Hilbert space
Hilbert spaces can be used to study the harmonics of vibrating strings.
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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