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# Exercise 87 - Chapter 1

edited June 2018

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.

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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].
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2.

I think this is no longer exercise 87, but 89

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