열린집합,open_set

열린집합, 개집합, open set


// from mw
2차원에선 open set은 원판,disk,
3차원에선 open set은 공,ball.
open setcomplement(set_complement)은 닫힌집합,closed_set.




Twins:












MKLINK
극한점? limit_point 극한점,limit_point =극한점, =,limit_point . limit_point {
limit point
극한점


accumulation_point Srch:accumulation_point =,accumulation_point . accumulation_point {
accumulation point
집적점


Sub: complete_accumulation_point =,complete_accumulation_point . complete_accumulation_point { complete accumulation point WtEn:complete_accumulation_point https://encyclopediaofmath.org/wiki/Complete_accumulation_point Up: 완비성,completeness? }