All physical symmetries correspond to automorphisms in axioms, but not all automorphisms in physical equations imply symmetries. Many physical phenomena are described by differential equations, where an automorphism can be viewed as an isomorphism of the solution set. This isomorphism typically represents a coordinate transformation that maps solutions into one another without altering the governing equation's form. Such transformations are classified as symmetries of the differential equation. Understanding this relationship is crucial for comprehending the underlying principles of physical laws.
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Garrulo
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All the physical simmetries implicate an automorphism in axioms. But ¿all the automorphisms from a physical equation do implicate a simmetry?
I am not sure I understand, but I think I may know what you have in mind. Many phenomena in physics are governed by differential equations, and we can consider an isomorphism of the solution set of a given equation into itself (an automorphism). Usually such an isomorphism expresses a coordinate transformation of some sort. This transformation maps solutions into each other, and the form of the governing differential equation does not change. We define such a map as a symmetry of the differential equation.
Do we even know? My understanding of dark energy is that particles come into existence, exert and outward force, then vanish. My problem with that is how, of course, then how does dark energy know to push everything in the same direction? The pressure exerted would be in all directions, even if the space was moving so why isn't stuff pushed all over the sky?
Thanks - rev
I think it's easist first to watch a short vidio clip
I find these videos very relaxing to watch .. I got to thinking is this being done in the most efficient way?
The sand has to be suspended in the water to move it to the outlet ... The faster the water , the more turbulance and the sand stays suspended, so it seems to me the rule of thumb is the hose be aimed towards the outlet at all times .. Many times the workers hit the sand directly which will greatly reduce the water...