hashes for derivatives of symbolic functions still collide

[burcin]

It seems that #6243 didn't fix things properly:

Thanks to those who worked on closing ticket 6243 regarding
derivatives as dictionary keys for the release of Sage 4.1.1.  It
appears that there's still a bug, though (see below).

Alex

----------------------------------------------------------------------
| Sage Version 4.1.1, Release Date: 2009-08-14
|
| Type notebook() for the GUI, and license() for information.
|
----------------------------------------------------------------------
sage: f= function('f',x)
sage: d= {}
sage: for i in [1..5]:
....:     print diff(f,x,i)
....:     d[diff(f,x,i)] = i
....:
D[0](f)(x)
D[0, 0](f)(x)
<boom>

Component: symbolics

Author: Burcin Erocal

Reviewer: Karl-Dieter Crisman

Merged: Sage 4.1.2.alpha4

Issue created by migration from https://trac.sagemath.org/ticket/6851

[burcin]

Author: Burcin Erocal

[burcin]

comment:1

Attachment: trac_6851-fderivative_hash_collision.patch.gz

I hope I have the right fix in pynac this time. attachment: trac_6851-fderivative_hash_collision.patch contains doctests for Sage.

I will post a new pynac package and review instructions soon.

[burcin]

comment:2

New pynac package available at #6993.

[kcrisman]

comment:3

This works fine. Positive review, pending of course review of the package.

[kcrisman]

Reviewer: Karl-Dieter Crisman

[sagetrac-mvngu]

Merged: Sage 4.1.2.alpha3

[sagetrac-mvngu]

Changed merged from Sage 4.1.2.alpha3 to Sage 4.1.2.alpha4

[sagetrac-mvngu]

comment:5

There is no 4.1.2.alpha3. Sage 4.1.2.alpha3 was William Stein's release for working on making the notebook a standalone package.