Jacob Siehler
Mathematics Department Washington & Lee University Email: siehlerj@wlu.edu Office: Robinson Room 4 
Home  SpaceCurve  Spivak  Mathematica  Perl 
Tangent plane to a torus  Geodesic on a stretched wireframe torus  Geodesic segment and principal curvatures on a pseudosphere  Tangent plane on an annular section of a saddle surface 
2xNadjacencyfree.nb, PDF Enumerating selections from a 2xN grid with no horizontal or vertical adjacency.  
cpanimate.nb A notebook for demonstrating how the critical point structure of a 1parameter family of functions changes as you vary the parameter. You get an animation showing the graph of the function beside its contour map; the zero sets of the partials are colorcoded, and critical points are identified, classified by the 2nd derivative test, and displayed both on the contour map and the graph of the function. Watch critical points appear, split, merge, and disappear as the parameter changes. I really like this one.  
levelsets.nb Level sets of a function of a function of two variables shown on the graph of the function and in a contour map simultaneously; step through the animation and watch the topology of the level sets change as you pass through critical heights.  
osculating3d.nb Moving frame and osculating circle animations for space curves. 

osculating2d.nb Moving frame and osculating circle animations for plane curves. 
registrar.pl  Downloads my class rolls from the registrar's site into Excelreadable files. 
sneeze.pl  Generates this important table of data. 
arxivkeywords.pl  Generates selective RSS feeds from the arXiv What's New page 