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01 natural sciences 1,590 0101 mathematics 1,581 best approximation, chebyshev systems 1,067 applied mathematics 623 analysis 610 numerical analysis 561 more ... mathematics(all) 540 geometry and structure of normed linear spaces 255 approximation by polynomials 210 approximation by other special function classes 190 spline approximation 175 interpolation in approximation theory 170 approximation by operators (in particular, by integral operators) 158 best approximation 144 rate of convergence, degree of approximation 140 02 engineering and technology 133 metric projection 121 spaces of measurable functions (\(l^p\)-spaces, orlicz spaces, kothe function spaces, lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.) 119 approximation by positive operators 118 banach lattices 105 normed linear spaces and banach spaces 95 sobolev spaces and other spaces of ''smooth' functions, embedding theorems, trace theorems 90 0103 physical sciences 88 approximation by arbitrary nonlinear expressions 85 widths and entropy 85 uniqueness of best approximation 83 0211 other engineering and technologies 81 510.mathematics 81 article 81 trigonometric approximation 79 less ...

elsevier bv 693 springer science and business media llc 491 american mathematical society (ams), providence, ri 90 russian academy of sciences - ras (rossiiskaya akademiya nauk - ran), v. a. steklov mathematical institute (matematicheskii institut im. v. a. steklova), moscow; nauka, moscow 67 wiley 67 american mathematical society (ams) 61 more ... taylor \& francis, philadelphia, pa 57 steklov mathematical institute 56 society for industrial & applied mathematics (siam) 48 cambridge university press (cup) 45 jstor 38 springer us, new york, ny; pleiades publishing, new york, ny; maik ``nauka/interperiodica'', moscow 35 editura academiei republicii socialiste romania, cluj-napoca 34 institute of mathematics, polish academy of sciences 32 elsevier (academic press), san diego, ca 31 gauthier-villars, paris 26 bulgarian academy of sciences - bas (balgarska akademiya na naukite - ban), sofia 23 publishing house of the romanian academy (editura academiei romane), bucharest 23 springer india, new delhi, delhi, india; indian national science academy, new delhi, delhi, india 23 walter de gruyter gmbh 21 dalian university of science and technology, dalian 20 mathematical sciences publishers 20 springer us, new york, ny; pleiades publishing (allerton press), new york, ny; maik ``nauka/interperiodica'', moscow 20 russian academy of sciences - ras (rossiiskaya akademiya nauk - ran), moscow; nauka, moscow 19 allerton press, inc., new york 18 nanjing university, nanjing; kluwer academic publishers, dordrecht 18 izdatel'stvo nauka, moskva 16 kazan (volga region) federal university (kazanskii (privolzhskii) federal'nyi universitet), kazan 15 academia sinica, institute of mathematics, beijing; chinese mathematical society, beijing 14 darba, sofia 14 less ...

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