The plactic monoid is an algebraic structure that arises in the study of combinatorial representation theory and the theory of Crepant resolutions in algebraic geometry. It is particularly important in the representation theory of the symmetric group and related areas. ### Definition The plactic monoid is defined as follows: 1. **Generators**: The plactic monoid is generated by the symbols \( e_i \) for \( i \geq 1 \).
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