Wikidata:Property proposal/Alexander polynomial

Alexander polynomial

Originally proposed at Wikidata:Property proposal/Natural science

   Done: Alexander polynomial (P5350) (Talk and documentation)

Description	invariant of a knot. Use t as variable and list monomials in decreasing order.
Represents	Alexander polynomial (Q1634206)
Data type	Mathematical expression
Domain	knot (Q1188853)
Example	unknot (Q1188344) → $1$ trefoil knot (Q168620) → $t-1+t^{-1}$ three-twist knot (Q7797291) → $2t-3+2t^{-1}$
Source	http://katlas.math.toronto.edu/wiki/Main_Page

Motivation

This would improve our coverage of knots. − Pintoch (talk) 09:45, 7 June 2018 (UTC)

•  Support David (talk) 13:00, 7 June 2018 (UTC)
•  Weak support - we only have a few dozen knots in Wikidata right now, do we really anticipate having many more? Is it really justified to have a specific property just for this? Though I agree it's a good use of the mathematical expression datatype! ArthurPSmith (talk) 18:13, 7 June 2018 (UTC)
• @Pintoch, ديفيد عادل وهبة خليل 2:  Done ArthurPSmith (talk) 19:48, 21 June 2018 (UTC)