[21J]↺↻
In this Section we will concentrate on the case \(X=ℝ\).
[2B3]↺↻
[0FR]↺↻
[230]↺↻
[22Z]↺↻
[0FS]↺↻
[0FT]↺↻
[0FV]↺↻
[22Y]↺↻
[237]↺↻