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Delete _check_rank_two method for Drinfeld modules #38199

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merged 4 commits into from
Jul 24, 2024
Merged

Delete _check_rank_two method for Drinfeld modules #38199

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5f966bb
Delete _check_rank_two method
kryzar Jun 11, 2024
06cb979
Re-add and deprecate _check_rank_two
kryzar Jun 13, 2024
a2c0798
Remove useless backslash
kryzar Jun 13, 2024
7de3be5
Delete _check_rank_two method (again!)
kryzar Jun 25, 2024
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21 changes: 0 additions & 21 deletions src/sage/rings/function_field/drinfeld_modules/drinfeld_module.py
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Original file line number Diff line number Diff line change
Expand Up @@ -759,27 +759,6 @@ def _Hom_(self, other, category):
from sage.rings.function_field.drinfeld_modules.homset import DrinfeldModuleHomset
return DrinfeldModuleHomset(self, other, category)

def _check_rank_two(self):
r"""
Raise ``NotImplementedError`` if the rank is not two.

TESTS::

sage: Fq = GF(25)
sage: A.<T> = Fq[]
sage: K.<z12> = Fq.extension(6)
sage: p_root = 2*z12^11 + 2*z12^10 + z12^9 + 3*z12^8 + z12^7 + 2*z12^5 + 2*z12^4 + 3*z12^3 + z12^2 + 2*z12
sage: phi = DrinfeldModule(A, [p_root, z12^3, z12^5])
sage: phi._check_rank_two()
sage: phi = DrinfeldModule(A, [p_root, 1])
sage: phi._check_rank_two()
Traceback (most recent call last):
...
NotImplementedError: rank must be 2
"""
if self.rank() != 2:
raise NotImplementedError('rank must be 2')

def _latex_(self):
r"""
Return a LaTeX representation of the Drinfeld module.
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