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2015-09-09 06:37:53 +0200 | asked a question | Forcing Symbolic Variables to Always be Real I am having a problem, I am trying to do algebra with a function of multiple variables, but Sage is assuming the variables could be complex numbers, which I do not want to do. I have a minimal working example that shows the problem. I am using the method discussed at this Google thread on the issue. I actually want to use the commented out equation, but I can't even get the behaviour right for a purely real (at least conceptually) function. The derivative of the argument of |

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