[extropy-chat] unidirectional thrust

[scerir]

Mike: 
> If Mach's Principle is true, and inertia is the whole universe
> resisting your acceleration (when gravity is light speed dependent,
> thus must have a time travel component to resist your push when you
> push), there has to be a way to use it to lever one's spaceship against
> the entire universe in return.

"Acceleration can only be defined
as relative acceleration of a point
relative to other bodies. This circumstance
indicates that it is meaningless to ascribe
to a body a resistance relative to acceleration
as such (inertial resistance of bodies 
in the sense of classical mechanics); much rather,
it must be required that the appearence of
an inertial resistance be tied to the relative
acceleration of the considered body relative to
other bodies. It must be required that the inertial
resistance of a body can be increased by bringing
unaccelerated ponderable masses into the
neighborhood of the body."
- A.Einstein (1913)