Cone metric spaces and fixed point theory

Question

These days cone metric spaces, as a generalization of metric spaces, started to be very interesting... A special interest for this space is its application to the fixed point theory. On the last papers there is proven that cone metric space is metrazible, and so a lot of theorems in cone metric spaces are merely copies from metric spaces. But still there are theorems which are not a direct consequence form metric spaces. My question is: How do we know which theorems have to be redundant (direct consequence form metric spaces) and which not?

Answer 1

https://www.google.com/search?q=Cone+metric+spaces+and+fixed+point+theorems+of+contractive+mappings&ie=UTF-8&sa=Search&channel=fe&client=browser-ubuntu&hl=en ........................................................