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			A Mathematical Genealogy:
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  Otto Mencken					Gottfried Leibniz
        |						|
Johann Wichmannshausen 				 Jacob Bernoulli
        |						|
  Christian Hausen				 Johann Bernoulli
        |			 		        |
  Abraham Kaestner				  Leonhard Euler
        |						|
   Johann Pfaff 		 		  Joseph Lagrange
        |	    			       	   /	    	\
 Carl Friedrich Gauss	          Jean-Baptiste Fourier  Simeon Poisson 
	|					   \		   /
        |	    Karl von Langsdorf  	    \		  /
  Christian Gerling	      |  	    Gustav Lejeune-Dirichlet
        |		Martin Ohm			     /
  Julius Plucker		 \____ Rudolf Lipschitz ____/
            \     				 /
             \     				/
	      \_______ C. Felix Klein _________/
        		      |
		   C. L. Ferdinand Lindemann
        		      |
			 David Hilbert 
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		  	Richard Courant
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	  	      Kurt Otto Friedrichs
        		      |
	  	       Thomas I. Seidman