Coupled and tripled coincidence point results under ...-invariant sets in ...-metric spaces and ...-...-admissible mappings

In this paper, we prove that coupled and tripled coincidence point theorems under ...-invariant sets for weakly contractive mappings defined on a ...-metric space are immediate consequences of corresponding results via rectangular ...-...-admissible mappings. This idea can also be applied to obtain coupled and tripled fixed point theorems in other spaces under various contractive conditions which reduces the proof considerably.