[0GW]↺↻
[0GX]↺↻
We also define this concept (already seen in [0BG]↺↻ for the case \(X={\mathbb {R}}\)).
[0GY]↺↻
[0GZ]↺↻
[0H0]↺↻
[0H1]↺↻
[0H3]↺↻
[0H5]↺↻
[0H7]↺↻
[0H9]↺↻
[0HD]↺↻
[0HG]↺↻
[0HJ]↺↻