[sage-devel] [Fwd: [Om] PASCO 2007: News and 2nd Call for Papers]

2007-04-04 Thread David Joyner
I know this is coming up soon but thought some of you working on dsage might be interested in this. --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more option

[sage-devel] bug? quotients in CC(z)

2007-04-04 Thread Kyle Schalm
this is one of the strangest bugs i've seen. using sage 2.3, sometimes constructing quotients in the rational function field CC(z) freezes, and sometimes not. when i say freezes, i mean it justs sits there until i press ctrl-C. no error, no stack overflow... just sits and runs forever. once i

[sage-devel] nontransitive equality?

2007-04-04 Thread Kyle Schalm
perhaps there's been a discussion about this that i didn't pay attention to, but i just realized that equality (==) is not always transitive: In [109]: mod(2,5)==mod(2,10) Out[109]: True In [110]: mod(2,5)==mod(7,10) Out[110]: True In [111]: mod(2,10)==mod(7,10) Out[111]: False what is the r

[sage-devel] Re: bug? quotients in CC(z)

2007-04-04 Thread Kyle Schalm
oops, instead of > FractionFieldElement(z.parent(),(I-z),(z+1.8),reduce=false) i should have written > > FractionFieldElement(z.parent().fraction_field(),(I-z),(z+1.8),reduce=false) because that works. -kyle --~--~-~--~~~---~--~~ To post to this gro

[sage-devel] Re: nontransitive equality?

2007-04-04 Thread William Stein
On 4/4/07, Kyle Schalm <[EMAIL PROTECTED]> wrote: > perhaps there's been a discussion about this that i didn't pay attention > to, but i just realized that equality (==) is not always transitive: > > In [109]: mod(2,5)==mod(2,10) > Out[109]: True > > In [110]: mod(2,5)==mod(7,10) > Out[110]: True

[sage-devel] Re: nontransitive equality?

2007-04-04 Thread Kyle Schalm
> > I'm not sure what to say except: > (1) the definition of equality in SAGE is "equal images under a > canonical map", hmmm. ok. if i wanted to find out the semantics of some SAGE operator, where would i look? perusing the reference manual, i didn't see any discussion of this. perhaps ther

[sage-devel] Re: nontransitive equality?

2007-04-04 Thread William Stein
On 4/4/07, Kyle Schalm <[EMAIL PROTECTED]> wrote: > > I'm not sure what to say except: > > (1) the definition of equality in SAGE is "equal images under a > > canonical map", > > hmmm. ok. if i wanted to find out the semantics of some SAGE operator, > where would i look? perusing the reference ma

[sage-devel] Re: bug? quotients in CC(z)

2007-04-04 Thread William Stein
What do you think of the attached? The problem was that gcd of numerical polynomials, via the algorithm we use, doesn't always converge, so polynomials couldn't be reduced to lowest terms. The patch changes the behavior of SAGE so fraction fields over non-exact rings do not divide the numerator a