julianandJulian Piribauer
51a5612fe1
Introduces: - class for Picard--Fuchs operators and their ideals - class for periods (their complex linear combinations in the Frobenius bases) Implements: - method to obtain operator from period - method to get power series solution (at given indicials) to PF ideal --------- Co-authored-by: Julian Piribauer <julian.piribauer@gmail.com> Reviewed-on: #13
16 lines
571 B
Python
16 lines
571 B
Python
"""
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Utility functions for the Calabi-Yau period geometry project.
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"""
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def _multi_indices(no_variables, total_degree: int) -> list:
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# All no_variables-tuples of non-negative integers whose entries sum to at most total_degree.
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def helper(remaining_vars, remaining_degree):
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if remaining_vars == 0:
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yield ()
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return
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for first in range(remaining_degree + 1):
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for rest in helper(remaining_vars - 1, remaining_degree - first):
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yield (first,) + rest
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return list(helper(no_variables, total_degree))
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