The Ideas of Hermann Grassmann in the Context of the Mathematical 

      and Philosophical Tradition Since Leibniz 

      Michael Otte ........................................................... 1



Newton's Mature Dynamics and the Principia: A Simplified 

      Solution to the Kepler Problem 

      J. Bruce Brackenridge ................................................. 36



P. L. Chebyshev (1821--1894) and His Contacts with Western 

      European Scientists 

      Paul L. Butzer and Fran\cois Jongmans ................................. 46



Sharaf al-Din al-Tusi on the Number of Positive Roots of Cubic 

      Equations 

      Jan P. Hogendijk ...................................................... 69



SOURCES      



Edmund Landau Memorabilia 

      Heinrich Wefelscheid .................................................. 86



REVIEWS      



Ada: A Life and a Legacy, by Dorothy Stein 

      (Karen Hunger Parshall) ............................................... 94



Leonhard Euler, Opera Omnia, edited by Pierre Costabel, Eduard  

      Winter, A$\check{s}$ot T. Grigorijan, and Adolph P. Juskevic      

      (Mary Terrall) ........................................................ 96



      ABSTRACTS.............................................................. 98                              

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