Ideals, free stars, and mixers in my book

I wrote a section on ideals, free stars, and mixers in my book.

Now free stars (among with ideals and mixers) are studied as first class objects, being shown isomorphic to filters on posets.

In (not so far) future it should allow to extend our research of pointfree funcoids and staroids/multifuncoids, using now comprehensive theory of free stars (as now we know that they are isomorphic to filters and so their properties are quite clear).

See the development version of my book.

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