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Imanishi, Jinzenji and Kuwata provided a recipe for computing Euler number of
Grassmann manifold \$G(k,N)\$ using physical model and its path-integral
[S.Imanishi, M.Jinzenji and K.Kuwata, Journal of Geometry and Physics, Volume
180, October 2022, 104623]. They demonstrated that the cohomology ring of
\$G(k,N)\$ is represented by fermionic variables. In this study, using only
fermionic variables, we computed an integral of the Chern classes of the dual
bundle of the tautological bundle on \$G(k,N)\$. In other words, the intersection
number of the Schubert cycles is obtained using the fermion integral.

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