R􀀀convex functions

The concept of R􀀀metric spaces was introduced by Eshaghi et al. as an extension of metric spaces. In this paper, we investigate R􀀀convex and R􀀀concavefunctions and their relation to convex and concave functions.

کلیدواژه ها:

R􀀀metric spaces ، R􀀀convex functions and R􀀀concave functions.