An alternating permutation of length n is a permutation π = π1π2 · · ·πn such that π1 < π2 > π3 < π4 > · · · . Let An denote the set of alternating permutations of {1, 2, . . . , n}, and let An(σ) be the set of alternating permutations in An that avoid a pattern σ. Recently, Lewis used generating trees to enumerate A2n(1234), A2n(2143) and A2n+1(2143), and he posed some conjectures on the Wilf-...

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Purpose: General reduction of differential light sensitivity in glaucoma is a controversial issue. Purely diffuse visual field loss is not a sign of glaucoma, but it has been postulated that the best parts m the visual field are always affected to some extent. We studied the best parts of the visual field in a material of glaucomatow visual fields. Methods: Humphrey 30-2 threshold tests from 19...

The results of EXAFS measurements at 300 K for the superconducting compounds Tl0.75Cu0.25Ba2Ca3Cu4Oy [Tl-1234], TlBa2Ca3Cu4Oy [Tl-1212], and CuBa2Ca3Cu4Oy [Cu-1234]. are reported. We have measured the EXAFS spectrum for Tl0.75Cu0.25Ba2Ca3Cu4Oy in the range 10K-300K, however here we limit our discussion to the spectrum at 300 K. This material is prepared under high pressure [3.5 GPa] from precur...

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7 Article history: 8 Received 15 November 2012 9 Received in revised form 25 January 2013 10 Accepted 29 January 2013 11 Available online xxxx 1234 15 JEL classification: 16 C15 17 C32 18 G13 19 G15 20