Word Count : 368

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For a system of three identical fermions in a one-dimensional box of size \( A \), the total wave function must be antisymmetric under the exchange of any two particles. This means the spatial wave function must be antisymmetrized, and if the particles have spin, the total wave function (spatial + spin) must obey the Pauli exclusion principle. ### Step 1: ____ ____ ______ ______ _____ _________ _____.
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