Braeburn of sweet and tart flavour. They are available October through April in the northern hemisphere and are medium to large in size. They are a popular fruit for growers because of their ability to store well when chilled. Braeburn apples are useful in cooking in that they hold their shape and do not release a great deal of liquid making them ideal for tarts. According to the US Apple Association website it is one of the fifteen most popular apple cultivars in the United States. Apples can be preserved by short, medium or long-term storage. Braeburn can turn brown inside
Morphism of algebraic varieties that the category of affine varieties can be identified with a full subcategory of affine schemes over "k". Since morphisms of varieties are obtained by gluing morphisms of affine varieties in the same way morphisms of schemes are obtained by gluing morphisms of affine schemes, it follows that the category of varieties is a full subcategory of the category of schemes over "k". For more details, see . A morphism between varieties is continuous with respect to Zariski topologies on the source and the target. The image of a morphism of varieties need not be open nor closed (for example,