Talk:Quasi-metric

Definition

The citation Schroeder (2006) gives an different definition of quasi-metric [1]:

• $d(x,y) \ge 0$ and $=0$ iff $x=y$ (positive definite);
• $d(x,y) = d(y,x)$ (symmetric);
• there is a constant $K \ge 1$ such that $d(x,y) \le K \max\{d(x,z),d(z,x)\}$.

Richard Pinch (talk) 20:36, 6 March 2016 (CET)