Otherwise the distance is infinite.
A metric is supposed to be always finite. Note the round right bracket in https://en.wikipedia.org/wiki/Metric_(mathematics)#Definition.
Fixed link.
This is probably not the intended link.
A metric is supposed to be always finite. Note the round right bracket in https://en.wikipedia.org/wiki/Metric_(mathematics)#Definition.
Fixed link.
This is probably not the intended link.