From en.wikipedia.org:
[wiktionary] TORSION may refer to: [TOC right]
** Science
- Torsion (mechanics) , the twisting of an object due to an applied torque
- Torsion of spacetime, the field used in Einstein–Cartan theory and
- Alternatives to general relativity
- Torsion angle , in chemistry
*** Biology and medicine
- Torsion fracture or spiral fracture, a bone fracture when torque is applied
- Organ torsion, twisting that interrupts the blood supply to that organ:
- Splenic torsion, causing splenic infarction
- Ovarian torsion
- Testicular torsion
- Penile torsion , a congenital condition
- Torsion of the digestive tract in some domestic animals:
- Torsion, a type of horse colic
- Gastric torsion , or gastric dilatation volvulus
- Torsion (gastropod) , a developmental feature of all gastropods
** Mathematics
- Torsion of a curve
- Torsion tensor , in differential geometry
- Torsion (algebra) , in ring theory
- Torsion group , in group theory and arithmetic geometry
- Tor functor , the derived functors of the tensor product of modules over a ring
- Torsion-free module , in algebra
- See also Torsion-free (disambiguation)
- Analytic torsion (Reidemeister torsion, R-torsion, Franz torsion, de Rham torsion, Ray-Singer torsion), a topological invariant of manifolds
- Whitehead torsion , in geometric topology
** Other uses
- Torsion field (pseudoscience) , a field alleged to make faster-than-light communication and paranormal phenomena possible
[maths]