研究L-预拓扑空间中L-开集的一些近似形式(其中L是有逆合对应的C-格):θ-L-开集,δ-L-开集,α-L-开集以及β-L-开集。证明了(1)当L的最大元1是并既约元时L-预拓扑空间的连通性、θ-连通性、δ-连通性和α-连通性是等价的;(2)θLTop是LTopsθ、LTop以及LTopθ的反射满子范畴,δLTop是LTopsδ和LTopδ的反射满子范畴;(3)当格L为幂集格时αLTop是LTopsα和LTopα的余反射满子范畴;θLPTop是LPTopsθ、LPTop以及LPTopθ的反射满子范畴,δLPTop是LPTopsδ和LPTopδ的反射满子范畴。
The paper studies some approximation forms of L-open sets (i. e. θ-L-open sets, δ-L-open sets, α-L-open sets and β-L-open sets) in L-pretopological spaces for L a C-lattice with an order-reversing involution. It is proved that (1) Connectedness, θ-connectedness, δ-connectedness and α-connectedness of an L-pretopological space is the same if 1 is a join irreducible element. (2) θLTop is a reflective subcategory of LTopso, LTop and LTopδ, δLTop is a reflective subcategory of LTop'e, LTope, (3) aLTop is a coreflective subcategory of LTopsα and LTopα for L a powerset lattice ; θ LPTop is a reflective subcategory of LPTopso, LPTop and LPTopθ, and 3 LPTop is a reflective subcategory of LPTop'e and LTopδ.