We've got the choices they could make: that's their strategy sets.

我们有他们可能选择的策略,就是策略集合

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So here Player I's strategy set, she has two choices top or bottom, represented by the rows, which are hopefully the top row and the bottom row.

这是参与人I的策略集合,她有上下两种选择,用横排来表示,即上下两排

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On the other hand, we've seen n that if the size of a is n, that's to say, we have n elements to choose from, then the number of possible subsets is 2 to the n.

另一方面，我们看到,如果a集合的大小是，也就是说我们有n个元素可供选择，而可能的子集的元素,个数就是2的n次方。

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