"The authors provide an excellent presentation of the subject, and they manage to organize an impressive amount of material in such a way that, although they use a great variety of tools from various branches to prove the results, the work remains readable and thought-provoking. The book will be an indispensible resource for graduate students and researchers." (Antonis N. Manoussakis, Mathematical Reviews, January, 2017)

• A primer on injective Banach spaces.- Separably injective Banach spaces.- Spaces of universal disposition.- Ultraproducts of type L∞.- ℵ-injectivity.- Other weaker forms of injectivity.- Open Problems.

"The authors provide an excellent presentation of the subject, and they manage to organize an impressive amount of material in such a way that, although they use a great variety of tools from various branches to prove the results, the work remains readable and thought-provoking. The book will be an indispensible resource for graduate students and researchers." (Antonis N. Manoussakis, Mathematical Reviews, January, 2017)

• A primer on injective Banach spaces.- Separably injective Banach spaces.- Spaces of universal disposition.- Ultraproducts of type L∞.- ℵ-injectivity.- Other weaker forms of injectivity.- Open Problems.