Symmetries of Molecular Integrals - Azure Quantum | Microsoft Learn

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    // Create a `OrbitalIntegral` instance to store a two-electron molecular
    // orbital integral data.
    var twoElectronIntegral = new OrbitalIntegral(new[] { 0, 1, 2, 3 }, 0.123);

    // This enumerates all spin-orbital indices of the `FermionTerm`s in the 
    // Hamiltonian represented by this integral -- this is an array of array 
    // of `SpinOrbital` instances.
    var twoElectronSpinOrbitalIndices = twoElectronIntegral.EnumerateSpinOrbitals();
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https://learn.microsoft.com/en-us/azure/quantum/user-guide/libraries/chemistry/concepts/symmetries-molecular