probably also in our text somewhere; easier to find here if the net happens to be in a good mood

February 6, 2015 in Combinatorics

combinations with repetition (from a course by one “miguel a.~lerma” at northwestern).

4 Comments

  1. dave

    February 9, 2015 at 12:40 pm

    Good day Owen,
    I lived on campus from 07 to 11 and have two Zines. 0.8 and #1.
    Is there a way to get a complete set?
    Dave in Cleveland.

    Reply
  2. vlorbik

    February 14, 2015 at 4:36 pm

    hi dave. my email is vlorbik_@_gmail.com (sans _underlines_); send along a postal address & i’ll see what i’ve got on file. at least a few of the “micro” format like 0.8 are available as of right now i know. thanks for your interest!

    Reply
  3. vlorbik

    April 14, 2015 at 6:42 pm

    http://en.wikipedia.org/wiki/Twelvefold_way

    Enumeration formulas for the twelvefold way
    Any f Injective f Surjective f
    Distinct x^n\, x^{\underline n} \textstyle x!\{{n\atop x}\}\,
    Sn orbits \binom{x+n-1}n \binom xn \binom{n-1}{n-x}
    Sx orbits \sum_{k=0}^x\left\{{n\atop k}\right\} [n\leq x] \left\{{n\atop x}\right\}
    Sn×Sx orbits p_x(n+x)\, [n\leq x] p_x(n)\,

    Reply

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