The country south of the Drave is occupied by several groups of the southern limestone zone, namely the Carnic Alps, the Julian Alps, the Karawankes and the Steiner Alps.
South of the Drave Styria is traversed by the following ramifications of the southern zone of the eastern Alps: the Bacher Gebirge with the Cerni Vrch or Schwarzer Berg (5078 ft.), and the Sannthaler or Steiner Alps with the Oistriza (77 0 9 ft.) and the highest peak of the group, the Grintovc or Grintouz (8429 ft.), which is situated on the threefold boundary of Carinthia, Carniola and Styria.
It is traversed by the Julian Alps, the Karawankas and the Steiner Alps, which belong all to the southern zone of the Eastern Alps.
Starting from simple elementary propositions, Steiner advances to the solution of problems which analytically require the calculus of variation, but which at the time altogether surpassed the powers of that calculus.
In 1868 he was awarded the Steiner prize of the Berlin Academy for a geometrical memoir, Sur quelques problemes cubiques et biquadratiques.
Kekule, in 1858, concluded that it was nitroacetonitrile, NO 2 CH 2 CN, a view opposed by Steiner (1883), E.
Its principal affluents are the Kanker and the Steiner Feistritz on the left, and the Zeyer or Sora, the Laibach and the Gurk on the right.
The Ursula Berg (5563 ft.) ends the group of the Karawankas, which are continued by the Steiner Alps.