Complex manifolds

A complex manifold is a Hausdorff space M which admits a covering by open sets Uα each of which is given with a homeomorphism

φα:Uα → VαCn
where n may depend on α and each Vα is an open subset of the ambient Euclidean space. The coordinate charts must be compatible in the sense that where defined the functions φβφ-1α are holomorphic.

The dimension of M is the maximal n appearing as the ambient dimension of one of its charts.