Prove the railway metric is a metric: trouble proving d(x, y) = d(y, x)
11094
How to prove that the French railways metric is a metric
27517
Isometry in compact metric spaces
104413
Is the exponential of $-d$ a positive definite kernel for a general metric space $(X, d)$?
59644
Proof of Cartesian product intersection
107321
How to show convexity of a ball in metric space?
148837
Equivalent definition of metric compatibility for a connection: what does $\nabla g$ mean?
17067
To prove that $(\mathbb{P(N)},d)$ is a metric space
39455
Prove that $(X\times Y)\setminus (A\times B)$ is connected
51227
Proving that given metric space is complete: $X := (0,\infty)$ and $d:=|\ln(x)-\ln(y)|$
146485
Prove that the product space is a metric space.
85242
Deciding whether two metrics are topologically equivalent in the space $C^1([0,1])$
41675
Metric is continuous, on the right track?
124179
Proof that every metric space is normal
74607
Variation of the metric with respect to the metric
83159
Defining a metric space
135315
Proving whether a function on the set of real sequences is a metric
36566
Equivalence classes and metric spaces