User - MathOverflow most recent 30 from http://mathoverflow.net 2013-05-21T00:51:26Z http://mathoverflow.net/feeds/user/29765 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/116694/lattice-self-affine-tile Comment by 2012-12-18T20:18:40Z 2012-12-18T20:18:40Z let $\bigwedge$ be a lattice, if $A\bigwedge\subset\bigwedge$, then lattice is called $A-invariant$. And also; $D-D={d_i-d_j:d_i,d_j\epsilon D}$.