Ken S. Tucker wrote:
Recently I posted to spr, aka the black hole of knowledge,
((Igor must be from ontario))

Turns out Igor is in ontario, he's a student, no wonder he doesn't
understand GR yet, and has superficial ability in tensors.
++++++

Jay Yablon wrote,
You do not need to check the derivation to (2.5). I did not "find" this
identity. This identity can be found in John Archibald Wheeler's
Geometrodynamics, page 251, note 22. It is a central identity to any
consideration of electric magentic duality.

Igor, wrote,
I see even less relevance of possible electric-magnetic duality to the
question at hand.

Igor crack a book, Pauli, Theory of Relativity pg 34,
Eq.(54b), learn duality.

What does the invariant "J" mean in Eq.(46a) ????

That's what Mr. Yablon is researching.

Yes, as requested, I'll try to post to spr but Igor will censor me
once again, he hates people smarter than him.
Ken S. Tucker