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Topic: 2 fold derangements
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Patrick D. Rockwell

Posts: 57
Registered: 12/12/04
2 fold derangements
Posted: Jul 2, 2013 12:46 AM
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Could someone please help me with the subject covered on the following url?

It's about something called two fold derangements.

I think that a two fold derangements is a derangement of two other arrangements such as the following.


41253 <-----------

Notice that the third line has numbers. that are different from the ones above, but I wonder if the author of the above URL has
another idea because he comes up with different numbers than I do.

Also, what does the following signify?


For example, does [2][3] signify an arrangement where 2 elements are the same,
and the other 3 are different from them but identical to each other?

Thanks in advance for any help.

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