Part I. Spherical and hyperbolic geometries
Area in non-Euclidean geometry / Norbert A’Campo and Athanase Papadopoulos
The area formula for hyperbolic triangles / Elena Frenkel and Weixu Su
On a problem of Schubert in hyperbolic geometry / Vincent Alberge and Elena Frenkel
On a theorem of Lambert: medians in spherical and hyperbolic geometries / Himalaya Senapati
Inscribing a triangle in a circle in spherical geometry / Himalaya Senapati
Monotonicity in spherical and hyperbolic triangles / Himalaya Senapati
De Tilly’s mechanical view on hyperbolic and spherical geometries / Dmitriy Slutskiy
The Gauss–Bonnet theorem and the geometry of surfaces / Son Lam Ho
On the non-existence of a perfect map from the 2-sphere to the Euclidean plane / Charalampos Charitos and Ioannis Papadoperakis
Area preserving maps from the sphere to the Euclidean plane / Charalampos Charitos
Area and volume in non-Euclidean geometry / Nikolay Abrosimov and Alexander Mednykh
Statics and kinematics of frameworks in Euclidean and non-Euclidean geometry / Ivan Izmestiev
Part II. Projective geometries
Contributions to non-Euclidean geometry I / Eduard Study (translated by Annette A'Campo-Neuen
Notes on Eduard Study’s paper “Contributions to non-Euclidean geometry I” / Annette A’Campo-Neuen and Athanase Papadopoulos
Spherical and hyperbolic conics / Ivan Izmestiev
Spherical, hyperbolic, and other projective geometries: convexity, duality, transitions / François Fillastre and Andrea Seppi
Hermitian trigonometry / Boumediene Et-Taoui
A theorem on equiareal triangles with a fixed base / Victor Pambuccian.
