/srv/conda/envs/notebook/lib/python3.7/site-packages/sympy/core/relational.py:470: SymPyDeprecationWarning:
Eq(expr) with rhs default to 0 has been deprecated since SymPy 1.5.
Use Eq(expr, 0) instead. See
https://github.com/sympy/sympy/issues/16587 for more info.
deprecated_since_version="1.5"
https://github.com/QuantEcon/quantecon-notebooks-python/pull/6