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The graph JK?KQSSHN_?

This graph is embeddable. It is even 5-grid embeddable.

Embedding

An embedding of this graph is given by.

  1. (4, -2, -2)
  2. (4, 0, 0)
  3. (0, 4, 4)
  4. (4, 4, 4)
  5. (4, 0, -2)
  6. (2, 2, 4)
  7. (2, 0, 4)
  8. (0, 4, 0)
  9. (4, -4, 0)
  10. (4, 4, -4)
  11. (0, 4, -4)

Reduce script

Embeddability of the graph reduces to the truth of a formula over the reals, which can be decided with the reduce algebra package using the following script.

load_package redlog;
rlset R;

procedure d(x,y);
    (first x) * (first y) +
    (second x) * (second y) +
    (third x) * (third y);

procedure k(x,y);
    {(second x)*(third y) - (third x)*(second y),
     (third x)*(first y) - (first x)*(third y),
     (first x)*(second y) - (second x)*(first y)};

v0c1 := 1; v0c2 := 0; v0c3 := 0;
v1c1 := 0; v1c2 := 1; v1c3 := 0;

v0 := {v0c1, v0c2, v0c3}; 
v1 := {v1c1, v1c2, v1c3}; 
v2 := {v2c1, v2c2, v2c3}; 
v3 := {v3c1, v3c2, v3c3}; 
v3c2 := 0;
neq0 := k(k(k(k(v2,v0),v2),k(v0,v1)),v0); 
neq1 := k(k(k(k(v2,v0),v2),k(v0,v1)),v1); 
neq2 := k(k(k(k(v2,v0),v2),k(v0,v1)),v2); 
neq3 := k(k(k(k(v2,v0),v2),k(v0,v1)),k(v3,v2)); 
neq4 := k(k(k(k(v2,v0),v2),k(v0,v1)),k(v2,v0)); 
neq5 := k(k(k(k(v2,v0),v2),k(v0,v1)),k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)))); 
neq6 := k(k(k(k(v2,v0),v2),k(v0,v1)),v3); 
neq7 := k(v0,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1))); 
neq8 := k(v0,v2); 
neq9 := k(v0,k(v3,v2)); 
neq10 := k(v0,k(k(v2,v0),v2)); 
neq11 := k(v0,k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)))); 
neq12 := k(v0,v3); 
neq13 := k(v1,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1))); 
neq14 := k(v1,v2); 
neq15 := k(v1,k(v3,v2)); 
neq16 := k(v1,k(k(v2,v0),v2)); 
neq17 := k(v1,k(v2,v0)); 
neq18 := k(v1,k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)))); 
neq19 := k(k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)),v2); 
neq20 := k(k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)),k(v3,v2)); 
neq21 := k(k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)),k(k(v2,v0),v2)); 
neq22 := k(k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)),k(v2,v0)); 
neq23 := k(k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)),v3); 
neq24 := k(v2,k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)))); 
neq25 := k(v2,v3); 
neq26 := k(v2,k(v0,v1)); 
neq27 := k(k(v3,v2),k(k(v2,v0),v2)); 
neq28 := k(k(v3,v2),k(v2,v0)); 
neq29 := k(k(v3,v2),k(v0,v1)); 
neq30 := k(k(k(v2,v0),v2),k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)))); 
neq31 := k(k(k(v2,v0),v2),v3); 
neq32 := k(k(k(v2,v0),v2),k(v0,v1)); 
neq33 := k(k(v2,v0),k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)))); 
neq34 := k(k(v2,v0),v3); 
neq35 := k(k(v2,v0),k(v0,v1)); 
neq36 := k(k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1))),k(v0,v1)); 
neq37 := k(v3,k(v0,v1)); 
phi := 
       (first neq0 neq 0 or
        second neq0 neq 0 or
        third neq0 neq 0) and 
       (first neq1 neq 0 or
        second neq1 neq 0 or
        third neq1 neq 0) and 
       (first neq2 neq 0 or
        second neq2 neq 0 or
        third neq2 neq 0) and 
       (first neq3 neq 0 or
        second neq3 neq 0 or
        third neq3 neq 0) and 
