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Matrix transposition.

src/s/y/sympy-0.7.5/sympy/matrices/tests/test_immutable.py   sympy(Download)
 
    X = ImmutableMatrix([[1, 2], [2, 1]])
    assert X.T == X
    assert X.is_symmetric
    assert type(X.cholesky()) == ImmutableMatrix

src/s/y/sympy-HEAD/sympy/matrices/tests/test_immutable.py   sympy(Download)
 
    X = ImmutableMatrix([[1, 2], [2, 1]])
    assert X.T == X
    assert X.is_symmetric
    assert type(X.cholesky()) == ImmutableMatrix