The projector head is far more stable than traditional projective systems.
2.
The group algebras form a projective system with limit " X ".
3.
The definition extends to more general projective systems, such as those indexed by the positive integers ordered by divisibility.
4.
General theory of solenoids and expanding attractors, not necessarily one-dimensional, was developed by R . F . Williams and involves a projective system of infinitely many copies of a compact branched manifold in place of the circle, together with an expanding self-immersion.
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