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20181215 13:55:50 +0100  answered a question  resolution stuck system polynomials order two I also raised a question on math.stackexchange about the solvability of my polynomial system. . The Groebner basis method is stuck as well because of the high order of one of the variables ($ch$ which is degree 15). 
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20181214 01:58:38 +0100  answered a question  Solve, elegant way ? Well, I wrote this shorter code : The output is :

20181213 21:47:04 +0100  asked a question  resolution stuck system polynomials order two I have three variables (ISP, ch, $n_C$). I have two equations. My aim is to solve a system of two equations to compute the values of ISP and ch according to $n_C$. My two equations are polynomials of order two. I put the equations in a framabin : https://framabin.org/p/?2ea1412d13d7f... I tried the solvers of sage and simpy but it does not work. I tried to use Groebner basis but I failed. 
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20181116 15:08:42 +0100  commented answer  Conversion from symbolic expression to polynomial stuck https://doc.sagemath.org/html/en/reference/rings/sage/rings/fraction_field_element.html (I found the page about the Fraction Field Elements.) AN is my numerator and AD is my denominator of my symbolic expression A. There is not the values of interest (mu and xi_3) in the denominator AD. How should I wrap the whole in the Fraction Field ? BTW, thank you very much :) 
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20181116 13:57:30 +0100  commented question  Conversion from symbolic expression to polynomial stuck https://framabin.org/p/?2417942055fc9fc9#Oenpb+BI567QXYcVCzjO4zkLRC0byQaNdhi2XW/CUkY= (I added a framabin where you can read the symbolic expression.) 
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20181116 13:02:24 +0100  asked a question  Conversion from symbolic expression to polynomial stuck I have a very long symbolic expression with six variables:
I call the expression AN. I want to convert it in a polynomial of two variables (mu and xi_3). I tried the following command: This works for simple expressions but the command remains stuck for the given expression. My aim is to get the monomials of the polynomial. mu and xi_3 are random variables and I want to compute the expectation of AN (E[AN]). Thus, I could substitute the expectations in the expression. AN is a numerator, so it is not a fraction. Moreover, I also tried simply_rational but it did not help to convert. Is there anyway to convert easily ? EDIT : https://framabin.org/p/?2417942055fc9fc9#Oenpb+BI567QXYcVCzjO4zkLRC0byQaNdhi2XW/CUkY= (I put the symbolic expression in a framabin.) 