Hilbert space
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A Hilbert space is a mathematical concept covering the extra-dimensional use of Euclidean space in more than three dimensions. A Hilbert space uses the mathematics of two and three dimensions to describe outcomes in more than three dimensions. It is named after David Hilbert.
Vector algebra and calculus are methods normally used in the two-dimensional Euclidean plane and three-dimensional space. In Hilbert spaces these methods can be used with any finite or infinite number of dimensions. A Hilbert space is a vector space that has the structure of an inner product that allows length and angle to be measured. Hilbert spaces also have to be complete, which means that enough limits have to exist for calculus to work.
The earliest Hilbert spaces were studied in the first decade of the 20th century by David Hilbert, Erhard Schmidt, and Frigyes Riesz. John von Neumann first came up with the name "Hilbert Space". Hilbert space methods made a big difference to functional analysis.
Hilbert spaces show up a lot in mathematics, physics, and engineering, often as infinite-dimensional function spaces. They are especially useful for studying partial differential equations, quantum mechanics, and Fourier analysis (which includes signal processing and heat transfer). Hilbert spaces are used in ergodic theory which is the mathematical basis of thermodynamics. All normal Euclidean spaces are also Hilbert spaces. Other examples of Hilbert spaces include spaces of square-integrable functions, spaces of sequences, Sobolev spaces made up of generalized functions, and Hardy spaces of holomorphic functions.
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