Bernstein's constant
Bernstein's constant, usually denoted by the Greek letter β (beta), is a mathematical constant named after Sergei Natanovich Bernstein and is equal to 0.2801694990... (sequence A073001 in the OEIS).
| Binary | 0.01000111101110010011000000110011… |
| Decimal | 0.280169499… |
| Hexadecimal | 0.47B930338AAD… |
| Continued fraction |
Definition
Let En(ƒ) be the error of the best uniform approximation to a real function ƒ(x) on the interval [−1, 1] by real polynomials of no more than degree n. In the case of ƒ(x) = |x|, Bernstein (1914) showed that the limit
called Bernstein's constant, exists and is between 0.278 and 0.286. His conjecture that the limit is:
was disproven by Varga & Carpenter (1987), who calculated
gollark: Aegogogogs?
gollark: Also, who cares, the meaning is clear even with aegisons (my newly preferred form).
gollark: This is, in fact, English and not Greek.
gollark: Aegolon.
gollark: Aegees.
References
- Bernstein, S. N. (1914), "Sur la meilleure approximation de x par des polynomes de degrés donnés" (PDF), Acta Math., 37: 1–57, doi:10.1007/BF02401828
- Varga, Richard S.; Carpenter, Amos J. (1987), "A conjecture of S. Bernstein in approximation theory", Math. USSR Sbornik, 57 (2): 547–560, doi:10.1070/SM1987v057n02ABEH003086, MR 0842399
- Weisstein, Eric W. "Bernstein's Constant". MathWorld.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.