 Danilo Blanuša

Danilo Blanuša (December 7, 1903 – August 8, 1987) was a Croatian mathematician, physicist, engineer and a professor at the University of Zagreb. He was Serb and he was born in AustroUgarska monarchy (today Croatia).
Blanuša was born in Osijek and attended elementary school in Vienna and Steyer in Austria and gymnasium in Osijek and Zagreb. He studied engineering in both Zagreb and Vienna and also mathematics and physics. His career started in Zagreb, where he started to work and lecture. Blanuša was the dean of the Faculty of Electrical Engineering, Zagreb in the 195758 school year. He received the Ruđer Bošković prize in 1960.
Mathematics
In mathematics, Blanuša became known for discovering the second and third known snarks in 1946 (the Petersen graph was the first), triggering a new area of graph theory. The study of snarks had its origin in the 1880 work of P. G. Tait, who at that time had proved that the four color theorem is equivalent to the statement that no snark is planar. Snarks were so named later by the American mathematician Martin Gardner in 1976, after the mysterious and elusive object of Lewis Carroll's poem The Hunting of the Snark.
Blanuša's most important works were related to isometric immersions of twodimensional Lobachevsky plane into sixdimensional Euclidean space and generalizations, in the theory of the special functions (Bessel functions), in differential geometry, and in graph theory. His results are included in the Japanese mathematical encyclopedia Sugaku jiten in Tokyo, published by Iwanami Shoten in 1962.
His Erdős number is 6.
Physics
His works were mostly related to the theory of relativity. He discovered a mistake in relations for absolute heat Q and temperature T in relativistic phenomenological thermodynamics, published by Max Planck in Annalen der Physik in 1908.
 Q0 and T0 are the corresponding classical values, and a=(1v_{2}/c_{2})^{1/2}
in the relation → Q=Q0a, T=T0a really should be → Q=Q0/a, T=T0/a
This correction was published in Glasnik, the journal relating to mathematics, physics and astronomy in 1947 in the article "Sur les paradoxes de la notion d'énergie". It was rediscovered in 1960, and the correction is still wrongly attributed to H. Ott in the mainstream scientific literature.
External links
Categories: 20thcentury mathematicians
 Croatian mathematicians
 Croatian engineers
 1903 births
 1987 deaths
 Members of the Croatian Academy of Sciences and Arts
 University of Zagreb faculty
 Faculty of Science, University of Zagreb alumni
 People from Osijek
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