I mean, what they mean by "non-Riemannina" specifically is that it's a metric that can't be realized as the metric on a Riemannian manifold. But while that muc

I mean, what they mean by "non-Riemannina" specifically is that it's a metric that can't be realized as the metric on a Riemannian manifold. But while that much is clear, getting beyond that is not. Which is why I'm asking, are they saying it's not a length space...