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Matroid._max_independent: Fix call of _rank #41150

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merged 1 commit into from
Nov 11, 2025
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Matroid._max_independent: Fix call of _rank #41150

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9 changes: 8 additions & 1 deletion src/sage/matroids/matroid.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -637,12 +637,19 @@ cdef class Matroid(SageObject):
True
sage: all(M.is_dependent(X.union([y])) for y in M.groundset() if y not in X)
True

TESTS::

sage: M = matroids.catalog.R10()
sage: M1M = M.direct_sum(M)
sage: Matroid(M1M, regular=True) # indirect doctest
Regular matroid of rank 10 on 20 elements with 26244 bases
"""
cdef list res = []
cdef int r = 0
for e in X:
res.append(e)
if self._rank(res) > r:
if self._rank(frozenset(res)) > r:
r += 1
else:
res.pop()
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