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gap> ps := ProjectiveSpace(6,7);
ProjectiveSpace(6, 7)
gap> ElementsOfIncidenceStructure(ps,1);
<points of ProjectiveSpace(6, 7)>
gap> ElementsOfIncidenceStructure(ps,2);
<lines of ProjectiveSpace(6, 7)>
gap> ElementsOfIncidenceStructure(ps,3);
<planes of ProjectiveSpace(6, 7)>
gap> ElementsOfIncidenceStructure(ps,4);
<solids of ProjectiveSpace(6, 7)>
gap> ElementsOfIncidenceStructure(ps,5);
<proj. 4-subspaces of ProjectiveSpace(6, 7)>
gap> ElementsOfIncidenceStructure(ps,6);
<proj. 5-subspaces of ProjectiveSpace(6, 7)>
gap> ElementsOfIncidenceStructure(ps,7);
Error, <ps> has no elements of type <j> called from
<function "unknown">( <arguments> )
called from read-eval loop at line 15 of *stdin*
you can 'quit;' to quit to outer loop, or
you can 'return;' to continue
brk> quit;
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