nLab: Banach Space
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The nLab entry on Banach spaces: complete normed vector spaces, with their basic examples, bounded linear maps, and the categories Ban they form, plus links to related constructions. Best for readers comfortable with functional analysis who want the category-theoretic framing.
More resources on Banach Spaces
Wolfram MathWorld
MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.
Terry Tao's Blog on Banach Spaces
A tag archive on Terence Tao's blog, currently holding one post that uses the closed graph theorem to show a vector space admits at most one compatible Banach norm. Suited to readers who know basic functional analysis and want a short, rigorous example.
Functional Analysis
Walter Rudin's graduate text on functional analysis, covering topological vector spaces, distributions and Fourier transforms, Banach algebras, and spectral theory of operators on Hilbert space. Readers learn the abstract framework underlying modern analysis and PDE, with demanding exercises.
Functional Analysis: An Introduction
An AMS graduate textbook introducing functional analysis through Banach and Hilbert spaces, the Hahn–Banach, open mapping and uniform boundedness theorems, compact operators, and spectral theory. It suits students finishing real analysis who want a structured first course with exercises.