... Nonlinear conditions for coincidence point and fixed point theorems. Taiwan J Math. (in press)10. Du, WS: Nonlinear contractive conditions for coupled cone fixed point theorems. Fixed Point Theory ... byN (X) the family of all nonempty subsets of X, C(X) the family of allnonempty closed subsets of X andCB(X) the class of all nonempty closed boundedsubsets of X, respectively. For anyA, ... is a nondecre asing functi on or a nonincreasin gfunction, then is anMT-function. So the set of MT-functions is a rich class. Butit is worth to mention that there exist functions that...