See
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p_1\odot p_2\coloneqq\sum_{i_1,i_2)\in p_1(1)\times p_2(1)}\yon^{p_1[i_1]\cdot p_2[i_2]} |
(bottom of page 71 of the current pdf)
There's a missing opening paren before i_1 and a notational inconsistency between the prose and the displayed equation (it should be \star lifted to \odot following 3.81).
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p_1\otimes p_2\coloneqq\sum_{i_1,i_2)\in p_1(1)\times p_2(1)}\yon^{p_1[i_1]\times p_2[i_2]} |
also has a missing paren.
