Created
December 1, 2017 10:26
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| from sympy.tensor.tensor import TensorIndexType, tensor_indices, tensorhead, TensorManager | |
| Lorentz = TensorIndexType('Lorentz') | |
| i0, i1, i2, i3, i4 = tensor_indices('i0:5', Lorentz) | |
| A = tensorhead('A', [Lorentz], [[1]]) | |
| G = tensorhead('G', [Lorentz], [[1]], 'Gcomm') | |
| GH = tensorhead('GH', [Lorentz], [[1]], 'GHcomm') | |
| TensorManager.set_comm('Gcomm', 'GHcomm', 0) | |
| (GH(i1) * G(i0)).canon_bp() |
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get_comm(i, j)
Return the commutation parameter for commutation group numbers i, j
see _TensorManager.set_comm
set_comm(i, j, c)
i, j can be symbols, strings or numbers, apart from 0, 1 and 2 which are reserved respectively for commuting, anticommuting tensors and tensors not commuting with any other group apart with the commuting tensors.