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2016-08-14 23:20:00 -0600 | commented answer | Polar coordinates with negative angle Ohh... is that true even if I evaluate the first example and then edit it to change it into the second? (Not a very helpful error message, in that case...) |

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2016-08-12 13:54:29 -0600 | asked a question | Polar coordinates with negative angle Following the sagemanifolds tutorial I can make $\mathbb{R}^2$ with rectangular and polar coordinates: This uses the range $(0,2\pi)$ for $\theta$, excluding the positive $x$-axis. But if I try to use instead the range $(-\pi,\pi)$ for $\theta$, excluding the negative $x$-axis: SageMathCloud gives me "ValueError: Assumption is redundant". But strangely, SageMathCell doesn't complain at all. What is the problem? |

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2013-12-05 06:29:59 -0600 | commented answer | Symbolic functions without named variables Okay, I guess I see what the developers were thinking, even if I don't agree with it. (Wouldn't "coproduct" be a more appropriate term?) |

2013-12-02 16:50:22 -0600 | received badge | ● Supporter (source) |

2013-12-02 16:49:58 -0600 | commented answer | Symbolic functions without named variables I'm trying to understand this. Is the expression tree really necessary? It seems like a wrapper around a callable symbolic expression that knows how to reset the variables as needed might be sufficient for what I want. For instance, could you also overload function application, addition, etc.? |

2013-12-02 16:34:28 -0600 | commented answer | Symbolic functions without named variables Hmm... if it were really consistent about behaving this way, then I would expect `f+h` to be a type error, since you can't add elements of different rings. |

2013-12-02 16:31:29 -0600 | commented answer | Symbolic functions without named variables Thanks! Why do you refer to defining mathematical functions as "adding more semantics"? |

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2013-11-27 08:33:17 -0600 | asked a question | Symbolic functions without named variables Is there a way to define a symbolic function that can (e.g.) be differentiated, but doesn't remember the name of its input variable(s)? For instance, consider: Mathematically, f, g, and h, should all be the same function. However, Sage doesn't think so: I guess that this is happening because a "function" defined with |

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