<?xml version="1.0" encoding="utf-8" ?> <!-- for emacs: -*- coding: utf-8 -*- --> <!-- Apache may like this line in the file .htaccess: AddCharset utf-8 .html --> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg-flat.dtd" > <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head><title>SheafOfRings ^ List -- make a graded free coherent sheaf</title> <link rel="stylesheet" type="text/css" href="../../../../Macaulay2/Style/doc.css"/> </head> <body> <table class="buttons"> <tr> <td><div><a href="_shield.html">next</a> | <a href="___Sheaf__Of__Rings.html">previous</a> | <a href="_shield.html">forward</a> | <a href="___Sheaf__Of__Rings.html">backward</a> | up | <a href="index.html">top</a> | <a href="master.html">index</a> | <a href="toc.html">toc</a> | <a href="http://www.math.uiuc.edu/Macaulay2/">Macaulay2 web site</a></div> </td> </tr> </table> <hr/> <div><h1>SheafOfRings ^ List -- make a graded free coherent sheaf</h1> <div class="single"><h2>Synopsis</h2> <ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>M = R^{i,j,k,...}</tt></div> </dd></dl> </div> </li> <li><span>Operator: <a href="_^.html" title="a binary operator, usually used for powers">^</a></span></li> <li><div class="single">Inputs:<ul><li><span><tt>R</tt>, <span>a <a href="___Sheaf__Of__Rings.html">sheaf of rings</a></span></span></li> <li><span><tt>{i,j,k, ...}</tt>, <span>a <a href="___List.html">list</a></span>, of integers or lists of integers</span></li> </ul> </div> </li> <li><div class="single">Outputs:<ul><li><span><span>a <a href="___Module.html">module</a></span>, , a graded free coherent sheaf whose generators have degrees <tt>-i</tt>, <tt>-j</tt>, <tt>-k</tt>, ...</span></li> </ul> </div> </li> </ul> </div> <div class="single"><h2>Description</h2> <div><table class="examples"><tr><td><pre>i1 : R = QQ[a..d]/(a*b*c*d) o1 = R o1 : QuotientRing</pre> </td></tr> <tr><td><pre>i2 : X = Proj R o2 = X o2 : ProjectiveVariety</pre> </td></tr> <tr><td><pre>i3 : OO_X^{-1,-2,3} 1 1 1 o3 = OO (-1) ++ OO (-2) ++ OO (3) X X X o3 : coherent sheaf on X, free</pre> </td></tr> </table> <p/> If <tt>i</tt>, <tt>j</tt>, ... are lists of integers, then they represent multi-degrees, as in <a href="_graded_spand_spmultigraded_sppolynomial_springs.html" title="">graded and multigraded polynomial rings</a>.<table class="examples"><tr><td><pre>i4 : Y = Proj (QQ[x,y,z,Degrees=>{{1,0},{1,-1},{1,-2}}]) o4 = Y o4 : ProjectiveVariety</pre> </td></tr> <tr><td><pre>i5 : OO_Y^{{1,2},{-1,3}} 1 1 o5 = OO (1,2) ++ OO (-1,3) Y Y o5 : coherent sheaf on Y, free</pre> </td></tr> <tr><td><pre>i6 : degrees oo o6 = {{-1, -2}, {1, -3}} o6 : List</pre> </td></tr> </table> </div> </div> <div class="single"><h2>See also</h2> <ul><li><span><a href="___O__O_sp_us_sp__Variety.html" title="the structure sheaf">OO</a> -- the structure sheaf</span></li> <li><span><a href="___Proj_lp__Ring_rp.html" title="make a projective variety">Proj</a> -- make a projective variety</span></li> <li><span><a href="_degrees.html" title="degrees of generators">degrees</a> -- degrees of generators</span></li> <li><span><a href="_graded_spand_spmultigraded_sppolynomial_springs.html" title="">graded and multigraded polynomial rings</a></span></li> </ul> </div> </div> </body> </html>