Alfréd Haar (1885-1933)

• Alfréd Haar at MacTutor.

• Alfred Haar at the Mathematics Genealogy Project.

• Alfréd Haar at Wikipedia.

• Haar, A., Zur Theorie der orthogonalen Funktionensysteme, (Erste Mitteilung), Math. Ann. 69 (1910), 331-371. This is Haar's thesis, written under the supervision of David Hilbert. Here we find, for example, the Haar orthonormal system. Here is an English translation by G. Zimmermann (published in Fundamental Papers in Wavelet Theory, Princeton University Press (2006), 155-188).

• Haar, A., Die Minkowskische Geometrie und die Annäherung an stetige Funktionen Math. Ann. 78 (1918), 294-311. Contains the Haar Theorem characterizing finite-dimensional unicity spaces in C(X).