sage: R.<q> = ZZ[]
sage: b = binomial(q,2)
sage: b
1/2*(q - 1)*q
sage: b.parent()
Symbolic Ring

especially when compared with

sage: binomial(q,1).parent()
Univariate Polynomial Ring in q over Integer Ring

John
-- 
Prof J E Cremona
Warwick Mathematics Institute
University of Warwick
http://www2.warwick.ac.uk/fac/sci/maths/people/staff/john_cremona/

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