Carl Theodor Anger (
Danzig, 31 July 1803 – Danzig, 25 March 1858) was a German
mathematician
A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...
and
astronomer
An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...
. He was a student of and assistant to
Friedrich Bessel
Friedrich Wilhelm Bessel (; 22 July 1784 – 17 March 1846) was a German astronomer, mathematician, physicist, and geodesy, geodesist. He was the first astronomer who determined reliable values for the distance from the Sun to another star by th ...
at the
Königsberg Observatory
Koenigsberg Observatory (; obs. code: 058) was an astronomical observatory and research facility which was attached to the Albertina University in Königsberg, what is now Kaliningrad, Russia. The observatory was destroyed by Royal Air Force bo ...
from 1827 until 1831. Thereafter, he was appointed as astronomer by the
Naturforschende Gesellschaft in Danzig.
[Brandstäter (1858).]
Besides his scientific work, especially that related to
Bessel function
Bessel functions, named after Friedrich Bessel who was the first to systematically study them in 1824, are canonical solutions of Bessel's differential equation
x^2 \frac + x \frac + \left(x^2 - \alpha^2 \right)y = 0
for an arbitrary complex ...
s, he is also known for his first-hand biographical notes on the life of Bessel.
Publications
*
*
*
*
See also
*
Anger function
In mathematics, the Anger function, introduced by , is a function defined as
: \mathbf_\nu(z)=\frac \int_0^\pi \cos (\nu\theta-z\sin\theta) \,d\theta
with complex parameter \nu and complex variable \textit. It is closely related to the Bessel fun ...
*
Jacobi–Anger expansion
In mathematics, the Jacobi–Anger expansion (or Jacobi–Anger identity) is an expansion of exponentials of trigonometric functions in the basis of their harmonics. It is useful in physics (for example, to plane wave expansion, convert between pla ...
Notes
References
*
*
*
External links
*
ADB:Anger, Karl Theodor – Wikisource*
Franz Kössler's Personlexikon von Lehren des 19. Jahrhunderts (Abbehusen – Axt); Anger, Karl Theodor: bibliography with 41 entries
1803 births
1858 deaths
19th-century German mathematicians
19th-century German astronomers
Scientists from Gdańsk
People from West Prussia
Mathematicians from the Kingdom of Prussia
{{Germany-astronomer-stub