cianfa72's latest activity

Let's stop right here. We will not get far by insisting that "we all must agree that 2 + 2 = 5". A given flash bulb (for example) has...

It's not symerical, because the light source is at rest in one frame, but not the other. Motion relative to some random light source...

Yes sorry, only later I realized the point was about isotropy of light intensity and not light propagation process (speed).

Consider a dipole antenna that emits a brief pulse. The emitted radiation is not isotropic in any frame. But the shape of the wavefront...

Why assume the isotropy of light in this frame (i.e. in the frame where the horizontal blue plane has equation t= const). The light cone...

On reflection (sorry) I'm not sure this is correct, and need to do a bit of maths. It is definitely true that if the source emits a...

As far as I can tell, the parallel transport on the round sphere, when considering it embedded in 3D ambient euclidean space, works as...

Ah ok. So suppose to start with the turret's gun pointing in one given direction. Then, along the path being taken from the tunk hull on...

As I said in post #28, constraining a standard gyroscope axis to stay tangential to the surface won't work here. An actual 2D gyroscope...

The connection defines how vector components at one point in a space are related to vector components at a nearby point. Consider a...

I've generally seen FW transport only defined along timelike curves, so that definition would simply not apply to Riemannian manifolds...

Every time he himself turns by an angle x relative to the ground beneath his feet, he also turns the arrow by -x relative to himself, so...

Yes, as @Orodruin said in #27, we can assume a sort of 2D gyroscope (i.e. free to rotate only around one axis).

As far as I understand this, using a gyroscope internal to the tank's hull and programming the turret to counter-rotate at the same...

I disagree. The definition of a geodesics as a curve that parallel transports its tangent vector makes no sense without parallel...