December 2007 Swipple Exhibits Art Stamp Invite Thing
Mail Art Show of artist stamps. E. F. Higgins III puts out a call, and this is what came in: wonderful work, from across the globe.
November 2007 Benjamin Duke Benjamin Duke New Work f(x) = x
identity matrix: a square matrix in which all the elements of the principal diagonal are ones and all other elements are zeros. The effect of multiplying a given matrix by an identity matrix is to leave the given matrix unchanged.