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Exercise 87 - Chapter 1

edited June 2018 in Exercises

There are 15 different partitions of a set with four elements. Choose 6 different ones and for each one \( c : S \twoheadrightarrow P \), find \( g_! (c) \), where S, T, and \( g : S \rightarrow T \) are as indicated.

Figure

Comments

  • 1.

    [1234],[1][234],[134][2],[124][3],[123][4],[12][34] are mapped to

    [1234],[1234],[1234],[124][3],[123][4],[12][34].

    Comment Source:[1234],[1][234],[134][2],[124][3],[123][4],[12][34] are mapped to [1234],[1234],[1234],[124][3],[123][4],[12][34].
  • 2.

    I think this is no longer exercise 87, but 89

    Comment Source:I think this is no longer exercise 87, but 89
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