On Green's lemma

Genes, greens, and homocysteine.

Nitrogen Uptake and Leaching on Greens

Superintendents know that management of putting greens is an art. Greens are often made of high-porosity sand that does not retain water or nutrients very effectively. Also, putting green grasses are cut extremely short, which does not allow a deep root system to develop and take up nutrients from deep in the soil profile. Therefore, putting greens require frequent irrigation and fertilizer app...

Variations on Barbalat's Lemma

We first review recent versions of Barbălat's Lemma by comparing their proofs and by discussing a concrete example. Then we present a proof which allows for a quantitative interpretation. In 1959, Barbălat formalized the intuitive principle that a function whose integral up to infinity exists and whose oscillation is bounded needs to be small at infinity. Theorem 1. (Barbălat's Lemma [2, p. 269...

On the Hopf Lemma

The Hopf Lemma for second order elliptic operators is proved to hold in domains with C, and even less regular, boundaries. It need not hold for C boundaries. Corresponding results are proved for second order parabolic operators.

FINE 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 ...