In[838]:=
Out[841]=
Converted by
Mathematica
(March 7, 2003)
![xy = {x, y} ; xyi = {-1/2, -1/2} ; xyj = {1/2, 1/4} ; ContourPlot[perim[xy, xyi, xyj], {x, -1, 1}, {y, -1, 1}]](../HTMLFiles/index_35.gif)
![[Graphics:../HTMLFiles/index_36.gif]](../HTMLFiles/index_36.gif)
