2021-07-07 10:20:44 +0100 received badge ● Notable Question (source) 2019-12-29 06:31:39 +0100 received badge ● Popular Question (source) 2017-12-26 22:03:01 +0100 received badge ● Student (source) 2017-12-20 11:26:41 +0100 asked a question Sage solve returns empty list I have very complex formula, and I have to solve that formula for one of variables (get some variable from expression). If I use solve() function is sage, it returns empty list, which is odd, but I found that it could be caused by too complex expression. So I managed to use sympy.solve(), but it returns exception. Here is part of my code:  k, u, v ,w , E, B, S, J, C1, C2 = var('k', 'u', 'v', 'w', 'E', 'B', 'S', 'J', 'C1', 'C2') #assumptions assume(B > 0) assume(S > 0) assume(J > 0) assume(k > 0) assume((u*E^2 + v*E + w) > 0) f1 = (S == 1/6*(4*E^3*u + 3*E^2*v)/B + 1/6*(2*E^3*u + 3*E^2*v + 6*E*w)/B - k) f2 = (J == E/B - k/(E^2*u + E*v + w)) #solve f1 and f2 for E E_S = solve(f1, E) E_J = solve(f2, E) #under our assumptions only E_S[2] and A_J[2] are real #so for that solutions lets find S f_S1 = (E_S[2].right() == E_J[2].right()) #show(f_S1) solve(f_S1, S) #returns [] import sympy sympy.solve(f_S1, S) #returns exception  I tried to rewrite to sympy in spyder as well, but computations didint finish in two days so I canceled it.