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D.13.2.31 negatedCone

Procedure from library gfan.lib (see gfan_lib).

Usage:
negatedCone(c); c cone

Return:
cone, the negative of c

Example:
 
LIB "gfan.lib";
intmat M[2][2]=
1,0,
0,1;
cone c=coneViaPoints(M);
cone cn=negatedCone(c);
print(rays(cn));
==> -1, 0,
==>  0,-1

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