منابع مشابه
Hesse and the Jacobian Conjecture
In this paper we give a survey of various recent results obtained by the authors in the study of the Jacobian Conjecture. It is shown that it suffices to investigate the conjecture for polynomial maps of the form x+H with JH nilpotent and symmetric (and one may even assume that H is homogeneous of degree 3). Furthermore it is shown that for such maps the Jacobian Conjecture is true if n ≤ 4 and...
متن کاملFINE GREENS and FAIRWAYS
mowing. It is run along the ground on one large wheel which is f ree of the motor operat ing the cutter bar. I t can be tilted to cut up or down slopes and can be pivoted sharply in any direction. It has been found part icularly valuable for cutting around trees, boulders, t raps, creek-bottoms, and other golf course obstructions which formerly required hand cutt ing. The motor scythe, powered ...
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ژورنال
عنوان ژورنال: Nature
سال: 1982
ISSN: 0028-0836,1476-4687
DOI: 10.1038/299387b0