On 08/08/2018 00:26, John Cremona wrote:
On 7 August 2018 at 20:56, Vincent Delecroix <[email protected]>
wrote:
The global binomial function is to be blamed. The one
in arith works fine
sage: R.<q> = ZZ[]
sage: sage.arith.all.binomial(q,2)
1/2*q^2 - 1/2*q
sage: sage.arith.all.binomial(q,2).parent()
Univariate Polynomial Ring in q over Rational Field
Thanks. So if I put
from sage.arith.all import binomial
at the top then all works as expected.
The example you gave will work but not the following one
sage: var('m,n')
(m, n)
sage: binomial(m,n)
binomial(m, n)
This does leave the questions as to
why the symbolic version is imported but not this one.
The above example is the answer. You might want to manipulate
binomial as an abstract mathematical function.
Ideally the global
function would test the type / parent of the first input and use that to
decide which function to call. The current practice will be a cause of
bugs.
Did you fill a ticket on trac for the buggy type behavior?
Vincent
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