Danilo Blanusa
Danilo Blanua (December 7 1903 - August 8 1987) was a Croatian mathematician, physicist, engineer and a professor at the University of Zagreb.
Blanua was born in Osijek and attended the elemmentary school in Vienna and Steyer in Austria and gymnasium in Osijek and Zagreb. He studied engineering in both Zagreb and Vienna and als mathematics and physics. His career started in Zagreb where he started to work and lecture. Blanua received the Ruder Boskovic in 1960.
Mathematics
In mathematics, he discovered the only seconds solution of the four color problem - four color theorem. In mathematical terms, the solution is in the form of the graphicone must have the characteristic that from every node there are three branches coming out whom it is impossible to colour in three different colours so that all three colours would come out from one point. This graph was published in 1946. The English term "snark" meaning - mysterious, imaginary, is mathematical slang for a solution since these graphs are very difficult to discover. This discovery made by Blanua has triggered a whole new area of the graph theory, and made him one of the most famous mathematicians coming from Zagreb.
Blanua's most important works were related to isometric immersions of two-dimensional Lobachevsky plane into six-dimensional Euclid ean space and generalizations, in the theory of the special functions (Bassel function), in diferential geometry, in the graph theory. His result are included in the Japanese mathematical encyclopedia Sugaku jiten in Tokyo, ( 1962) published by Iwanami shoten
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=(1-v2/c2)1/2
in the relation ---> Q=Q0a, T=T0a
realy 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 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
Referenced By
List of Croatians | List of Croats | List of mathematicians
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