[sage-devel] Re: Automatic Differentiation - Taylor Arithmetics

2019-05-02 Thread rjf
You might be interested in this .. https://people.eecs.berkeley.edu/~fateman/papers/ADIL.pdf which is algorithm differentiation written in Lisp. Sage includes Lisp (underneath Maxima, for example) Manipulation of program source to produce other program source is routinely supported in Lisp, and

[sage-devel] Characteristic Classes - Implement Vector Bundles?

2019-05-02 Thread Michael Jung
Hey there, for the next step of implementing characteristic classes, I'd like to implement abstract vector bundles. 1) Do you agree? 2) How would you proceed in doing so? It seems like it's not an easy task at all (at least if you wish having all functionalities). I mean, for characteristic cla

[sage-devel] Re: Failing doctest in src/sage/rings/integer.pyx

2019-05-02 Thread jonathan.kliem via sage-devel
Update: The test just takes way too much memory for a doctest, I would think. Consider the following: sage: n = prod(primes_first_n(25)) sage: _ = n.divisors() This takes a good 3 GB of RAM and it does not appear to be a memory leak (the doctest claims this to be the problem on failure). I can