1.For any two points in the normed space, there exist two points that form an equilateral triangle with them;

2.In a strictly convex normed space, these two points are unique;

3.On the unit sphere of a two-dimensional strictly convex normed space, the equidistant operator is additive;

4. There are sufficient and necessary conditions for the existence of equidistant extension problems in two-dimensional strictly convex normed spaces;

5. Further explore the ideas behind this issue