2026
On semigroups of orientation-preserving partial permutations with restricted range
De Biao Li 
and Vítor H. Fernandes
Parallel real hypersurfaces in $\mathbb{S}^2\times\mathbb{S}^2$ and $\mathbb{H}^2\times\mathbb{H}^2$ with respect to the $k$-generalized Tanaka—Webster connection
Zejun Hu and Xiaoge Lu
Classification of abelian finite-dimensional $C^*$-algebras by orthogonality
Bojan Kuzma and Sushil Singla
The extendibility of the parametric $D(-1)$-triples
Mirela Jukić Bokun and Ivan Soldo
A note about the discrete Riesz potential on $\mathbb{Z}^n$
Pablo Rocha
Unconditional convergence of general Fourier series
Vakhtang Tsagareishvili, Giorgi Tutberidze and Giorgi Cagareishvili
Pseudo-Ricci—Bourguignon solitons in the complex hyperbolic two-plane Grassmannians
Young Jin Suh and Changhwa Woo
Twisted duality and BV-algebras on the (co)homology of quadratic Poisson structures
Yaxuan Li and Shengqiang Wang
Homological properties of a family of quotients of the Rees algebra
Elahe Nafarieh Talkhooncheh , Maryam Salimi , Hamid Rasouli , Elham Tavasoli and Abolfazl Tehranian
On a conjecture by Pethő concerning absolute values of roots of generalized Fibonacci polynomials
Florian Luca and Diego Marques
Heisenberg double of some quantum group and its representations
Wei Wang , Limeng Xia and Senrong Xu
On the generalized Ramanujan—Nagell equation $D_1x^2-D_2=p^n$
Yasutsugu Fujita and Maohua Le
Finite groups with regular subgroup graph
Andrea Lucchini
In memory of László Kozma (1960-2026)
Csaba Vincze
An optimality condition for linear programs
Mihály Bessenyei and Norbert Tóth
Trudinger-type inequalities for double-phase functionals with variable exponents over metric measure spaces
Takao Ohno and Tetsu Shimomura
Weakly affine functions
Zoltán Boros and Péter Tóth
Measures of noncompactness in Hilbert $C^\ast$-modules
Dragoljub J. Kečkić and Zlatko Lazović
Explicit and mixed estimates for Thue inequalities with few coefficients
N. Saradha and Divyum Sharma
Generalized Randers metrics with special $1$-form
Amr Soleiman and Salah G. Elgendi
Solubility of additive quartic forms over $\mathbb{Q}_2(\sqrt{-5})$
Geovane Matheus Lemes Andrade and Drew Duncan
Some properties of the quadrinomials $p(z)=1+\kappa(z+z^{N-1})+z^N$ and $q(z)=1+\kappa(z-z^{N-1})-z^N$
Dmitriy Dmitrishin and Alexander Stokolos
On non-abelian extensions of Rota—Baxter algebras, dendriform algebras and Wells short exact sequence
Apurba Das and Nishant Rathee
Parallel covering of a square with equilateral triangles
Fengjiao Song and Zhanjun Su
On alienation of the sine and cosine addition formulas on semigroups
Bruce Ebanks