Property talk:P7973

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quantity symbol (LaTeX)
symbol for a mathematical or physical quantity in LaTeX

Represents	quantity symbol (Q1401551)
Data type	Mathematical expression
Domain	individual quantity (Q71550118)
Usage notes	Any symbol typically used to reference this quantity. For the symbol used in the defining formula (P2534), use in defining formula (P7235).
Example	electric charge (Q1111) → $Q$ group velocity (Q217361) → $c_{\mathrm {g} }$ mass fraction of water (Q76379025) → $w_{\mathrm {H} _{2}\mathrm {O} }$
See also	unit symbol (P5061), quantity symbol (string) (P416), title in LaTeX (P6835), in defining formula (P7235)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P7973 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 2,027 Main statement 2,021 99.7% of uses Qualifier 4 0.2% of uses Reference 2 <0.1% of uses

[create Create a translatable help page (preferably in English) for this property to be included here]

Type “individual quantity (Q71550118)”: item must contain property “instance of (P31), subclass of (P279)” with classes “individual quantity (Q71550118)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P7973#Type Q71550118, SPARQL

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P7973#Scope, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P7973#Entity types

Without qualifiers: this property should be used without any qualifiers. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P7973#allowed qualifiers

Symbol/notation?

What's the difference from quantity symbol (string) (P416)? --Infovarius (talk) 20:56, 18 March 2020 (UTC)

This property (P7973) has datatype math, the other one has string, which was not enough to enter some symbols. Toni 001 (talk) 10:10, 19 March 2020 (UTC)

We are losing copyable information (math type can't be copy-paste directly). There's 2 variants: either to leave quantity symbol (string) (P416) or add qualifier Unicode character (P487) with older value. --Infovarius (talk) 13:32, 27 March 2020 (UTC)

One major glitch! This property doesn't allow cyrillic symbols! But there are usecases when Russians use cyrillic notation. --Infovarius (talk) 14:01, 27 March 2020 (UTC)

That's indeed an issue - LaTeX does not support all Unicode characters. Another shortcoming: I have not found a way to enter an upright \mu. In the long term we could consider a new datatype which allows directly entering MathML, which would probably solve all of those issues (an added benefit would be the possibility to enter semantic expressions - in addition to or instead of presentation syntax like LaTeX). Toni 001 (talk) 12:56, 30 December 2020 (UTC)

Label

The label proposed in the discussion included "(LaTeX)". This was omitted on creation, so I had to add it now. --- Jura 10:37, 28 March 2020 (UTC)

@Tacsipacsi: Fair enough, I had sort of conflated a label and a title in my mind. And my thought was indeed to have the 'proper' LaTeX logo shown, but \LaTeX doesn't seem to be supported in this context. Arlo Barnes (talk) 22:10, 18 December 2021 (UTC)

Italic and bold symbols

Following ISO 80000-1:2009 Quantities and units—Part 1: General (Q26711930), section 7.1.1: "... quantity symbols are always written in italic (sloping) type ...". This also applies to vector and tensor quantities, which in addition to being italic are printed bold (or with an arrow, see discussion above). To achieve both italic and bold font one can use \boldsymbol. I had originally entered symbols for vectors using \mathbf, but this makes the symbols upright. I'm going through all symbols now to use \boldsymbol instead. This will bring us a little closer to standard compliance.

Best wishes. Toni 001 (talk) 11:17, 30 December 2020 (UTC)