There is no difference betwee time and space dimensions, it s just a shortcut of language we use to describe t in our universe.

Greg egans calls z u. It doesn t matter if you say z/u is a space or time dimension, what matters are the implcation for the space time geometry.

So yes, Dicrhonauts describes your universe.

So our universe is 3+ and 1-. Orthogonal describe 4+ and dichronauts describes 2+ and 2-. I guess all the possibilites have been explored!

How about 5 dimensional universes Mr Egan ?

There is no difference betwee time and space dimensions, it s just a shortcut of language we use to describe t in our universe.

Greg egans calls z u. It doesn t matter if you say z/u is a space or time dimension, what matters are the implcation for the space time geometry.

So yes, Dichronauts describes your universe.

So our universe is (+,+,+,-). Greg Egan's Orthogonal describes (+,+,+,+) and Dichronauts describes (+,+,-,-). I guess all the possibilites have been explored!

How about 5 dimensional universes Mr Egan ?