Corrigendum to: “On soft preopen sets and soft pre separation axioms, Gazi University Journal of Science, 27(4) (2014), 1077- 1083.”

The authors of [1] concluded in Example 1 that ? is a soft topology over ? = {?1, ?2, ?3, ?4} with respect to the set of attributes ? = {?1,?2,?3}. In fact, their conclusion is incorrect. For instance, the soft sets (?13, ?) and (?14, ?) are in the collection ? but (?, ?) = (?13, ?) ∪̃ (?14, ?) where (?, ?) = {(?1,{?1}), (?2,{?2, ?3, ?4}), (?3,{?1, ?2})} not belongs to the same collection ?. In order to achieve the goal of [1, Example 1], let ? = {?1, ?2, ?3, ?4, ?5} be a universe and ? = {?} be the singleton attributes set. Define the collection ? = {∅̃, ?̃, (?1, ?), (?2, ?), (?3, ?)}, where (?1, ?), (?2, ?) and (?3, ?) are soft sets over ? defined as follows.