Δ-related functions and generalized inverse limits

Sa？etak For any continuous single-valued functions \(f,g: [0,1] \rightarrow [0,1]\) we define upper semicontinuous set-valued functions \(F,G: [0,1] \multimap [0,1]\) by their graphs as the unions of the diagonal \(\Delta\) and the graphs of set-valued inverses of \(f\) and \(g\) respectively. We introduce when two functions are \(\Delta\)-related and show that if \(f\) and \(g\) are \(\Delta\)-related, then the inverse limits \(\varproj F\) and \(\varproj G\) are homeomorphic. We also give conditions under which \(\varproj G\) is a quotient space of \(\varproj F\)