Jörg was born in 1941 in Zurich, Switzerland. He received an MS in EE from the Swiss Federal Institute of Technology, Zurich, Switzerland, in 1965. His fields of interest are:
Hiking and mountaineering in the Swiss Alps; personal tops:
Matterhorn (4478 m)
Dufour Peak (Monte Rosa, 4634 m, top of Switzerland)
Dom (Mischabel, 4545 m)
Jogging; personal records:
100 m in 10.6 secs (1963)
10 km in 37 mins 39 secs (2002)
Half Marathon in 1 hr and 27 mins (1996)
Marathon in 3 hrs and 26 mins (2003)
Astronomy
His favorite unsolved mathematical problem was proposed in December 1973 by Martin Gardner in the Mathematical Games column of Scientific American, p. 118-121, «On expressing integers as the sum of cubes and other unsolved number-theory problems» [allowing each cube to be positive or negative], e.g. 45 = 4³ - 3³ + 2³ .
He’d appreciate very much any comments on three-cube solutions for the numbers 30, 33, 39, 42, 52, 74, 75 or 84. His favorite being 30 which he investigated in vain 30 years ago up to 10,000³ for the least cube. He wonders whether anybody has heard of any solution or disproof.