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The doubled formulation of the worldsheet provides a description of stringtheory in which T-duality is promoted to a manifest symmetry. Here we extendthis approach to $\mathcal{N}=(2,2)$ superspace providing a doubled formulationfor bi-Hermitian/generalised K\"ahler target spaces. The theory is described bya single function, a doubled-generalised K\"ahler potential, supplemented witha manifestly $\mathcal{N}=(2,2)$ constraint. Several examples serve toillustrate this construction, including a discussion of the $\mathcal{N}=(2,2)$description of T-folds.

Doubled space and extended supersymmetry