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Drawing of "Thor's hammer" or Mjölnir found in Sweden
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Wolfgang Staubach's medallion based on this [1]
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A kolam with two cycles, one of which is twisted [2]
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A simplest closed-loop version of heraldic "fret" / "fretty" ornamentation.
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Link Presentations
[edit Notes on L5a1's Link Presentations]
Planar diagram presentation
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X6172 X10,7,5,8 X4516 X2,10,3,9 X8493
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Gauss code
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{1, -4, 5, -3}, {3, -1, 2, -5, 4, -2}
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The coefficients of the monomials are shown, along with their alternating sums (fixed , alternation over ).
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-3 | -2 | -1 | 0 | 1 | 2 | χ |
4 | | | | | | 1 | 1 |
2 | | | | | | | 0 |
0 | | | | 2 | 1 | | 1 |
-2 | | | 1 | 2 | | | 1 |
-4 | | 1 | | | | | 1 |
-6 | | 1 | | | | | 1 |
-8 | 1 | | | | | | -1 |
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