torsion number
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Torsion (gastropod) — Torsion is a gastropod synapomorphy which occurs in all gastropods during larval development. Torsion is the rotation of the visceral mass, mantle and shell 180˚ with respect to the head and foot of the gastropod. This brings the mantle cavity… … Wikipedia
Torsion subgroup — In the theory of abelian groups, the torsion subgroup AT of an abelian group A is the subgroup of A consisting of all elements that have finite order. An abelian group A is called a torsion (or periodic) group if every element of A has finite… … Wikipedia
Torsion-free abelian groups of rank 1 — Infinitely generated abelian groups have very complex structure and are far less well understood than finitely generated abelian groups. Even torsion free abelian groups are vastly more varied in their characteristics than vector spaces. Torsion… … Wikipedia
Torsion (algebra) — In abstract algebra, the term torsion refers to a number of concepts related to elements of finite order in groups and to the failure of modules to be free. Definition Let G be a group. An element g of G is called a torsion element if g has… … Wikipedia
Torsion field (pseudoscience) — For other notions of torsion, see Torsion field and Torsion. Torsion field (pseudoscience) Claims Spin spin interaction can be transmitted through space at speeds of at least up to 109 times the speed of light via a special kind of field, making… … Wikipedia
torsion — torsional, adj. torsionally, adv. /tawr sheuhn/, n. 1. the act of twisting. 2. the state of being twisted. 3. Mech. a. the twisting of a body by two equal and opposite torques. b. the internal torque so produced. 4. Math … Universalium
Whitehead torsion — In mathematics, Whitehead torsion is an invariant of an h cobordism in a Whitehead group, that is important in simple homotopy theory and surgery theory. It is named for J. H. C. Whitehead.Whitehead torsionSuppose that W is an h cobordism from M… … Wikipedia
Betti number — In algebraic topology, the Betti number of a topological space is, in intuitive terms, a way of counting the maximum number of cuts that can be made without dividing the space into two pieces. This defines, in fact, what is called the first Betti … Wikipedia
Testicular torsion — In testicular torsion the spermatic cord that provides the blood supply to a testicle is twisted, cutting off the blood supply, often causing orchalgia. Prolonged testicular torsion will result in the death of the testicle and surrounding tissues … Wikipedia
p-adic number — In mathematics, and chiefly number theory, the p adic number system for any prime number p extends the ordinary arithmetic of the rational numbers in a way different from the extension of the rational number system to the real and complex number… … Wikipedia
Mazur's torsion theorem — In algebraic geometry Mazur s torsion theorem, due to Barry Mazur, classifies the possible torsion subgroups of the group of rational points on an elliptic curve defined over the rational numbers. If Cn denotes the cyclic group of order n, then… … Wikipedia
