Be careful on partial metric fixed point results (Q1939201)

Let \((X,p)\) be a partial metric space. Then the functional \(d: X \times X \to \mathbb R_+\) defined by \(d(x,y) = 0\) whenever \(x = y\) and \(d(x,y) = p(x,y) \) whenever \(x \neq y\), is a metric on \(X\). In this paper the authors show that some fixed point generalization to \((X,p)\) can be obtained from the corresponding results in \((X,d)\).