We prove that if E âŠ‚ R2d , for d 2, is an Ahlforsâ€“David regular product set of sufficiently large Hausdorff dimension, denoted by dimH(E), and Ï† is a sufficiently regular function, then the upperâ€¦ (More)

The urinary excretion of hydroxyproline, the bulk of which arises from collagen, has been increasingly used as an index of the turnover of bone matrix (Z IFF et al., ig56 ; DULL and HE NN EMA,zg6 3 ;â€¦ (More)

We prove that if Ï† : R Ã— R â†’ R, d â‰¥ 2, is a homogeneous function, smooth away from the origin and having nonzero Mongeâ€“Ampere determinant away from the origin, then R#{(n,m) âˆˆ Z Ã— Z : |n|, |m| â‰¤ CR;Râ€¦ (More)