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gh-35100: New ABC sage.structure.element.NumberFieldElement, deprecat…
…e is_NumberFieldElement <!-- ^^^^^ Please provide a concise, informative and self-explanatory title. Don't put issue numbers in there, do this in the PR body below. For example, instead of "Fixes #1234" use "Introduce new method to calculate 1+1" --> ### 📚 Description Fixes #34931 <!-- Describe your changes here in detail --> <!-- Why is this change required? What problem does it solve? --> <!-- If it resolves an open issue, please link to the issue here. For example "Closes #1337" --> ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> <!-- If your change requires a documentation PR, please link it appropriately --> <!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! --> - [x] I have made sure that the title is self-explanatory and the description concisely explains the PR. - [x] I have linked an issue or discussion. - [ ] I have created tests covering the changes. - [ ] I have updated the documentation accordingly. ### ⌛ Dependencies <!-- List all open pull requests that this PR logically depends on --> <!-- - #xyz: short description why this is a dependency - #abc: ... --> Depends on #35033 URL: #35100 Reported by: Matthias Köppe Reviewer(s): Matthias Köppe, Travis Scrimshaw
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from sage.structure.element cimport FieldElement | ||
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cdef class NumberFieldElement_base(FieldElement): | ||
pass |
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r""" | ||
Number field elements (abstract base class) | ||
""" | ||
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# **************************************************************************** | ||
# Copyright (C) 2023 Matthias Koeppe | ||
# | ||
# Distributed under the terms of the GNU General Public License (GPL) | ||
# as published by the Free Software Foundation; either version 2 of | ||
# the License, or (at your option) any later version. | ||
# https://www.gnu.org/licenses/ | ||
# **************************************************************************** | ||
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cdef class NumberFieldElement_base(FieldElement): | ||
r""" | ||
Abstract base class for :class:`~sage.rings.number_field.number_field_element.NumberFieldElement` | ||
This class is defined for the purpose of :func:`isinstance` tests. It should not be | ||
instantiated. | ||
EXAMPLES:: | ||
sage: k.<a> = NumberField(x^3 + x + 1) | ||
sage: isinstance(a, sage.rings.number_field.number_field_element_base.NumberFieldElement_base) | ||
True | ||
By design, there is a unique direct subclass:: | ||
sage: len(sage.rings.number_field.number_field_element_base.NumberFieldElement_base.__subclasses__()) <= 1 | ||
True | ||
""" | ||
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pass |
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