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2019-12-11 16:46:09 -0500 | commented question | The annulus problem in linear programming Can you draw a picture to show the solution is wrong? Also can you try different algorithms? Also you can directly use scipy to solve the problem. |

2019-12-11 16:21:21 -0500 | commented question | Solve set of equations with all unique values in sage You probably should use a SMT solver like z3. |

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2019-04-12 02:41:59 -0500 | commented answer | How to write a standalone cython script? Actually, I found that you can write a Cython program with .spyx extension and run it with sage. sage will compile it first and then run the compiled program. This is not efficient if we have to run the script many times. But it is fine for me since I am running a very long simulation and the compilation time of the program is negligible. |

2019-04-11 11:10:44 -0500 | asked a question | How to write a standalone cython script? To use Cython in sage, according to the document, you can either write Cython code in a sage notebook, load a .spyx file from command line, or create a .pyx file and add it to the sage library. My question is, can we write a standalone cython script and run it with sage? Just like a normal sage standalone script. |

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2018-12-06 09:15:34 -0500 | asked a question | How to substitute differential operator? Let's say I am taking derivatives of an expression involving unknow function. This gives the output How do I replace |

2018-12-06 09:15:21 -0500 | asked a question | Substitute differential operators in an expression. Let's say I am taking derivatives of an expression involving unknow function. This gives the output How do I replace |

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2017-12-30 19:12:49 -0500 | commented question | How to solve this equation with double square root? This has two solutions in $\mathbb C$, $\pm \sqrt{2\sqrt{3}-3}/2$. |

2017-12-30 19:00:00 -0500 | asked a question | How to solve this equation with double square root? I am trying to solve this equation in sage $$ \sqrt{-4 \, z^{2} + 2 \, \sqrt{-4 \, z^{2} + 1} - 1} = 0. $$ But when I try the code I get Is there any way to actually solve it in sage? |

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2017-06-21 02:36:32 -0500 | asked a question | How to simplify 1-cos(u)^2. I have tried But I still get |

2017-06-19 01:57:54 -0500 | asked a question | Finding zeros of zeta function. I am trying to make the following code work. There are actually 6 roots between 0 and 40. But find_root could not find any of them. Is there any walkaround? |

2017-06-06 03:38:46 -0500 | asked a question | How to get series expansion of function with symbolic parameter. Let $$h(t) = \frac{\sinh(t)}{t}.$$ Let $$ f_i(t) = h\left(\frac{t}{2^i} \right)^{2^i}, $$ where $i\ge 0$ is an integer. Is there anyway to get a series expansion of $f_i(t)$ without replacing $i$ with a fixed integer? |

2017-06-03 04:46:54 -0500 | asked a question | How to increase precision of numeric integraion? I am trying to evaluate an integral numeraically like this As you can see, increasing prec does not give me more precise result. Is there any way to get more digits ? |

2017-04-06 10:30:33 -0500 | asked a question | How to simplify fractions? I have the following expression $$ \frac{\left(-1\right)^{n} - 2 n - 1}{4 {\left(2 n + 1\right)}} $$ It clearly equals $$ \frac{\left(-1\right)^{n}}{4 {\left(2 n + 1\right)}} -\frac 1 4. $$ Is there anyway to make sage show this? |

2017-03-17 18:47:33 -0500 | commented answer | How to sort terms in symbolic expression of polynomial? How to convert a symbolic polynomial to a member of polynomial ring? Does sage has such a function? |

2017-03-15 11:24:42 -0500 | asked a question | How to sort terms in symbolic expression of polynomial? I have a symbolic expression in the following form How can I tell sage to print |

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