Chris wrote:
I wonder what it means?

covariant? Tensor? Metric?


I never did know. I probably never will.

They are mathematical concepts which are not of fundamental importance
at all. They are but mere tools of confusion very active in the modern
understanding of physics and mathematics.

You aren't missing anything.

Will it get me to alpha centuri or make me immortal?

I don't think so.

I used to think how far the frontiers of mathematics has gone. Now I
realize it is the frontiers of confusion. Those concepts aren't
important now and they never were - always remember Orwell's lesson -
those who control the past determine the future. Those who control the
present determine the past.