EDB — 0QP

Exercises

1. [0QP] Topics:adherent point, accumulation point.

   Check that

   • Each accumulation point is also an adherent point, in symbols \(D(A)⊆ \overline A\);

   • if a point adhering to \(A\) is not in \(A\) then it is an accumulation point;

   So we obtain that \(\overline A=A∪ D(A)\). [ [0QQ]↺↻]