Design and construction of an all glass cube for the Raaks project in Haarlem (NL)

On a square in the old city center of Haarlem (NL) on top of an underground carpark garage a glass entrance building was designed by architect Kraayvanger Urbis.ABT/ Rob Nijsse developed the all glass structure for this spectacular building. Thefact that the stability was provided by the roof in combination with the four walls ofthe project makes it something special. Also the application of full glass rods in thestructure of the roof is an innovation in the world of making glass structures

Clemens' conjecture for octic and nonic curves

AbstractThe conjecture of C.H. Clemens, concerning the finiteness of the number of smooth rational curves of a certain degree on a general quintic threefold in P4, is proved for degrees 8 and 9 by studying the ruled surfaces on which the curves lie