       (first neq4 neq 0 or
        second neq4 neq 0 or
        third neq4 neq 0) and 
       (first neq5 neq 0 or
        second neq5 neq 0 or
        third neq5 neq 0) and 
       (first neq6 neq 0 or
        second neq6 neq 0 or
        third neq6 neq 0) and 
       (first neq7 neq 0 or
        second neq7 neq 0 or
        third neq7 neq 0) and 
       (first neq8 neq 0 or
        second neq8 neq 0 or
        third neq8 neq 0) and 
       (first neq9 neq 0 or
        second neq9 neq 0 or
        third neq9 neq 0) and 
       (first neq10 neq 0 or
        second neq10 neq 0 or
        third neq10 neq 0) and 
       (first neq11 neq 0 or
        second neq11 neq 0 or
        third neq11 neq 0) and 
       (first neq12 neq 0 or
        second neq12 neq 0 or
        third neq12 neq 0) and 
       (first neq13 neq 0 or
        second neq13 neq 0 or
        third neq13 neq 0) and 
       (first neq14 neq 0 or
        second neq14 neq 0 or
        third neq14 neq 0) and 
       (first neq15 neq 0 or
        second neq15 neq 0 or
        third neq15 neq 0) and 
       (first neq16 neq 0 or
        second neq16 neq 0 or
        third neq16 neq 0) and 
       (first neq17 neq 0 or
        second neq17 neq 0 or
        third neq17 neq 0) and 
       (first neq18 neq 0 or
        second neq18 neq 0 or
        third neq18 neq 0) and 
       (first neq19 neq 0 or
        second neq19 neq 0 or
        third neq19 neq 0) and 
       (first neq20 neq 0 or
        second neq20 neq 0 or
        third neq20 neq 0) and 
       (first neq21 neq 0 or
        second neq21 neq 0 or
        third neq21 neq 0) and 
       (first neq22 neq 0 or
        second neq22 neq 0 or
        third neq22 neq 0) and 
       (first neq23 neq 0 or
        second neq23 neq 0 or
        third neq23 neq 0) and 
       (first neq24 neq 0 or
        second neq24 neq 0 or
        third neq24 neq 0) and 
       (first neq25 neq 0 or
        second neq25 neq 0 or
        third neq25 neq 0) and 
       (first neq26 neq 0 or
        second neq26 neq 0 or
        third neq26 neq 0) and 
       (first neq27 neq 0 or
        second neq27 neq 0 or
        third neq27 neq 0) and 
       (first neq28 neq 0 or
        second neq28 neq 0 or
        third neq28 neq 0) and 
       (first neq29 neq 0 or
        second neq29 neq 0 or
        third neq29 neq 0) and 
       (first neq30 neq 0 or
        second neq30 neq 0 or
        third neq30 neq 0) and 
       (first neq31 neq 0 or
        second neq31 neq 0 or
        third neq31 neq 0) and 
       (first neq32 neq 0 or
        second neq32 neq 0 or
        third neq32 neq 0) and 
       (first neq33 neq 0 or
        second neq33 neq 0 or
        third neq33 neq 0) and 
       (first neq34 neq 0 or
        second neq34 neq 0 or
        third neq34 neq 0) and 
       (first neq35 neq 0 or
        second neq35 neq 0 or
        third neq35 neq 0) and 
       (first neq36 neq 0 or
        second neq36 neq 0 or
        third neq36 neq 0) and 
       (first neq37 neq 0 or
        second neq37 neq 0 or
        third neq37 neq 0) and 
       d(v3,v1) = 0 and 
       d(k(v3,v2),k(v3,k(k(k(k(v2,v0),v2),k(v0,v1)),k(v0,v1)))) = 0 and 
        true;
rlqe 
     ex(v3c1,
     ex(v3c3,
     ex(v2c1,
     ex(v2c3,
     ex(v2c2,phi)))));