Source: cirosantilli/minkowski-space
= Minkowski space
{c}
{tag=Pseudometric space}
{wiki}
<\R^4> with a weird <dot product>-like operation called the <Minkowski inner product>.
Because the <Minkowski inner product> product is not <positive definite>, the <norm induced by an inner product> is a <norm>, and the space is not a <metric space> strictly speaking.
The name given to this type of space is a <pseudometric space>.