And here you are again dogmatically refusing to acknowledge that these words are not synonyms!
They are synonyms.
If you disagree with me, than please demonstrate a given system where its fixed aspect is not also its stable aspect.
Be aware of the fact that it has to be demonstrated within the borders of the given system.
Here is again a concrete example of how
stability AND instability are principles that found within the borders of any given scale of our universe:
The best way to understand it is to look at the whole universe as the machine itself.
From this mechanical comprehensive point of view, the fulcrum of a given lever that is located along the Equator of planet Earth, is more stable than the endpoints of a given pole along it, but it is less stable than the fulcrum at the center of the Earth.
The fulcrum at the center of the earth is more stable than the fulcrum of that given lever, but it is less stable than the fulcrum at the center of the Sun.
the fulcrum at the center of the Sun is more stable than the fulcrum at the center of the Earth, but it is less stable than the fulcrum at the center of the Milky-way galaxy.
The symmetry at the basis of our universe is more stable than any asymmetric phenomena like the acceleration of galaxies and clusters of galaxies all over the observed universe.
So within our universe, there are different scale levels, where within the border of each scale level there is both
stability AND instability, or in other word this pair exists independently of any given scale.