Mixing
Orbit of a point and symmetries of a specific graph
$begingroup$
Given is the graph:
I am interested in determining the orbit of the point 1 and also to determine the amount of symmetries that fix each of the points 1, 2 and 3?
My approach:
Notice that the orbit of 1 is simply the cycle ${ 1,2,3}$ because we cannot invert the inner triangle and outer triangles, this would not preserve the graph. We can however cycle the smaller triangles along the central triangle (by means of a rotation over $frac{2}{3}pi$, around the centre).
For the second part I notice that the identity fixes all three points, then each point is fixed by the reflection that has its line of reflection through that point. This reflection would swap two triangles. Behold my paint skills below:
There are in total 3 such reflections, together with the identity we have 4 symmetries that meet the description.
Is this convincing and correct?
geometry symmetry isometry
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
$endgroup$
add a comment |
$begingroup$
Given is the graph:
I am interested in determining the orbit of the point 1 and also to determine the amount of symmetries that fix each of the points 1, 2 and 3?
My approach:
Notice that the orbit of 1 is simply the cycle ${ 1,2,3}$ because we cannot invert the inner triangle and outer triangles, this would not preserve the graph. We can however cycle the smaller triangles along the central triangle (by means of a rotation over $frac{2}{3}pi$, around the centre).
For the second part I notice that the identity fixes all three points, then each point is fixed by the reflection that has its line of reflection through that point. This reflection would swap two triangles. Behold my paint skills below:
There are in total 3 such reflections, together with the identity we have 4 symmetries that meet the description.
Is this convincing and correct?
geometry symmetry isometry
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
$endgroup$
add a comment |
$begingroup$
Given is the graph:
I am interested in determining the orbit of the point 1 and also to determine the amount of symmetries that fix each of the points 1, 2 and 3?
My approach:
Notice that the orbit of 1 is simply the cycle ${ 1,2,3}$ because we cannot invert the inner triangle and outer triangles, this would not preserve the graph. We can however cycle the smaller triangles along the central triangle (by means of a rotation over $frac{2}{3}pi$, around the centre).
For the second part I notice that the identity fixes all three points, then each point is fixed by the reflection that has its line of reflection through that point. This reflection would swap two triangles. Behold my paint skills below:
There are in total 3 such reflections, together with the identity we have 4 symmetries that meet the description.
Is this convincing and correct?
geometry symmetry isometry
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
$endgroup$
Given is the graph:
I am interested in determining the orbit of the point 1 and also to determine the amount of symmetries that fix each of the points 1, 2 and 3?
My approach:
Notice that the orbit of 1 is simply the cycle ${ 1,2,3}$ because we cannot invert the inner triangle and outer triangles, this would not preserve the graph. We can however cycle the smaller triangles along the central triangle (by means of a rotation over $frac{2}{3}pi$, around the centre).
For the second part I notice that the identity fixes all three points, then each point is fixed by the reflection that has its line of reflection through that point. This reflection would swap two triangles. Behold my paint skills below:
There are in total 3 such reflections, together with the identity we have 4 symmetries that meet the description.
Is this convincing and correct?
geometry symmetry isometry
geometry symmetry isometry
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
asked Jan 19 at 15:33
Wesley StrikWesley Strik
2,113423
2,113423
add a comment |
add a comment |
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