circular referencing
Circulatory references are often thought of as if they are bad
It's good if it's beneficial even if it's a circular reference.
At first glance, it may sound like a radical thought, "It's okay to make circular references."
However, in Dynamic systems, there is nothing strange about a value X being represented as $ X_{t+1}=f(X_t). It's not even strictly a circular reference because the time is off.
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