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Fourier series - Wikipedia
1 天前 — A Fourier series (/ ˈ f ʊr i eɪ,-i ər / [1]) is an expansion of a periodic function into a sum of trigonometric functions.The Fourier series is an example of a trigonometric series, but not all …
Algebra - Wikipedia
4 小时之前 — Algebra is the branch of mathematics that studies algebraic structures and the operations they use. [1] An algebraic structure is a non-empty set of mathematical objects, …
Henri Poincaré - Wikipedia
1 天前 — Jules Henri Poincaré (UK: / ˈ p w æ̃ k ɑːr eɪ /, US: / ˌ p w æ̃ k ɑː ˈ r eɪ /; French: [ɑ̃ʁi pwɛ̃kaʁe] ⓘ; [1] [2] [3] 29 April 1854 – 17 July 1912) was a French mathematician, theoretical …
