a third genetic operator (a curious difference)

[Mitchell Timin]

There is one major difference between operator 3 and the others, and
that becomes evident when the population becomes homogeneous. If all
chromosomes are identical, then 1 and 2 have no effect whatsoever! This
actually happens in practice; after many generations of evolution all
diversity is lost except the small changes due to mutation. However,
operator 3 will create major changes to chromosomes even in this case.
This means that diversity of a population cannot be totally lost, if 3
is active.

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