本文整理汇总了Python中sage.combinat.partition.Partition.centralizer_size方法的典型用法代码示例。如果您正苦于以下问题：Python Partition.centralizer_size方法的具体用法？Python Partition.centralizer_size怎么用？Python Partition.centralizer_size使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类sage.combinat.partition.Partition的用法示例。
在下文中一共展示了Partition.centralizer_size方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: _delta_irr_rec
# 需要导入模块: from sage.combinat.partition import Partition [as 别名]
# 或者: from sage.combinat.partition.Partition import centralizer_size [as 别名]
def _delta_irr_rec(p, marking):
r"""
Internal recursive function called by :func:`delta_irr`.
"""
if len(p) == 0:
return 0
if marking[0] == 1:
m = marking[1]
a = marking[2]
i = p.index(m)
pp = Partition(p._list[:i]+p._list[i+1:]) # the partition p'
N = (-1)**a* delta_std(
pp._list + [m+2],
(1,m+2,m-a))
for m1 in xrange(1,m-1,2):
m2 = m-m1-1
for a1 in xrange(max(0,a-m2),min(a,m1)):
a2 = a - a1 - 1
for p1,p2 in bidecompositions(pp):
l1 = sorted([m1]+p1._list,reverse=True)
l2 = sorted([m2+2]+p2._list,reverse=True)
N += (-1)**a2*(_delta_irr_rec(Partition(l1),(1,m1,a1)) *
spin_difference_for_standard_permutations(Partition(l2),(1,m2+2,m2-a2)))
return N
elif marking[0] == 2:
m1 = marking[1]
m2 = marking[2]
i1 = p.index(m1)
i2 = p.index(m2)
if m1 == m2: i2 += 1
if i2 < i1: i1,i2 = i2,i1
pp = Partition(p._list[:i1] + p._list[i1+1:i2] + p._list[i2+1:])
N = d(Partition(sorted(pp._list+[m1+m2+1],reverse=True))) / pp.centralizer_size()
# nb of standard permutations that corrresponds to extension of good
# guys
for p1,p2 in bidecompositions(Partition(pp)):
for k1 in xrange(1,m1,2): # remove (k1|.) (k2 o m_2)
k2 = m1-k1-1
q1 = Partition(sorted(p1._list+[k1],reverse=True))
q2 = Partition(sorted(p2._list+[k2+m2+1],reverse=True))
for a in xrange(k1): # a is a angle
N += _delta_irr_rec(q1, (1,k1,a)) * d(q2) / p2.centralizer_size()
for k1 in xrange(1,m2,2): # remove (m_1 o k1) (k2|.)
k2 = m2-k1-1
l1 = sorted(p1._list+[m1,k1],reverse=True)
l2 = sorted(p2._list+[k2+2],reverse=True)
for a in xrange(1,k2+1): # a is an angle for standard perm
N += (_delta_irr_rec(Partition(l1), (2,m1,k1)) *
spin_difference_for_standard_permutations(Partition(l2), (1,k2+2,a)))
for m in pp.to_exp_dict(): # remove (m_1 o k_1) (k_2 o m_2) for k1+k2+1 an other zero
q = pp._list[:]
del q[q.index(m)]
for p1,p2 in bidecompositions(Partition(q)):
for k1 in xrange(1,m,2):
k2 = m-k1-1
q1 = Partition(sorted(p1._list+[m1,k1],reverse=True))
q2 = Partition(sorted(p2._list+[k2+m2+1],reverse=True))
N += _delta_irr_rec(q1, (2,m1,k1)) * d(q2) / p2.centralizer_size()
return N