((John has been unable to explain time travel, I will explain it here.))

I could be wrong but I don’t recall being asked to “explain time travel”. If you could point that out to me in the posts I would appreciate it.

So it’s ritualized combat on the battlefield of differential geometry. It’s a shame we couldn’t have more constructive dialogue on the subject. Of course, I’ve left my physics book in the time machine so unless you snuck in a hidden land-mine, I found your opening move very straightforward. However, you’re too confident I won’t be able to offer an explanation that I’m sure other physics fans will appreciate. I wonder if Einstein and Grossmann did it this way or maybe they just listened to each other and tried to build on what they thought would work. Oh well.

((..and debunk my calculations on time travel. You can’t, because you are a fraud!))

When I look up debunk, I see: “To expose or ridicule the falseness, sham or exaggerated claims.” The reason I cannot debunk your calculations is because they are true. They are not false, based on speculative facts or exaggerated. They are just incomplete. What you really want me to do is finish your explanation or I will be an imposter.

((There are, however, certain quantities that do remain constant. These constants are related to four-dimensional quantities known as metric tensors.))

Actually, I don’t think that’s correct. Minkowski spacetime (4-D) will not allow you to use Pythagoas’ theorem to decribe tensors because time needs to be expressed with the opposite sign. (please excuse my change of varibale case).

ds^2 = -c^2dt^2 + dx^2 + dy^2 + dz^2
(where ds describes timelike and spacelike trips).

The tensor we should be discussing is:
ds^2 = -a^2dt^2 + w^2(df – wdt)^2 + (r^2/ D)dr^2 + r^2dq^2

I hope I got the symbols right but you should be able to recognize this…right? nuts… the a, f, r, Delta and q didn’t make the translation in this font.

((The US government, including the UN, has its hands in everything from biological tests to secret planes that can fly out of Earths atmosphere.))

Care to share with me how you solved the overheating problem on your spaceplane?

Javier, don’t worry. I’ll talk to you too. Please check again and you’ll find my hello.

I will get to and review the questions I missed. I apologize if my answers seemed flippant. There are many posts I want to respond to and I am unable to pay as much attention as I would like.