2018-02-17 01:55:10 +0200 | received badge | ● Nice Question (source) |
2018-02-16 23:25:43 +0200 | asked a question | Sage 8.1: jupyter does not start on MacOS Sierra I have just installed Sage 8.1 on MacOS Sierra. After I launch the application, I am told Jupyter did not start and I get offered to open the log. Doing so, here is what I get there
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2016-09-03 23:06:11 +0200 | commented question | Solution of ODE expressed with hyperbolic trigonometric function Thanks a lot for those hints: I had no idea I could get access to Maxima in such a way. As for my problem, from a human point of view, it is natural to want the "shorter" answer. I have just checked that Mathematica does actually produce the formula with tanh. Besides, the math behind exponentialize and demoivre must have an equivalent in hyperbolic trigonometry. |
2016-08-31 14:46:15 +0200 | received badge | ● Student (source) |
2016-08-31 14:41:34 +0200 | asked a question | Solution of ODE expressed with hyperbolic trigonometric function With Sage 7.3, consider The outcomes are $$\newcommand{\Bold}[1]{\mathbf{#1}}-\frac{m \log\left(\frac{h v\left(t\right) - \sqrt{g h m}}{h v\left(t\right) + \sqrt{g h m}}\right)}{2 \, \sqrt{g h m}} = C + t$$ $$\newcommand{\Bold}[1]{\mathbf{#1}}\left[v\left(t\right) = \frac{\sqrt{g h m} {\left(e^{\left(\frac{2 \, \sqrt{g h m} C}{m} + \frac{2 \, \sqrt{g h m} t}{m}\right)} + 1\right)}}{h {\left(e^{\left(\frac{2 \, \sqrt{g h m} C}{m} + \frac{2 \, \sqrt{g h m} t}{m}\right)} - 1\right)}}\right]$$ Nevermind $$v(t) = \sqrt{\frac{gm}{h}}\ \text{tanh}\left(\sqrt{\frac{gh}{m}}(t + m C)\right)$$ Thanks for any hint! |
2015-11-02 18:00:09 +0200 | commented answer | After upgrade to 6.9 we obtain SIGILL ... So anyway, my processors are the latest Nehalem. I guess the illegal instruction came with Sandy Bridge or Ivy Bridge. |
2015-11-02 17:57:29 +0200 | commented answer | After upgrade to 6.9 we obtain SIGILL ... It is a macro actually: the function is mpf_set_d. |
2015-11-02 17:56:32 +0200 | commented answer | After upgrade to 6.9 we obtain SIGILL ... Running sage with -gdb reveals the illegal instruction is in libmpir in function __gmpf_set_d. |
2015-11-02 16:56:53 +0200 | answered a question | After upgrade to 6.9 we obtain SIGILL ... Same problem on Mac Pro 2010 with X5690 processors. |