def test_is_alt_sym():
G = DihedralGroup(10)
assert G.is_alt_sym() is False
assert G._eval_is_alt_sym_naive() is False
assert G._eval_is_alt_sym_naive(only_alt=True) is False
assert G._eval_is_alt_sym_naive(only_sym=True) is False
S = SymmetricGroup(10)
assert S._eval_is_alt_sym_naive() is True
assert S._eval_is_alt_sym_naive(only_alt=True) is False
assert S._eval_is_alt_sym_naive(only_sym=True) is True
N_eps = 10
_random_prec = {'N_eps': N_eps,
0: Permutation([[2], [1, 4], [0, 6, 7, 8, 9, 3, 5]]),
1: Permutation([[1, 8, 7, 6, 3, 5, 2, 9], [0, 4]]),
2: Permutation([[5, 8], [4, 7], [0, 1, 2, 3, 6, 9]]),
3: Permutation([[3], [0, 8, 2, 7, 4, 1, 6, 9, 5]]),
4: Permutation([[8], [4, 7, 9], [3, 6], [0, 5, 1, 2]]),
5: Permutation([[6], [0, 2, 4, 5, 1, 8, 3, 9, 7]]),
6: Permutation([[6, 9, 8], [4, 5], [1, 3, 7], [0, 2]]),
7: Permutation([[4], [0, 2, 9, 1, 3, 8, 6, 5, 7]]),
8: Permutation([[1, 5, 6, 3], [0, 2, 7, 8, 4, 9]]),
9: Permutation([[8], [6, 7], [2, 3, 4, 5], [0, 1, 9]])}
assert S.is_alt_sym(_random_prec=_random_prec) is True
A = AlternatingGroup(10)
assert A._eval_is_alt_sym_naive() is True
assert A._eval_is_alt_sym_naive(only_alt=True) is True
assert A._eval_is_alt_sym_naive(only_sym=True) is False
_random_prec = {'N_eps': N_eps,
0: Permutation([[1, 6, 4, 2, 7, 8, 5, 9, 3], [0]]),
1: Permutation([[1], [0, 5, 8, 4, 9, 2, 3, 6, 7]]),
2: Permutation([[1, 9, 8, 3, 2, 5], [0, 6, 7, 4]]),
3: Permutation([[6, 8, 9], [4, 5], [1, 3, 7, 2], [0]]),
4: Permutation([[8], [5], [4], [2, 6, 9, 3], [1], [0, 7]]),
5: Permutation([[3, 6], [0, 8, 1, 7, 5, 9, 4, 2]]),
6: Permutation([[5], [2, 9], [1, 8, 3], [0, 4, 7, 6]]),
7: Permutation([[1, 8, 4, 7, 2, 3], [0, 6, 9, 5]]),
8: Permutation([[5, 8, 7], [3], [1, 4, 2, 6], [0, 9]]),
9: Permutation([[4, 9, 6], [3, 8], [1, 2], [0, 5, 7]])}
assert A.is_alt_sym(_random_prec=_random_prec) is False
G = PermutationGroup(
Permutation(1, 3, size=8)(0, 2, 4, 6),
Permutation(5, 7, size=8)(0, 2, 4, 6))
assert G.is_alt_sym() is False
# Tests for monte-carlo c_n parameter setting, and which guarantees
# to give False.
G = DihedralGroup(10)
assert G._eval_is_alt_sym_monte_carlo() is False
G = DihedralGroup(20)
assert G._eval_is_alt_sym_monte_carlo() is False
# A dry-running test to check if it looks up for the updated cache.
G = DihedralGroup(6)
G.is_alt_sym()
assert G.is_alt_sym() == False
