Howe duality for the dual pair (SpO(2n1),osp(22))\left(\text{SpO}(2n|1)\,, \mathfrak{osp}(2|2)\right)

This paper establishes an explicit description of the highest weights and joint highest weight vectors for the irreducible representations of the dual pair SpO(2n1)\text{SpO}(2n|1) and osp(22)\mathfrak{osp}(2|2) within the supersymmetric algebra S(C2n1C11)\text{S}(\mathbb{C}^{2n|1} \otimes \mathbb{C}^{1|1}), thereby providing a concrete realization of their Howe duality correspondence.

Roman Lavicka, Allan Merino2026-03-06🔢 math

Differential symmetry breaking operators from a line bundle to a vector bundle over real projective spaces

This paper classifies and constructs differential symmetry breaking operators from a line bundle over RPn\mathbb{R}\mathbb{P}^n to a vector bundle over RPn1\mathbb{R}\mathbb{P}^{n-1}, while determining their factorization identities, the associated branching laws for generalized Verma modules of sl(n+1,C)\mathfrak{sl}(n+1,\mathbb{C}), and the resulting SL(n,R)SL(n,\mathbb{R})-representations.

Toshihisa Kubo2026-03-06🔢 math

Super-decomposable pure-injective modules over some Jacobian algebras

This paper establishes the existence of superdecomposable pure-injective modules over Jacobian algebras associated with triangulations of closed surfaces (excluding spheres with four or fewer punctures) by demonstrating the presence of independent pairs of dense chains of pointed modules in non-domestic skew-gentle and (skew) Brauer graph algebras, thereby confirming M. Prest's conjecture for these specific cases.

Shantanu Sardar2026-03-05🔢 math

Representations of the modular shifted super Yangian Y11(σ)Y_{1|1}(σ)

This paper classifies the finite-dimensional irreducible representations of the restricted super Yangian Y11[p]Y_{1|1}^{[p]} and the restricted truncated shifted super Yangian Y11,[p](σ)Y_{1|1,\ell}^{[p]}(\sigma) associated with the general linear Lie superalgebra gl11\mathfrak{gl}_{1|1} over an algebraically closed field of characteristic p>2p>2.

Hao Chang, Ruiying Hou, Hui Wu2026-03-05🔢 math

Measures on Cameron's treelike classes and applications to tensor categories

This paper completes the classification of measures on Cameron's elementary treelike Fraïssé classes by establishing a bijection for nn-colored rooted binary trees that yields infinite families of novel semisimple tensor categories with superexponential growth, while simultaneously proving the nonexistence of such measures on nn-colored and labeled tree classes for n2n \geq 2.

Thanh Can, Thomas Rüd2026-03-05🔢 math

Degenerations of CoHAs of 2-Calabi-Yau categories

This paper establishes that the degenerations of cohomological Hall algebras associated with 2-Calabi-Yau categories and preprojective algebras, with respect to the "less perverse" filtration, are isomorphic to the enveloping algebra of the current Lie algebra of the BPS Lie algebra, a result proven at the sheafified level and extended to torus-deformed settings to connect these structures with Maulik-Okounkov Yangians.

Lucien Hennecart, Shivang Jindal2026-03-05🔢 math

Counting Fq\mathbb F_q-points of orbital varieties in ad-nilpotent ideals of type AnA_n

This paper establishes two explicit formulas for counting Fq\mathbb F_q-points of orbital varieties in ad-nilpotent ideals of type AnA_n using Hall-Littlewood functions and qq-weighted tableaux, while providing new proofs and applications for results concerning nilpotent Hessenberg varieties, square-zero matrices, and double coset counts.

Mohammad Bardestani, Keivan Mallahi-Karai, Samrith Ram + 1 more2026-03-05🔢 math