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. 1971 Apr;68(4):815-9.
doi: 10.1073/pnas.68.4.815.

The writhing number of a space curve

F B Fuller

The writhing number of a space curve

F B Fuller. Proc Natl Acad Sci U S A. 1971 Apr.

Abstract

A geometric invariant of a space curve, the writhing number, is defined and studied. For the central curve of a twisted cord the writhing number measures the extent to which coiling of the central curve has relieved local twisting of the cord. This study originated in response to questions that arise in the study of supercoiled double-stranded DNA rings.

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