2019-10-14 06:44:09 -0600 | received badge | ● Editor (source) |

2019-10-12 12:21:10 -0600 | commented answer | Hypergeometric Bug? Really?? (sigh) this type of thing is why I always double-check symbolic/numeric algebra packages (:(: and have to write "shells" (incidently it's wrong). |

2019-10-07 01:31:17 -0600 | received badge | ● Popular Question (source) |

2019-10-06 09:16:19 -0600 | asked a question | Hypergeometric Bug? The following code shows a (typical ?) failure. F([m,a,b;m,c;z) should and does for positive m; cancel m. but when m is negative "0" is declared prematurely --Juptyter code -- produces --Whereas Maxima code -- Produces -- |

2019-07-12 10:14:08 -0600 | received badge | ● Notable Question (source) |

2019-07-01 11:25:06 -0600 | commented question | Can SAGE generate embedded Kerr spacetime dynamic diagrams? I am also interested in a similar thing. I posted a question at: https://math.stackexchange.com/questi... My take is slightly different but if an answer is not forthcoming, are you interested in a joint project? |

2019-05-21 18:57:30 -0600 | commented answer | tangent space vector mapping Great! and thanks :) That in fact corresponds to usage/pullback of T_p vector I remember. I have looked around on the web in the last day and there seem's to be some obstacles to just yanking in down in general. One place has a greater than 1-page proof that it can sometimes be done. Yet another preconception too examine (: |

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2019-05-20 10:47:33 -0600 | asked a question | tangent space vector mapping Very simple question. 2) Taking : v = Tp.an_element(); print(v) |

2018-02-20 04:26:42 -0600 | received badge | ● Popular Question (source) |

2017-01-07 17:03:28 -0600 | commented answer | solve maxima? You are saying that sagemath can't give multiple solutions? Or is maxima wrong? In other words: what is the semantic difference between solve in sagemath and maxima? I know that maxima doesn't always find all the answers but I haven't had it give me a wrong one. I do know that underdetermined equation sets yield parametric or multiple solutions. |

2016-12-24 09:28:49 -0600 | asked a question | solve maxima? The following in Jupyter (and sage cloud) produces the wrong output. I do have an (extremely similar) maxima batch file that works fine. I sort of presume that maxima "solve" is not really called. If needed I can provide all files and stuff; either link or inline. Or if the correct way to use maxima/solve isn't obvious I can shorten up the generation of the solve argument by direct assignment. The last commented line is to prove that simpler problems yield the correct same answers in sagemath and maxima; when sagemath feels like. jupyter: %display latex T D-Beq1=k[0,0]; eq2=k[0,1]; eq3=k[1,0]; eq4=k[1,1]; eqd=A C-1 M/r)==0,eq4-1==0,eqd==0],[A,B,C,D]); eqd sol=solve([eq1+m==0,eq3-sqrt(2 sol ## -comment---solve([eq1+m==0,eq3-sqrt(2*M/r)==0],[A,B])Produces: Whereas : a maxima script produces ${\left[ \left[ A=-1 , B={{\sqrt{2} \cdot r \cdot \sqrt{{{M}\over{r}}}}\over{r-2\cdot M}} , C=0 , D=-1 \right] , \left[ A=1 , B=-{{\sqrt{2} \cdot r \cdot \sqrt{{{M}\over{r}}}}\over{r-2\cdot M}}, C=0 , D=1 \right] \right] }$ |

2016-12-12 10:01:39 -0600 | answered a question | quadraticform rational_diagonal_form? Q.matrix() ( i.e. the .matrix() operation) returns |

2016-12-12 09:34:50 -0600 | asked a question | quadraticform rational_diagonal_form? I don't understand the factor of "2" ; which also appears in my real problem. Here is the sample code from doc.sagemath.org/html/en/reference/quadratic_forms/sage/quadratic_forms/quadratic_form.html#sage.quadratic_forms.quadratic_form.QuadraticForm.rational_diagonal_form but Off by a factor of 2? The description says. Ray |

2016-11-30 10:10:06 -0600 | received badge | ● Student (source) |

2016-11-30 09:07:13 -0600 | commented question | "mesh=" juypter vs. -notebook Ignoring some installation differences and using strace: the "sage -notebook" path is ".../repl/rich_output/" whereas "sage -n jupyter" , like above and on my installation, is ".../repl/display/" although I haven't run strace in this case and just looked at the debug output. If it would help, I can make some straces available in dropbox; they are tediously long though. Or some way to control the /repl/xxx routing/option ?? |

2016-11-29 20:12:50 -0600 | asked a question | "mesh=" juypter vs. -notebook Perhaps I should send this to some devel or support group ? Comes up and executes: Correctly. Whereas: Fails with miscellaneous assertion type errors.
sagemath 7.3 in both cases. Edit (slelievre): I confirm I can observe this also with Sage 7.4. Here is the error message I get: |

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