In https://github.com/sympy/sympy/pull/1699 in group_factors the theoretical
group factors for SU(N) are computed; for instance in test_group_factors
it is computed the group factor for the four-loop gluon Feynman graph
in eq.(1.1) of P. Cvitanovic "Group Theory"
On Saturday, June 29, 2013 7:18:30
On Sat, Jun 29, 2013 at 7:34 PM, Amit Saha wrote:
> Hello,
>
> This is more of a note of my findings and also just implicitly
> verifying whether I am doing the right thing.
>
> Problem: I want to find whether a point lies on a circle.
>
> I was hoping that like Linear entity objects, the circle/e
If it's a recurrence, just return the recurrence relation, and any
initial conditions to that relation (i.e., the same form as the input
to rsolve).
It might be useful to have a helper function that could take such a
relation and generate the nth term of each function, by the way.
Aaron Meurer
O
It seems I misremembered _eval_power. It handles when the object is
the base, not the exponent. So I'm actually not sure if there is a way
to override this. This ties in to the dispatch thing that is often
discussed here.
Aaron Meurer
On Wed, Jun 26, 2013 at 5:48 PM, F. B. wrote:
> I don't under
It's also possible that Mathematica automatically returns numeric
solutions when explicit ones can't be found.
Aaron Meurer
On Sun, Jun 30, 2013 at 5:48 PM, Stefan Krastanov
wrote:
> For the moment mathematica is more advanced than sympy both in finding
> symbolic solutions and in finding _multi
I don't know the physics well enough to know from your pseudo code.
sympy.physics.quantum knows about quantum mechanics though:
* Operators, states (bras, kets), commutators, anticommutators, outer
projects, tensor projects, inner projects
* The representation of those entities in different bases
For the moment mathematica is more advanced than sympy both in finding
symbolic solutions and in finding _multiple_ numeric solutions. This
explains most of the differences in results.
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So, I switched to the 'sympy.nsolve' method and got the approximate
solutions similar to Mathematica.
Yes, the system is nonlinear. While the method in the Mathematica code was
'NSolve', the solution set
returned was the same for the 'Solve' method.
Regardless, this helped a bunch. Thanks!
On S
@Brian, what would be the correct way to write something like
gluon(lorentz_index, su3_index) * group_generator(su3_index,
antispinor_index, spinor_index) * top_quark(spinor_index)
in the physics.quantum module?
On 30 June 2013 21:31, Brian Granger wrote:
> Extra bonus points if this stuff can
The equations are nonlinear and it seems that sympy is unable to solve
them. Maybe there is a way to instruct sympy how to deal with them but
I do not know how.
However, there is a very big difference between your mathematica code
and your sympy code. In mathematica you are calling `NSolve`, which
Hi Stefan,
Both of these solutions return an empty array. Where I should get an array
of possible solutions
similar to the output of the Mathematica version. Such as:
{{x -> -1.4282, y -> -1.08259, z -> -1401.51},
{x -> -6.67923, y -> -598.932, z -> -0.500032},
{x -> -2.17279 - 53.7467 I, y
f_1 = x + s1 + s2 + s5 - t1
this is all that you need to do if I understand your question correctly
Or if you wish, you can create 'Eq(right_hand, left_hand)' instances.
On 30 June 2013 21:09, Justin Carden wrote:
> Hi all,
>
> I'm trying to make the switch from Mathematica to Python in the lab
Extra bonus points if this stuff can be integrated with sympy.physics
or even better sympy.physics.quantum...otherwise we just keep creating
new corners of sympy that don't work together. I know it is easier,
but in the long run it is a horrible situation. The stuff in
sympy.physics.quantum is co
Hi all,
I'm trying to make the switch from Mathematica to Python in the lab, but
I'm running into a small problem binding the result space to a boundary.
Specifically, I'm trying to assign equality to each polynomial equation in
a system to a total t1,t2 and t3 to solve the system symbolically.
I've added all changes from this thread into:
https://github.com/sympy/sympy/wiki/Release-Notes-for-0.7.3
Feel free to polish it there.
For myself I think I only contributed the Gauss-Legendre and
Gauss-Laguerre points and weights, so I put it there as well.
On Sat, Jun 29, 2013 at 8:04 AM, Aar
On Sun, Jun 30, 2013 at 3:00 AM, Thilina Rathnayake
wrote:
> Looks like we will run into more and more trouble representing the
> solutions.
>
> The latest is that when solving quadratic Diophantine equation,
> A*x**2 + B*x*y + C*y**2 + D*x + E*y + F = 0, for the case B**2 - 4AC > 0,
> when we kno
Hi Stefan,
This is cool. I would be interested in having this in sympy. Long time
ago I wrote some diagram generating code for scalar diagrams:
https://github.com/certik/sympy/blob/wick/t.py
but I didn't have time to polish it up and send a PR. As you correctly
mentioned, there are lots of steps
On Sat, Jun 29, 2013 at 12:14 PM, Matthew Rocklin wrote:
> Ondrej got planet.sympy.org up and running again.
>
> There are now a lot of great blogposts by our GSoC students. Take a look!
>
> Kudos to Ondrej.
No problem. For reference, there were 3 issues why it didn't work:
1) The repository at
On Sat, Jun 29, 2013 at 1:52 AM, Sergey B Kirpichev
wrote:
> On Fri, Jun 28, 2013 at 09:38:35PM -0500, Ondřej Čertík wrote:
>> >> That being said, if projects like binstar (https://binstar.org/),
>> >> which was announced *yesterday*, take off and allow easy
>> >> installation on all platforms (in
Thank you Sergey for your reply.
On Sun, Jun 30, 2013 at 4:27 PM, Sergey Kirpichev wrote:
>
> On Sunday, June 30, 2013 2:49:20 PM UTC+4, Thilina Rathnayake wrote:
>>
>> We can solve this difference equation and output the general solution
>> perhaps.
>> Is there a way to solve recurrences in sy
On Sunday, June 30, 2013 2:49:20 PM UTC+4, Thilina Rathnayake wrote:
>
> We can solve this difference equation and output the general solution
> perhaps.
> Is there a way to solve recurrences in sympy? I searched and found there
> is a
> function called rsolve() but couldn't find it's documentat
We can solve this difference equation and output the general solution
perhaps.
Is there a way to solve recurrences in sympy? I searched and found there is
a
function called rsolve() but couldn't find it's documentation.
On Sun, Jun 30, 2013 at 2:30 PM, Thilina Rathnayake
wrote:
> Looks like we w
Looks like we will run into more and more trouble representing the
solutions.
The latest is that when solving quadratic Diophantine equation,
A*x**2 + B*x*y + C*y**2 + D*x + E*y + F = 0, for the case B**2 - 4AC > 0,
when we know a basic solution, all the other solutions can be represented as
a re
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