Changes between Version 15 and Version 22 of Ticket #15060


Ignore:
Timestamp:
05/26/18 07:28:08 (18 months ago)
Author:
gh-darijgr
Comment:

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  • Ticket #15060

    • Property Cc pelegm added
    • Property Milestone changed from sage-6.1 to sage-8.3
    • Property Stopgaps changed from to inconsistencyIssue
  • Ticket #15060 – Description

    v15 v22  
    55If my understanding of good terminology is correct, this should not be the case (see http://ncatlab.org/nlab/show/too+simple+to+be+simple ). Note that {{{Graph({}).is_tree()}}} correctly returns {{{False}}}.
    66
    7 Another issue is
    8 {{{
    9 sage: Graph({}).is_triangle_free()
    10 ---------------------------------------------------------------------------
    11 ValueError                                Traceback (most recent call last)
    12 <ipython-input-2-70aaa16d3aa5> in <module>()
    13 ----> 1 Graph().is_triangle_free()
    14 
    15 /usr/local/src/sage-5.13.beta1/local/lib/python2.7/site-packages/sage/graphs/graph.pyc in is_triangle_free(self, algorithm)
    16    2287                 B[v].add(map[u])
    17    2288             # map lengths 2 paths to bitsets
    18 -> 2289             BB = Bitset(capacity=N)
    19    2290             for u in self.vertex_iterator():
    20    2291                 BB.clear()
    21 
    22 /usr/local/src/sage-5.13.beta1/local/lib/python2.7/site-packages/sage/misc/bitset.so in sage.misc.bitset.FrozenBitset.__cinit__ (sage/misc/bitset.c:5023)()             
    23                                                                                                                                                                        
    24 /usr/local/src/sage-5.13.beta1/local/lib/python2.7/site-packages/sage/misc/bitset.so in sage.misc.bitset.bitset_init (sage/misc/bitset.c:1256)()                       
    25                                                                                                                                                                        
    26 ValueError: bitset capacity must be greater than 0
    27 }}}
     7[EDIT: removed "another issue" which has been fixed in the meantime.]