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2016-05-21 23:09:10 +0200 | answered a question | How can I alter default local sage configuration? I accepted the answer above. In the spirit of someone else having similar issue here is what worked for me. I found the sage documentation somewhat unclear. I took the following steps:
NOTE: I am assuming bash already knows the path to |
2016-05-19 21:42:45 +0200 | commented answer | How can I alter default local sage configuration? Yes I did. when I try |
2016-05-17 00:35:25 +0200 | commented answer | How can I alter default local sage configuration? Thank you. I didn't have an environment variable |
2016-05-16 01:27:01 +0200 | commented answer | How can I alter default local sage configuration? Thank you! I am using sage in a linux system. In my |
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2016-05-13 03:52:52 +0200 | asked a question | How can I alter default local sage configuration? I have installed sagemath on my computer. Now I would like to change some default configuration options. For example my default browser is Thanks in advance for your help! |
2016-05-01 18:36:45 +0200 | asked a question | Plotting an inequality in 3D region Ideally I would like to plot a region in 3D space which is defined by a bunch of inequalities. For example let us consider the region $R$ defined by $$ { (x,y, z): x \le 0 \text{ and } y \le 0 \text{ and } x+y \le z } $$. I am wondering what would be an easier way to do it. With my limited knowledge I came up with these two approaches. Approach 1 : Generate points in this region and plot them in 3D. Is there a way to extend the function in Approach 2 : Concatenate implicit -3D plots of functions of the form $ x + y - (z+t) $, where $t$ is a small positive parameter, for different values of $t$. Then plot all these simultaneously. I would appreciate any alternate way to do this or any improvements on these approaches. |
2016-03-04 04:58:09 +0200 | commented question | Sage: christoffel symbol calculation issue, help... In Python, which is the underlying base language of sage code block is determined by indentation. In your case the return statement should be at the same level (same column) as the for statement. |
2016-03-02 22:22:44 +0200 | commented answer | Sage Live CD USB The links seem broken today -in 2016. Is there any place that discusses a live USB sage installation? |
2016-03-02 00:59:18 +0200 | commented answer | An issue with Root systems in sage I didn't remember seeing the methods .to_ambient and to_vector in the documentation on Weyl Group/ root space realizations etc. It is probably because I was looking at the wrong places. Can you suggest where I should be looking? |
2016-03-01 15:47:57 +0200 | commented answer | An issue with Root systems in sage Thank you this helps me a lot! |
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2016-02-28 22:25:35 +0200 | commented answer | An issue with Root systems in sage This solves part of my problem. The other part is how can I simultaneously check id weyl group action on a simple root makes it positive or negative. The issue is if I redefine Weyl group in term of root lattice again I cannot make it operate on weight lattice. |
2016-02-28 14:50:27 +0200 | commented answer | An issue with Root systems in sage Thank you for your answer. But there is a problem with this approach. I have edited the question accordingly! |
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2016-02-28 04:45:10 +0200 | asked a question | An issue with Root systems in sage Here is a problem that I cannot seem to understand.
The output we get is as follows:
The issue is the root lattice is contained in the weight lattice but clearly D[2] is not contained in the lattice generated by F. Perhaps I am missing something simple. I need to write a program I would need the weyl group action on some weights and roots at the same time. How can this be done? Thank you for your time in advance. EDIT: Consider now the Weyl group action on weight lattice. We will continue using the notations above.
Gives an output
The only way I have been able to make it work is that
This is what I can get but the problem is
s2 f(F[2]) = (0,0,1).
So we are in a situation of the original problem again.
I need to calculate the Weyl group action on the fundamental weights. If there is a better way to do it I would like to know. |
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2016-02-22 18:35:49 +0200 | asked a question | Decomposing a Root vector into simple roots Is there a sage functions which does the following: Input = Root System / Ambient Lattice or Ambient space of irreducible (or even classical) Root System and a Root vector $v$ Output = a list containing the integers which expresses $v$ as a linear combination of simple roots. Thank you for your help. |