Self-discriptive system within time change. The simplest example of self-discriptive systems is the exponential increase. This is because the simplest “change” of a variable $x$ is a first derivative of
動的システムの定常状態，線形性，移動平均について．
State Space Model (SSM)
State Space Model(SSM) is widely used in the field requiring the sequential estimation or online learning. This model is effective if you consider a system having two different variables; one completely represents the actual state but cannot be observed and the other partially represents the actual state but can be observed.
Thinking of adaptation strategies for the capitalism