On Monday, January 25, 2021 at 7:09:32 AM UTC-8 Nikos Apostolakis wrote:
> Dear Nils,
>
> [...] I think treating rational integers as integers is safe. Actually
> Sage does that
>
> sage: 8/2 in ZZ
> True
>
>
> So to have a function with integer input throw an error when you feed it a
>
On Monday, January 25, 2021 at 7:16:00 AM UTC-8 ... wrote:
> Is this the same as derivative(f(xp(x, y, z, t), yp(x, y, z, t), zp(x, y,
> z, t), tp(x, y, z, t)) , x, 2)?
>
> No, it is not. Look up "Multivariable Chain rule".
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>
> Secondly, what are you trying to collect? The D[0,0] terms or
> f(xp, yp, zp, tp), x, 2) which are two different things?
What is the difference between those 2?
> Given
> what you are trying to do I guess it is the first one, in which
> case you should have tried
>
> sage: term =
Dear Nils,
Thanks for the useful suggestions.
I probably used the wrong terminology, coercion vs conversion, sorry. What
I meant is simply that almost everywhere on Sage 8/2 is accepted as input
to a function that takes integer arguments, as it should IMHO. I
understand that preprocessing
