Person: Vályi, Gyula
Gyula Vályi was a Hungarian mathematician and theoretical physicist known for his work on mathematical analysis, geometry and number theory.
Mathematical Profile (Excerpt):
 Vályi was born in Marosvásárhely, which was a famous town for any Hungarian mathematician to be born in given the connection with Farkas Bolyai and János Bolyai.
 The University of Kolozsvár was a newly established university when Vályi entered it, being founded in 1872.
 After qualifying as a teacher of mathematics and physics from the University of Kolozsvár, Vályi was awarded a scholarship to allow him to undertake further study abroad.
 Vályi was appointed professor of theoretical physics at Kolozsvár in 1884, and in the following year he also became professor of mathematics lecturing on analysis, geometry and number theory.
 Vályi asked which triangles are similar to their nnnth pedal triangle (that is, they have the same angles).
 Vályi also made extensive studies of projective geometry, in particular studying polar reciprocity, and used elliptic functions to study third order curves.
 Vályi showed that there are precisely five triangles with this property.
 Vályi's eyesight deteriorated rapidly and he had to lecture without notes for he could not read them.
 Vályi's lectures did not always follow the same pattern.
 There were two courses of Vályi which hardly changed over time.
 One of them presented the basic theory of functions; in it Vályi followed his old master Weierstrass and included the theory of elliptic functions.
 The other concerned with János Bolyai's "Appendix"; in that course Vályi, especially in the first years stuck to the order and contents of the sections of Bolyai's masterpiece.
 Vályi remained in Kolozsvár all his life despite being offered a professorship in Budapest.
 Vályi's accomplishment, however, is outstanding and lasting ...
Born 25 January 1855, Marosvásárhely, Transylvania, Hungary (now TârguMureș, Romania). Died 13 October 1913, Kolozsvár, Hungary (now Cluj, Romania).
View full biography at MacTutor
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References
Adapted from other CC BYSA 4.0 Sources:
 O’Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive