Actually zc, if you really are the person who called himself "theorist" at the Hawking forum then you've done this before. You've attmpted to correct me before even asking me tpo explain. In those situations you tried to correct something which you didn't understand. ie you never knew that the terms "scalar" and "invariant" were synonymous too.

Are you that person?

If not then where is this other forum you claimed to have posted at and under what name did you post?

I'm a physicist and I rely only on facts. And I see how little you think of facts from your posts on the tidal force tensor.