Macaulay2/M2

View on GitHub

The primary source code repository for Macaulay2, a system for computing in commutative algebra, algebraic geometry and related fields.

Stars: 435
Forks: 297
Open beginner issues: 24
Indexed issues: 774
Avg merge: 4d 20h
Merged PRs (30d): 11

Dominant language: Macaulay2
License: No license data
Last GitHub push: Jun 14, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

774 open issues indexed

Eigen 5.0: some svd routines deprecated Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

Macaulay2/M2#4723 · Opened Sep 17, 2026
Default-constructed FLINT DMat specializations are uninitialized and corrupt the heap on destruction Open

Engine Linear Algebra

Difficulty 3/5 1-2 days Newbie friendliness 78/100

Macaulay2/M2#4720 · Opened Sep 16, 2026
MonomialOrderings::join skips blocks after weights in an existing order Open

Engine

Difficulty 3/5 1-2 days Newbie friendliness 78/100

Macaulay2/M2#4717 · Opened Sep 16, 2026
MinimalPrimes::min_primes exceeds count limit across codimensions Open

Engine

Difficulty 3/5 1-2 days Newbie friendliness 72/100

Macaulay2/M2#4716 · Opened Sep 16, 2026
64-bit ExponentVector weights and formatting truncate exponents to 32 bits Open

Engine

Difficulty 3/5 1-2 days Newbie friendliness 78/100

Macaulay2/M2#4715 · Opened Sep 16, 2026
MonomialOrderings::product drops weight blocks during offsetting Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

Macaulay2/M2#4714 · Opened Sep 16, 2026
ModuleMonomLessThan is not a strict comparator for std::sort Open

Engine

Difficulty 1/5 Under an hour Newbie friendliness 88/100

Macaulay2/M2#4713 · Opened Sep 16, 2026
MonomialMemorySpace release-all methods leave the allocation count stale Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

Macaulay2/M2#4712 · Opened Sep 16, 2026
Nonlegacy ExponentList constructors use legacy length words Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

Macaulay2/M2#4711 · Opened Sep 16, 2026
varpower::power(a, 0, output) appends the identity to an existing output Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

Macaulay2/M2#4710 · Opened Sep 16, 2026
varpower::monsyz writes both factors into sa and leaves sb invalid Open

Engine

Difficulty 3/5 1-2 days Newbie friendliness 84/100

Macaulay2/M2#4709 · Opened Sep 16, 2026
SMat column scaling and division skip the entry after a removed zero Open

Engine

Difficulty 3/5 1-2 days Newbie friendliness 76/100

Macaulay2/M2#4708 · Opened Sep 16, 2026
SMat subtraction skips the last coefficient and crashes on empty columns Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

Macaulay2/M2#4707 · Opened Sep 16, 2026
SMat equality ignores sparse row positions and unequal list lengths Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

Macaulay2/M2#4706 · Opened Sep 16, 2026
Intended behavior of bracket powers Open

Core

Difficulty 5/5 Over a week Newbie friendliness 32/100

Macaulay2/M2#4703 · Opened Sep 16, 2026
Lattice enumeration excludes the root from n_nodes when initial bounds are infeasible Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

Macaulay2/M2#4702 · Opened Sep 15, 2026
SuffixTree misses overlaps on small pattern sets and leaves expected suffix links unset Open

Engine

Difficulty 4/5 3-5 days Newbie friendliness 55/100

Macaulay2/M2#4701 · Opened Sep 15, 2026
NaiveDedupGeobucket retains opposite leading terms in its returned polynomial Open

Engine

Difficulty 4/5 3-5 days Newbie friendliness 66/100

Macaulay2/M2#4700 · Opened Sep 15, 2026
Allow zero operands in ARingZZp subtract_multiple Open

Engine

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Macaulay2/M2#4699 · Opened Sep 15, 2026
ARingZZp constructor silently narrows a modulus above INT_MAX Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

Macaulay2/M2#4698 · Opened Sep 15, 2026
ARingRR and ARingRRR compare NaN equal to finite values Open

Engine

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Macaulay2/M2#4697 · Opened Sep 15, 2026
ARingQQFlint from_ring_elem_const disagrees with from_ring_elem Open

Engine

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Macaulay2/M2#4696 · Opened Sep 15, 2026
ARingZZGMP reports the FLINT ring name Open

Engine

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

Macaulay2/M2#4695 · Opened Sep 15, 2026
skip building emacs package is no emacs is available Open

build issue editors

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

Macaulay2/M2#4691 · 1 comment · Opened Sep 14, 2026
Catch TBB errors in the engine Open

Engine

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Macaulay2/M2#4686 · Opened Sep 10, 2026
GLex after a Lex block produces incorrect weights Open

Core Documentation

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Macaulay2/M2#4672 · 2 comments · Opened Aug 31, 2026
Return value of AfterNoPrint is printed to the console - this seems wrong Open

