An user Spanish
says…

De
Adposition
  forma
Noun
  equivalente
Adjective
un
Determiner
  conjunto
Noun
  perfecto
Adjective
  es
Auxiliary
  un
Determiner
  conjunto
Noun
  cerrado
Adjective
  sin
Adposition
  puntos
Noun
  aislados
Adjective
.

Equivalently, a perfect set is a closed set without isolated points.

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