Let us imagine a person reading

http://www.sagemath.org/doc/reference/combinat/sage/combinat/posets/posets.html

It starts saying "implements finite partially ordered sets", so there is no support for infinite posets.

This page tells a reader about has_bottom() and has_top(), and there is also is_bounded() already. But for is_join_semilattice() ja is_meet_semilattice() there is no is_lattice().

Well, there is. It is here:
http://www.sagemath.org/doc/reference/categories/sage/categories/finite_posets.html

So, why is part of code in categories/*.py?

Then, how about is_distributive_lattice()? There it is: http://www.sagemath.org/doc/reference/combinat/sage/combinat/posets/hasse_diagram.html
But how to call it?

And last, why is there antichains() documented in two places, /combinat/posets/posets and /categories/finite_posets?

Confused am I.

--
Jori Mäntysalo

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