Methods concerning cores in Partitions

[anneschilling]

The patch implements some new methods regarding cores in Partitions.

---

Apply attachment: trac_11700-partitions-as.patch

CC: @zabrocki

Component: combinatorics

Keywords: partitions, cores

Author: Anne Schilling

Reviewer: Mike Zabrocki

Merged: sage-4.7.2.alpha3

Issue created by migration from https://trac.sagemath.org/ticket/11700

[anneschilling]

Author: Anne Schilling

[zabrocki]

comment:2

I ran all tests and they passed. I give it a positive review except for a suggested change to is_core that I believe is shorter and faster:

def is_core( self, k ):
    return not k in self.hooks()

This changes the behavior for k=0 since the original version raises a "ZeroDivisionError: Integer modulo by zero" while this new version simply returns False.

[anneschilling]

Reviewer: Mike Zabrocki

[anneschilling]

comment:3

Hi Mike,

Thanks for your very first patch review! The suggested change is made (though for k=0 the output is True and not False).

Anne