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feat: rank4 epsilon tensor added

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Fabian Joswig 2021-12-21 20:28:08 +01:00
parent 1cbbc68e8b
commit b50346dcf3
1 changed files with 12 additions and 0 deletions
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12
pyerrors/input/hadrons.py
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@ -298,6 +298,18 @@ def read_Fourquark_hd5(path, filestem, ens_id, idl=None, vertices=["VA", "AV"]):
return result_dict
def _epsilon_tensor(i, j, k, o):
"""Rank-4 epsilon tensor
Extension of https://codegolf.stackexchange.com/a/160375
"""
test_set = set((i, j, k, o))
if not (test_set <= set((1, 2, 3, 4)) or test_set <= set((0, 1, 2, 3))):
raise Exception("Unexpected input", i, j, k, o)
return (i - j) * (j - k) * (k - i) * (i - o) * (j - o) * (o - k) / 12
def _get_lorentz_names(name):
assert len(name) == 2