In mathematics, a Ditkin set, introduced by (
Ditkin1939), is a closed subset of the
circle such that a
functionf vanishing on the
set can be approximated by functions φnf with φ vanishing in a neighborhood of the set.
References
Ditkin, V. (1939), "On the structure of ideals in certain normed rings", Uchenye Zapiski Moskov. Gos. Univ. Matematika, 30: 83–130,
MR0002012
In mathematics, a Ditkin set, introduced by (
Ditkin1939), is a closed subset of the
circle such that a
functionf vanishing on the
set can be approximated by functions φnf with φ vanishing in a neighborhood of the set.
References
Ditkin, V. (1939), "On the structure of ideals in certain normed rings", Uchenye Zapiski Moskov. Gos. Univ. Matematika, 30: 83–130,
MR0002012