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Add AI_POLICY.md

Status: Open.

#3289 In stan-dev/math;

· SteveBronder opened on Feb 26, 2026

Add low-rank multivariate normal distribution

Status: Open.

#3288 In stan-dev/math;

· lingium opened on Feb 24, 2026

Reuse direct reverse mode autodiff specializations for known laplace distributions

Status: Open.

#3287 In stan-dev/math;

· SteveBronder opened on Feb 23, 2026

Matrix comprehensions (build_matrix function)

feature

new function

Status: Open.

#3282 In stan-dev/math;

· WardBrian opened on Feb 12, 2026

laplace_marginal_tol with integrate_1d inside likelihood doesn't compile

Status: Open.

#3280 In stan-dev/math;

· avehtari opened on Feb 12, 2026

Add orthogonal and semi-orthogonal matrix types

Status: Open.

#3279 In stan-dev/math;

· spinkney opened on Feb 11, 2026

TBB worker threads scheduled to efficiency cores on Apple Silicon

Status: Open.

#3277 In stan-dev/math;

· ssp3nc3r opened on Feb 7, 2026

dims(x) on array[ , ] vector[ ] x outputs a size 4 array instead of size 3

Status: Open.

#3273 In stan-dev/math;

· spinkney opened on Jan 30, 2026

gp_periodic_cov() unexpected output for fixed period

Status: Open.

#3259 In stan-dev/math;

· mhollanders opened on Dec 12, 2025

Fix gamma_lccdf actually

Status: Open.

#3257 In stan-dev/math;

· spinkney opened on Dec 9, 2025

Higher-order mixture distribution

new function

Status: Open.

#3254 In stan-dev/math;

· WardBrian opened on Nov 14, 2025

Add where/select functions

new function

Status: Open.

#3253 In stan-dev/math;

· WardBrian opened on Nov 14, 2025