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Issue 20006: Implement binary dihedral groups

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    "body": "<div id=\"comment:0\"></div>\n\nThis gives an implementation of a binary dihedral group as a matrix group and as a finitely presented group. Comes up in the McKay correspondence (for affine type D).\n\nCC:  @darijgr\n\nComponent: **group theory**\n\nKeywords: **binary dihedral, McKay correspondence**\n\nAuthor: **Travis Scrimshaw**\n\nBranch/Commit: **[`b46f15a`](https://github.com/sagemath/sagetrac-mirror/commit/b46f15ad84c6fedf0f797bc265b0c389e0c3a324)**\n\nReviewer: **Darij Grinberg**\n\n_Issue created by migration from https://trac.sagemath.org/ticket/20006_\n\n",
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This gives an implementation of a binary dihedral group as a matrix group and as a finitely presented group. Comes up in the McKay correspondence (for affine type D).

CC: @darijgr

Component: group theory

Keywords: binary dihedral, McKay correspondence

Author: Travis Scrimshaw

Branch/Commit: b46f15a

Reviewer: Darij Grinberg

Issue created by migration from https://trac.sagemath.org/ticket/20006


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Description changed:


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Branch: public/groups/binary_dihedral_group-20006


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0982a7fImplemented binary dihedral groups.

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Branch pushed to git repo; I updated commit sha1. New commits:

ad3414emanual merge into 7.4
32f5f78review

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comment:4

Reviewed. If it LGTY, then it LGTM! Cannot test though, since something's fucked up on this machine:

dgrinber@math-vinh203b-1:/home/dgrinber/sage-7.4.beta2 $ sage -bt src/sage/groups/matrix_gps/binary_dihedral.py
python -u setup.py install
Updating Cython code....
Enabling Cython debugging support
************************************************************************
Traceback (most recent call last):
  File "setup.py", line 604, in <module>
    run_cythonize()
  File "setup.py", line 596, in run_cythonize
    'profile': profile,
  File "/usr/lib/sagemath/local/lib/python2.7/site-packages/Cython-0.23.4-py2.7-linux-x86_64.egg/Cython/Build/Dependencies.py", line 778, in cythonize
    copy_to_build_dir(dep)
  File "/usr/lib/sagemath/local/lib/python2.7/site-packages/Cython-0.23.4-py2.7-linux-x86_64.egg/Cython/Build/Dependencies.py", line 776, in copy_to_build_dir
    shutil.copy(filepath, mod_dir)
  File "/usr/lib/sagemath/local/lib/python/shutil.py", line 119, in copy
    copyfile(src, dst)
  File "/usr/lib/sagemath/local/lib/python/shutil.py", line 83, in copyfile
    with open(dst, 'wb') as fdst:
IOError: [Errno 13] Permission denied: u'/usr/lib/sagemath/src/build/cythonized/sage/ext/ccobject.h'
************************************************************************
Error building the Sage library
************************************************************************
make: *** [sage] Error 1

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Reviewer: Darij Grinberg


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comment:5

LGTM. Thank you.


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comment:7

Documentation doesntt build


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Changed commit from 32f5f78 to b46f15a


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Branch pushed to git repo; I updated commit sha1. New commits:

e4356beMerge branch 'public/groups/binary_dihedral_group-20006' of git://trac.sagemath.org/sage into public/groups/binary_dihedral_group-20006
b46f15aAdding binary_dihedral.py to the doc.

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comment:9

Occurred because I forgot to add the new file to the documentation.


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comment:10

Thanks, Travis!

I still find it ridiculous that our documentation framework is more byzantine and less debuggable than the programming language itself.


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Changed branch from public/groups/binary_dihedral_group-20006 to b46f15a