Greetings,
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from sympy import *
r=Symbol('r')
A=Function('A')(r)
B=Function('B')(r)
A1 = Derivative(A, r)
B1 = Derivative(B, r)
#eqs = [Eq(A*B, 0), Eq(B, 0)] #line1
#sol = dsolve(eqs, [A, B]) #line2
#eqs = [Eq(A1*B1, 0), Eq(A*B-1, 0)] #line3
#sol = dsolve(eqs, [A, B]) #line4
#eqs = [Eq(A1-B, 0), Eq(B1-B, 0)] #line5
#sol = dsolve(eqs, [A, B]) #line6
#print(sol)
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When I uncomment lines 1&2, I get an error:
File "C:\...sympy\solvers\ode\systems.py", line 2097, in dsolve_system
t = list(list(eqs[0].atoms(Derivative))[0].atoms(Symbol))[0]
IndexError: list index out of range
When I uncomment lines 3&4, I get an error:
KeyError: Derivative(B(r), r)
When I uncomment lines 5&6, I don't get an error.
Are these errors bugs?
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