User talk:Opensofias/Archive 1

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Welcome to Wikidata, Opensofias!

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Best regards! --Tobias1984 (talk) 09:49, 15 May 2014 (UTC)[reply]

Welcome to Wikidata, Opensofias!

Wikidata is a free knowledge base that you can edit! It can be read and edited by humans and machines alike and you can go to any item page now and add to this ever-growing database!

Need some help getting started? Here are some pages you can familiarize yourself with:

Introduction – An introduction to the project.
Wikidata tours – Interactive tutorials to show you how Wikidata works.
Community portal – The portal for community members.
User options – including the 'Babel' extension, to set your language preferences.
Contents – The main help page for editing and using the site.
Project chat – Discussions about the project.
Tools – A collection of user-developed tools to allow for easier completion of some tasks.

Please remember to sign your messages on talk pages by typing four tildes (~~~~); this will automatically insert your username and the date.

If you have any questions, please ask me on [[User talk:|my talk page]]. If you want to try out editing, you can use the sandbox to try. Once again, welcome, and I hope you quickly feel comfortable here, and become an active editor for Wikidata.

Best regards! --Tobias1984 (talk) 09:49, 15 May 2014 (UTC)[reply]

Property[edit]

has facet polytope (P1312) is done. Feel free to request more properties. Should we start a WikiProject Mathematics on Wikidata? Would be good to gather imported items and frequently used properties. It also helps new users find information about the items they would like to improve. -Tobias1984 (talk) 09:49, 15 May 2014 (UTC)[reply]

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Thank you! --EGalvez (WMF) (talk) 20:31, 13 January 2017 (UTC)[reply]

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About this survey: You can find more information about this project here or you can read the frequently asked questions. This survey is hosted by a third-party service and governed by this privacy statement. If you need additional help, or if you wish to opt-out of future communications about this survey, send an email through EmailUser function to User:EGalvez (WMF) or surveys@wikimedia.org. About the Wikimedia Foundation: The Wikimedia Foundation supports you by working on the software and technology to keep the sites fast, secure, and accessible, as well as supports Wikimedia programs and initiatives to expand access and support free knowledge globally. Thank you! --EGalvez (WMF) (talk) 08:03, 24 February 2017 (UTC)[reply]

Arguable wikidata edit[edit]

Hello, Opensofias. I'm not sure that it's correct to say that lattice (Q595364) consists of (has part(s) (P527)) two semilattice (Q834585). It IS lower semilattice and upper semilattice but can contain multiple sublattices each of them is a lattice and thus a semilattice. I think it would be right to delete this statement (and did it) and find a more correct way to express the fact that lattice is a semilattice. VorontsovIE (talk) 12:28, 15 March 2017 (UTC)[reply]

oh, i see what you mean, i haven't thought about sublattices to be honest. i've done similar things in ring (Q161172), field (Q190109) and items like that.. i used "has part" because its upper and lower sublattices are "using" separate operations. it's different from how semilattices are both band (Q4177774) and commutative semigroup (Q27672715). there may be better ways to represent this, but i don't know any. i'm not a mathematician.. --opensofias (talk) 11:25, 24 March 2017 (UTC)[reply]

First of all, thank you for notification on my discussion page. I've created upper semilattice (Q29018101) and lower semilattice (Q29018102) (unfortunately they don't have wikipedia pages, because redirection pages can't be links for wikidata items) and made an hierarchy of subclass of (P279) statements. Now one can deduce that lattice (Q595364) is both upper semilattice (Q29018101) and lower semilattice (Q29018102) and each of the latter are semilattice (Q834585). Will try to do the same for other items. Thank you for links on them. upd: Unfortunately, it's really hard to represent properties of two operations for a ring and a field. VorontsovIE (talk) 14:08, 24 March 2017 (UTC)[reply]

hum, yeah, i wasn't so happy about this solution in the first place.
there isn't really an upper or lower semilattice without a lattice, right? and you can interchange them without the result being any less of a lattice. i still kind of like my "part of" thing. it's like a functional part not a mere subset. i wish i could put it in more precise terms.. i think we should bring fort this problem in Wikidata:WikiProject Mathematics. --opensofias (talk) 01:24, 26 March 2017 (UTC)[reply]

Sorry, I don't understand your objections yet. Both upper and lower semilattices are semilattices by definition. Lattice is a structure which is both upper and lower semilattice. And you can easily make an upper(lower) semilattice which isn't lattice. Three elements is enough for this (a > b; a > c; b not comparable to c; so any two elements have upper bound, but lower bound of b and c is undefined). Lattice doesn't contain semilattices, it is semilattice as a whole. Every element of a lattice is an element of both semilattices simultaneously. VorontsovIE (talk) 02:03, 26 March 2017 (UTC)[reply]

Classes of chemical compound[edit]

Hey. I've noticed that you're adding a lot of classes to chemical compound items. Keep in mind that there is no agreement in Wikiproject Chemistry how we should classify chemical compounds in WD (what data model should be applied and whether chemical compounds are classes or not) and if this should be done using instance of/subclass of or dedicated property. More info here and on the discussion page. There is, however, an agreement that compounds without fully defined stereochemistry (like DL-phenylalanine (Q27103475)) shouldn't be instances of chemical compound but instances of group of isomeric entities (Q15711994) (or its subclass). Best, Wostr (talk) 01:35, 28 October 2018 (UTC)[reply]

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