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@nobodyinperson@fosstodon.org
Here I am, entering an equation for the Monin-Obukov length (a turbulence parameter) into #SymPy, and SymPy is like: No!
WTF is happening here? Vars are just symbols with positive=True and real=True, except for L_MO and F_H which have positive=False.
Interestingly, if I constrain F_H to positive, the equation stays an equation and is not just False. 
EDIT: Aaah, positive=False means *negative* 
SymPy did its job! 
Describing problems helps! 
![Ipython Screenshot:
In[5]: sympy.Eq(L_MO,- (u_star**3) / (kappa * g/T*F_H/rho/c_p))
Out[5]: False](https://cdn.fosstodon.org/media_attachments/files/110/906/455/684/143/235/original/ce9e4819ba84e060.png "Ipython Screenshot:
In[5]: sympy.Eq(L_MO,- (u_star**3) / (kappa * g/T*F_H/rho/c_p))
Out[5]: False")
> SymPy is like: No!
Classic! I got this loads when calling `solve()` and just getting empty set … it’s the new "prolog No!"