1. Solar and lunar observations at Istanbul in the 1570s

   • S. Mohammad Mozaffari
   • John M. Steele

   OriginalPaper 28 April 2015 Pages: 343 - 362

   

2. Variations on a theme: Clifford’s parallelism in elliptic space

   • Alberto Cogliati

   OriginalPaper 12 May 2015 Pages: 363 - 390

3. L’arithmétique des fractions dans l’œuvre de Fibonacci: fondements & usages

   • Marc Moyon
   • Maryvonne Spiesser

   OriginalPaper 03 June 2015 Pages: 391 - 427