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classification 1compact quotients 1discrete subgroups 1isometry groups 1pseudo-riemannian geometry 1symmetric spaces 1

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math.DG2026

Pseudo-Riemannian symmetric spaces of signature (2,2)

Ines Kath, Matti Lyko

The paper classifies all four‑dimensional simply‑connected indecomposable non‑semisimple pseudo‑Riemannian symmetric spaces with signature (2,2), provides explicit models, computes…