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implement product of posets #12831

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fchapoton opened this issue Apr 11, 2012 · 6 comments
Closed

implement product of posets #12831

fchapoton opened this issue Apr 11, 2012 · 6 comments
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@sagetrac-sage-combinat
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c: combinatorics p: major / 3 t: enhancement
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sage-5.1

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@fchapoton
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There currently lacks an implementation of the (cartesian) product of posets.

sage: P2=Posets.ChainPoset(2)

sage: P4=Posets.ChainPoset(4)

sage: Q=P2.product(P4)

This should return a poset with 8 elements, with Hasse diagram a 2 x 4 grid.

It would be nice to have a fast enough procedure for this.

Depends on #12770

CC: @fchapoton @sagetrac-sage-combinat

Component: combinatorics

Keywords: poset, product

Author: Frédéric Chapoton

Reviewer: Itai Bar-Natan

Merged: sage-5.1.beta1

Issue created by migration from https://trac.sagemath.org/ticket/12831
@fchapoton fchapoton added this to the sage-5.1 milestone Apr 11, 2012
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Dependencies: #12770

@fchapoton
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comment:3

Some typos need to be corrected..

@fchapoton fchapoton modified the milestones: sage-5.1, sage-5.0 Apr 12, 2012
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Attachment: trac_12831-product_of_posets-fc.patch.gz

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Author: Frédéric Chapoton

@fchapoton fchapoton modified the milestones: sage-5.0, sage-5.1 Apr 20, 2012
@jdemeyer
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jdemeyer commented May 7, 2012

Reviewer: Itai Bar-Natan

@jdemeyer
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Merged: sage-5.1.beta1

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