Singular

LIB "gfan.lib";
fan f=emptyFan(2);
f;
==> _application PolyhedralFan
==> _version 2.2
==> _type PolyhedralFan
==> 
==> AMBIENT_DIM
==> 2
==> 
==> DIM
==> -1
==> 
==> LINEALITY_DIM
==> 2
==> 
==> RAYS
==> 
==> N_RAYS
==> 0
==> 
==> LINEALITY_SPACE
==> 1 0	# 0
==> 0 1	# 1
==> 
==> ORTH_LINEALITY_SPACE
==> 
==> F_VECTOR
==> 
==> 
==> SIMPLICIAL
==> 1
==> 
==> PURE
==> 1
==> 
==> CONES
==> 
==> MAXIMAL_CONES
==>