Core Interpreter under discussion

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Macaulay2/M2#4669 · Opened Aug 26, 2026
conjugate has no Matrix or MutableMatrix method and there is no conjugate transpose, though EngineTests defines one locally and DeterminantalRepresentations assumes one exists Open

bugs directory Core

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Macaulay2/M2#4652 · Opened Aug 14, 2026
The monomials documentation promises a one-row matrix with each monomial once; neither is true for a matrix with more than one row Open

bugs directory Core Documentation

Difficulty 3/5 Half a day Newbie friendliness 62/100

Macaulay2/M2#4651 · Opened Aug 14, 2026
No way to wait for the first of a set of tasks to finish; wait is undefined on Task and isReady must be polled Open

bugs directory Interpreter threads

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Macaulay2/M2#4650 · Opened Aug 14, 2026
Growing a MutableList past its length is not thread-safe, and silently discards about a quarter of concurrent writes Open

bugs directory Interpreter threads

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Macaulay2/M2#4649 · Opened Aug 14, 2026
The GroupRevLex documentation says the feature is not implemented yet, but it works Open

bugs directory Documentation

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Macaulay2/M2#4648 · Opened Aug 14, 2026
Many operator documentation nodes are still in the pre-Headline style, several with no Headline at all, while their siblings in the same file are modern Open

bugs directory Documentation

Difficulty 4/5 3-5 days Newbie friendliness 65/100

Macaulay2/M2#4647 · Opened Aug 14, 2026
Ideal ? Ideal is not defined, so a list of ideals cannot be sorted Open

bugs directory Core

Difficulty 3/5 1-2 days Newbie friendliness 70/100

Macaulay2/M2#4646 · 2 comments · Opened Aug 14, 2026
The hilbertPolynomial(Module) documentation has a section commented out for a bug that has since been fixed Open

bugs directory Documentation

Difficulty 1/5 Under an hour Newbie friendliness 82/100

Macaulay2/M2#4645 · Opened Aug 14, 2026
prune and minimalPresentation silently drop a Lex order, returning a ring ordered by GRevLex instead Open

bugs directory Core

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Macaulay2/M2#4644 · Opened Aug 13, 2026
quotient has a Linear strategy that is an unimplemented stub and is commented out of the hook table, so requesting it is an error Open

bugs directory Core

Difficulty 5/5 Over a week Newbie friendliness 35/100

Macaulay2/M2#4642 · Opened Aug 13, 2026
radical still uses the translated classic Macaulay algorithms; neither Krick/Logar for characteristic zero nor Kemper for characteristic p is implemented Open

bugs directory Core

Difficulty 5/5 Over a week Newbie friendliness 30/100

Macaulay2/M2#4641 · Opened Aug 13, 2026
The minimalPrimes documentation says decomposition does not happen over the extension field, then never shows what does Open

bugs directory Documentation

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

Macaulay2/M2#4640 · Opened Aug 13, 2026
rawLinAlgDeterminant over the FLINT integer ring segfaults and corrupts the heap whenever an entry is zero; ZZFlint should be fixed or removed Open

bugs directory Engine

Difficulty 5/5 Over a week Newbie friendliness 35/100

Macaulay2/M2#4639 · Opened Aug 13, 2026
reesIdeal(I, a) saturates in a tower ring, where most saturate strategies decline, so it cannot finish where flattening first takes ten seconds Open

bugs directory Core

Difficulty 5/5 Over a week Newbie friendliness 42/100

Macaulay2/M2#4638 · Opened Aug 13, 2026
topCoefficients segfaults on a matrix with two or more rows when some component does not involve the top variable Open

bugs directory Engine

Difficulty 3/5 1-2 days Newbie friendliness 75/100

Macaulay2/M2#4637 · Opened Aug 13, 2026
SortStrategy is documented as unimplemented but is live and unvalidated: two of its values segfault and one silently returns a non-minimal resolution Open

bugs directory Engine

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Macaulay2/M2#4636 · 1 comment · Opened Aug 13, 2026
coimage and isInjective take no options, so kernel's DegreeLimit, SubringLimit and Strategy cannot be reached through them Open

bugs directory Core

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Macaulay2/M2#4633 · Opened Aug 12, 2026
An interrupt during a negative power is reported as "element not invertible", because Ring::power uses is_zero as its failure sentinel Open

bugs directory Engine

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Macaulay2/M2#4632 · Opened Aug 12, 2026
integralClosure of an ideal can be intractable where the same closure via integralClosure(I, d) is instant Open

bugs directory

Difficulty 5/5 Over a week Newbie friendliness 35/100

Macaulay2/M2#4631 · Opened Aug 12, 2026
Fractions are not put in lowest terms when the base ring has relations, carrying an arbitrarily large common integer factor Open

bugs directory Engine

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Macaulay2/M2#4630 · Opened Aug 12, 2026
Schubert2: a polynomial dot product in the engine, and logg and expp in the engine Open

bugs directory Engine

Difficulty 5/5 Over a week Newbie friendliness 35/100

Macaulay2/M2#4629 · Opened Aug 12, 2026
pushFwd cannot express one Galois field as a module over a smaller one, though the same extension spelled as quotient rings works Open

bugs directory Core

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Macaulay2/M2#4628 · Opened Aug 12, 2026
monomialIdeal gains a spurious generator over a quotient coefficient ring, producing an ideal that contains a unit but not 1 Open

bugs directory Engine

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Macaulay2/M2#4626 · Opened Aug 11, 2026

Macaulay2/M2

Get new issues in your inbox