Hello Sympy, It appears there is a bug with the parse_expr running under evaluate(0)
mathystuff = "Union(Interval(-oo,0),Interval(-3,oo))" with evaluate(0): frmla0 = parser.parse_expr(mathystuff, local_dict, transformations=transformations) the error I am getting appears to be 'cannot determine truthvalue of Relational', which seems to me to mean it does not know how to arrange the terms with -oo without reducing it... It also fails if I replace oo with 30. But not if I replace -oo with -30. Hence the issue appears to be with -oo I am on 1.10.1 so if I need to update let me know, but it was a recent conda install. Thanks, Casey -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/f611bf26-90f2-4f44-97a3-acb5430fee4fn%40googlegroups.com.