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20170103 16:32:50 0500  commented question  get short name for QQ, RDF, AA etc thanks for the explanation! 
20170103 14:15:23 0500  asked a question  get short name for QQ, RDF, AA etc I wonder whether there is a way to get back the short name of the function of the various rings and fields like QQ, RDF, AA, RLF, RR, etc. as a string. For example But I am looking for something like: I guess I could predefine a dictionary like this: and then have a function But this seems a bit clumsy. Is there a better way to do this; or is there somewhere in the sage code such a dictionary already defined? The reason I am thinking about this is the following tiny bug: https://trac.sagemath.org/ticket/22132 
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20161209 05:00:48 0500  asked a question  Issues with .99999999999... Here is a result that I found surprising and I don't understand completely what corercian is causing it. What is going on? More to play with: and 
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20140703 04:04:16 0500  commented answer  combinatorial equivalence for Polyhedra / isomorphism for lattices perfect, thanks! I don't know how i missed this.. 
20140703 03:20:12 0500  asked a question  combinatorial equivalence for Polyhedra / isomorphism for lattices Is there an easy way to check whether two polyhedra are combinatorial equivalent, i.e. have have isomorphic face lattices. this does not work: In this case this would work: but what would be a good way to check this in general? 
20140703 03:14:08 0500  commented question  newton's method for multiple variables / arbitrary precision @vdelecroix: will do as soon as I have enough karma to do so.. 
20140703 02:07:10 0500  commented question  newton's method for multiple variables / arbitrary precision @vdelecroix: I figured out how to do this, see my answer below 
20140703 02:06:39 0500  answered a question  newton's method for multiple variables / arbitrary precision One easy way to this is to use mpmath.findroot! 
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20140628 20:15:57 0500  marked best answer  Combinatorial data for planar graph I am trying to get sage working with planar embedded graphs. The answer here was quite helpful, but I have a few more questions.
Ideally, for an embedded graph, I would like to obtain something like an oriented outer face and a list of oriented inner faces. For example for the graph below I want to have 
20140628 20:15:55 0500  marked best answer  access to printed output Maybe relating to this question: Access output from previous cells Assume I defined a function that takes a string and prints it: Now the output of the cell is just the word 'hello'. Is there any way to access this output, for example read it as a variable? The problem occurs when I have a MixedIntegerLinearProgram p and access it with p.show(). I then want to do something with the printed output of this command, e.g. write it to a file. 
20140628 20:15:36 0500  marked best answer  frozenset error when plotting polytopes: bug? I am having trouble understanding an error I get, when i try the following: It says: What is going on? Is this a bug? 
20140520 11:25:59 0500  asked a question  newton's method for multiple variables / arbitrary precision I am trying to find a numerical approximation with arbitrary precision to a real solution to a system of multivariate polynomial equations. I start out with an approximation which is somewhat close to solving the system, up to an precision of about 1e05. (Meaning that the equations that I try to evaluate are not zero, but smaller than 1e05 for my starting value) In this question is it recommended to use scipy's fmin_tnc method, which is what I did. This works out very nicely and it quickly gave a new solution which now solves my system with precision 1e07. In the Scipy doc it is stated that one can set the "epsilon" parameter, but not smaller than machine precision. So it seems like I can't get much more precision with this method?! Let's say I want to solve my system with precision 1e250. My questions are:

20140204 10:58:15 0500  marked best answer  frozenset error when plotting polytopes: bug? Its basically this bug: http://trac.sagemath.org/ticket/10046 We don't have an arbitrary precision polytopes, so sooner or later numerical errors in floating point numbers will give you the wrong answer. 