat.jpgEdit

 

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The pronunciation of Czech ⟨ř⟩Edit

Hello. I've written something in the talk page of the article Czech phonology. I'd be really delighted if you would be so kind as to answer me. Thank you very much indeed, and greetings from Italy. Pio d'Ausonia (talk) 10:21, 8 September 2017 (UTC)

It's at the end of the section Pronunciation of ř. Pio d'Ausonia (talk) 10:21, 8 September 2017 (UTC)

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Function problemEdit

Hi! I saw that you contributed to Function problem in 2015, and I remember you are some expert in complexity theory. So, maybe you can help me to resolve the {{clarify span}} requests that I just have added. Thanks in advance! Best regards - Jochen Burghardt (talk) 12:48, 1 March 2019 (UTC)

I reformulated part of that section. I Hope it is now more understandable.—Emil J. 15:57, 12 March 2019 (UTC)
Yes, I believe to almost understand it now. Many thanks!
Your argument about NP generalizes to all classes starting with "N", doesn't it? But then, it isn't obvious to me how an arbitrary decision problem from P can be transformed into a function problem from FP. Unlike for the "N..." classes, there may be no kind of "solution" involved for P. For example, I don't see an FP analogue the P problem "given a number in decimal notation, is it divisible by 3 ?" - Jochen Burghardt (talk) 17:25, 12 March 2019 (UTC)
There is no claim that decision problems from P can be transformed to function problems from FP. (Well, they can, but not in a useful way.) The class FP is mentioned just to see how it differs from FNP.—Emil J. 18:05, 12 March 2019 (UTC)
Ok, I see; thanks again. I was mislead by the earlier version which seemed to claim a general transformation "F(.)", applicable to arbitrary complexity classes. This notation is still used ("F(NP)" in Function problem#Reductions and complete problems, and "F(NP cap coNP)" in Function problem#Total function problems), but now I see that the argument always is an "N..." class or a subset thereof. Maybe it would be helpful if that applicability restriction of "F(.)" was explicitly mentioned (e.g. by appending after the first paragraph of Function problem#Relationship to other complexity classes a sentence like: "Similarly, for every nondeterministic decision problem class Nxxx, there is a corresponding function problem class FNxxx, sometimes written as F(Nxxx)"). - Jochen Burghardt (talk) 09:29, 13 March 2019 (UTC)
The notation F(...) is nonstandard. I haven’t seen it outside Wikipedia, and I frankly have no idea what is   supposed to mean. Under any reading that I can come up with, it is not equal to TFNP, hence that claim seems to be simply bogus.
The bigger problem with this article is that while “function problem” has some currency, the more common and more precise name of the concept is “search problem”. Now I see that there is a different article of that name, which is even more confusing than this one. They should be merged.—Emil J. 12:02, 14 March 2019 (UTC)
The usual mess in Wikipedia outside the area of rock stars and sports events! "Search problem" seems to be a mixture of function problem (lead) and search algorithm (rest). I'll start a split/delete/merge discussion at Search problem; we should continue the discussion there. - Jochen Burghardt (talk) 12:36, 14 March 2019 (UTC)
Meanwhile, the page was deleted, then undeleted, and now some discussion is going on at Talk:Search problem#Undone deletion. You might be interested in that. - Jochen Burghardt (talk) 17:19, 10 June 2019 (UTC)

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Math proofs and copyrightEdit

You deleted a proof of quadratic reciprocity on the grounds of copyright violation? That is so weird! Reproduction of a mathematical result does not violate copyright! Then no book can reprint a proof of a previously proven theorem published in an article or mention a previously introduced concept if it was published in an article?! (cf. also preprints in arXiv)— Preceding unsigned comment added by Strecosaurus (talkcontribs) 20:24, 8 June 2021 (UTC)

You seriously misunderstand the concepts involved. Copying a large body of text verbatim is most certainly a copyright violation. Of course you can publish a proof of a previously proved theorem, but you have to write it in your own words. Just copying it is both illegal, and a violation of Wikipedia policies.—Emil J. 21:21, 8 June 2021 (UTC)
What does "in your own words" mean if referring to math equations (or a text consisting of 90% math equations)? [Especially if we're talking about a mathematical proof, which by definition you have to do in one certain very specific way only! What in the world would "in your own words" be here?! Your statement "Of course you can publish a proof of a previously proved theorem, but you have to write it in your own words." is flat out self-contradictory and incoherent!! Then it's not that proof (nor can you just "slightly alter" a math proof with it still being a proof, in the first place!), so you just cannot!] And how is it illegal but openly publishing on arXiv isn't? "Copying a large body of text verbatim is most certainly a copyright violation." - I understand in fiction/novels, but this would be really off in math - so one cannot present a formerly existing proof published somewhere ever again?!
Also, looking back at the revision history of this bit, it appears that it has existed for more than a year, with nobody objecting?
It's literally a string of math formulas, not some Warner Bros. copyrighted material, what in the..?! - How can that possibly be illegal to reproduce? - Never have I ever in my 7 years of editing Wikipedia seen anything as ridiculous; if you undo it again, I will undo it back, unless I hear a second opinion from someone more authoritative. — Preceding unsigned comment added by Strecosaurus (talkcontribs) 00:33, 9 June 2021 (UTC)

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Post lattice for clones containing constant functions?Edit

Hi @EmilJ: Thanks a lot for your beautiful diagrams at Post's lattice, which I've referenced many times.

I'd like to include a version of the lattice with just the clones containing all constant functions, i.e. UM, Λ, V, U, A, M, and ⊤, under Post's lattice#Variants. But I'd like it to be consistent with the other diagrams in the article. Do you have the source for the SVG files that you could direct me how to edit, or would you be interested in creating a diagram for that? Caleb Stanford (talk) 15:02, 5 May 2022 (UTC)

Update: I created my own file, and added it here: File:Post-lattice-constants.svg. Caleb Stanford (talk) 05:13, 12 May 2022 (UTC)
Sorry, I’m busy in real life at the moment, and didn’t have time to respond yet. If you are still interested to make the diagram visually consistent with my original diagram, it shouldn’t be too difficult, but it would have to wait for a few more days. —Emil J. 13:13, 12 May 2022 (UTC)
No worries and not a high priority! I'm fine with keeping it as is (not visually consistent), or if you or anyone else wants to update it that's fine too. Caleb Stanford (talk) 16:57, 12 May 2022 (UTC)