ofComplex -- The complex of a face.

i1 : R=QQ[x_0..x_4];

i2 : C=simplex R

o2 = 4: x x x x x  
         0 1 2 3 4

o2 : complex of dim 4 embedded in dim 4 (printing facets)
     equidimensional, simplicial, F-vector {1, 5, 10, 10, 5, 1}, Euler = 0

i3 : F=C.fc_2_0

o3 = x x x
      0 1 2

o3 : face with 3 vertices

i4 : ofComplex F

o4 = 4: x x x x x  
         0 1 2 3 4

o4 : complex of dim 4 embedded in dim 4 (printing facets)
     equidimensional, simplicial, F-vector {1, 5, 10, 10, 5, 1}, Euler = 0