Search
Menu
Home
Sources
About
Contacts
Ribbon theory
Ribbon
theory
is a
strand
of
mathematics
within
topology
that has seen particular
application
as
regards
DNA
.
Concepts
Link
is the
integer number
of
turns
of the
ribbon
around its
axis
;
Twist
is the
rate of rotation
of the ribbon around its axis;
Writhe
is a
measure
of non-planarity of the ribbon's axis
curve
.
Work
by
Gheorghe
Călugăreanu
,
James
H.
White
, and F.
Brock
Fuller
led to the
Călugăreanu–White–Fuller theorem
that Link = Writhe + Twist.
