sub sequences

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mahathir
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Joined:Tue Feb 15, 2011 11:01 pm
sub sequences

Unread post by mahathir » Tue Oct 11, 2011 1:18 pm

The elements of the set $H$ are finite sequences whose elements are from {$1,2,3$}. Suppose that no element of $H$ is a subsequence of any other element of $H$. Show that $H$ is finite
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