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sympy.eye

Python. Called in 2 tutorials; each line below leads to its place in the tutorial.

ToolPythonAdvanced

Clebsch-Gordan coefficients with sympy.physics.wigner: the sodium D lines

print("U U^T == 1:", U * U.T == sp.eye(6))

ToolPythonIntermediate

Hückel theory with SymPy: exact orbital energies of butadiene and benzene

M = alpha * sp.eye(n)