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2015-06-19 08:33:10 -0500 | asked a question | Summing primes, cannot convert to int What can I do so that the following code works: Thanks in advance! |

2015-06-04 02:44:13 -0500 | commented answer | Protect built-in variables? Where is the lower case i..? Anyway, I know how to get them back (one can also use restore). It's just that I want to avoid strange bugs which can happen if I set the value of a built-in variable. |

2015-06-03 22:26:27 -0500 | asked a question | Protect built-in variables? Is there a way to protect built-in variables? This means that I get a warning if I use code like this: |

2015-05-26 01:41:33 -0500 | asked a question | How to find out if ideal is prime, principal, maximal in $\mathbb{Z}[X]$? Is there another way? |

2015-05-21 23:54:38 -0500 | asked a question | Fractional ideals for $\mathbb{Z}$ Why isn't it possible to construct fractional ideals for the integers $\mathbb{Z}$? But absurdly this works: What should I do? Use this crude workaround? |

2015-05-09 02:09:24 -0500 | asked a question | Find out if matrix is positive semidefinite What can I do to find out if a real or complex (symmetric/hermitian) matrix is positive definite (or better: positive semidefinite). More specifically, the following code doesn't work: It gives the error: |

2015-05-06 08:43:40 -0500 | asked a question | Factor out roots What could I do if I wanted a result like: And similar, if there were other roots like Thank you! |

2015-05-02 09:05:56 -0500 | asked a question | Finding complex roots So, what is the best way to find complex roots of polynomials? I only found that one: Should I use that? Isn't there an inbuilt function? Even PARI/GP has one, namely And why is the Thank you! |

2015-05-02 08:38:17 -0500 | asked a question | Can't use gp interface I'm running Sage 6.6 on Windows as a virtual machine in VirtualBox. I can't use the gp interface: Does anybody have an idea? Thank you! Ok, seems to work again after restarting... |

2015-04-30 18:50:34 -0500 | asked a question | Check if element is irreducible in algebraic number field If I have an algebraic number field is there a way to find out if an element is irreducible? There seems to be only a function to check if it is prime: But 7 is irreducible in $\mathbb{Q}(\sqrt{-13})$... how could I find that out? |

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2015-04-28 02:52:04 -0500 | asked a question | Dot-angle syntax Can somebody give me a hint where this kind of syntax is defined? I mean the Thank you. |

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2015-04-21 08:47:42 -0500 | asked a question | Alternative to piecewise functions? If I only need indicator functions (the function is 1 in an interval [a, b], 0 outside of it). Is there an alternative to piecewise functions (with all their issues like plotting), which I can use? Thank you! EDIT: Ok, I had an idea: That does pretty much what I want. |

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2015-04-15 15:27:12 -0500 | asked a question | Solution of quadratic forms If I have a quadratic form like (in the rational numbers)
Can SAGE give me a few solutions? Or even solutions in p-adic integers? |

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