Talk:Hasse diagram

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[edit] Permutations or Combinations...

This is not a topic for discussion, it is rather a question. The problem is with problems concerning Permutations and Combinations. Whenever a question is put up, i don't know which of them is to be used. Is there any way where i can figure out which application to use for a certain problem? Please suggest.

[edit] New diagrams of cubes

This diff introduces a redrawing of the three alternative Hasse diagrams of a powerset (or hypercube), that is, I think, a little prettier than the earlier version of the same set of figures. The first has a row of six beige nodes in the middle, together with two more beige nodes at the top and the bottom. The second has a row of six beige nodes diagonally down the middle of the drawing, together with two more beige nodes at the top left and the bottom right. Therefore, it looks like the row of six is supposed to correspond with the row of six and that the two isoltaed nodes are supposed to correspond with the two isolated nodes. But that doesn't work: it would cause some of the edges in the second drawing to go downwards instead of upwards.

There is a correspondence of beige nodes to beige nodes that does work, and leaves all edges upwards, but it's not the obvious one. For this reason, I find the new drawing confusing. But perhaps not confusing enough to just keep reverting, so I have undone my second reversion and left this comment instead. I hope it can be possible to find a drawing that has not just the aesthetic appeal of this new version, but also avoids the confusion of the sort I fell into here. —David Eppstein 03:50, 3 September 2007 (UTC)

[edit] Nice article

This article looks much better than average maths article —Preceding unsigned comment added by 81.110.32.149 (talk) 12:24, 25 February 2008 (UTC)