开滦(集团)唐山矿业公司  tangshan mining company; kailuan group

开滦集团吕家坨矿业公司  lujiatuo mining branch; kailuan group

集团—集团凝聚  Cluster-cluster aggregate

紧闭子集集开子集  compactly closed subset compactly open subset

(τi,τj)-正则开集  i,τj)-regularly open set

b-I-开集  b-I-open sets

F强半开集  fuzzy strongly semiopen sets

I(r)-开集  I(r)-open Set

I-fuzzy正则开集  I-fuzzy regular open set

Ir-开集  I_r-open Set; Ir-open Set

j-fuzzy拟开集  j-fuzzy preopen set

LF-r开集  LF-r open set

L-fuzzy半开集  L-fuzzy semi-open sets

LF正则准半开集  LF regularly pre-semiopen set

L-smooth r-半预开集  L-smooth r-semi-preopen sets

L-smooth-半预开集  L-smooth r-semi-preopen sets

L-开集轮  open set wheel

p-开集  p-open Sets

R开集  R-open sets