In this field, inspired by Banach's theorem, fixed point theory has been intensively studied [17 31], even in frameworks like intuitionistic fuzzy metric spaces [32 36].
In 1972, the number of solutions of nonlinear equations had been introduced and studied by Amann [7], and in recent years, nonlinear mapping fixed point theory and applications have been intensively studied in ordered Banach space [8 10].
On the other hand, in 1972, a number of solutions of nonlinear equations were introduced and studied by Amann [16]; and in recent years, the nonlinear mapping fixed point theory and application have been intensively studied in ordered Banach spaces [17 19].
Recently, fixed point and equilibrium problems (1.1) have been intensively investigated based on iterative methods; see [15 28].
In recent years, the nonlinear mapping fixed point theory and its applications have been intensively studied in ordered Banach spaces [21 26].
After removal of the culture medium, cells were fixed overnight at 4°C with 4% paraformadehyde and washed intensively (3 × 5 min) with 1 × PBS.
Furthermore, the fixed point theory in this kind of spaces has been intensively studied (see [5 14]).
The concept of fuzzy metric space was introduced in different ways by some authors (see, i.e., [1, 2]) and further to this, the fixed point theory in this kind of spaces has been intensively studied (see [3 11]).
After this pioneering work, G-metric spaces and particularly fixed points of various maps on G-metric spaces have been intensively studied; see [8 25] and also [26 29].
Despite the fact that researchers have been studying middle age intensively for decades, the term itself seems to have no fixed definition.
