### Some articles on *whitehead group, group, whitehead, whitehead group wh, wh*:

...

**Whitehead group**in mathematics may mean A

**group**W with Ext(W, Z)=0 see

**Whitehead**problem For a ring, the

**Whitehead group Wh**(A) of a ring A, equal to For a

**group**, the

**Whitehead group Wh**(G ... Note that this is a quotient of the

**Whitehead group**of the

**group**ring ... The

**Whitehead group Wh**(A) of a simplicial complex or PL-manifold A, equal to

**Wh**(π1(A)) see

**Whitehead**torsion ...

... The

**Whitehead group**of a CW-complex or a manifold M is equal to the

**Whitehead group Wh**(π1(M)) of the fundamental

**group**π1(M) of M ... If G is a

**group**, the

**Whitehead group Wh**(G) is defined to be the cokernel of the map G × {±1} → K1(Z) which sends (g,±1) to the invertible (1,1)-matrix (±g) ... Here Z is the

**group**ring of G ...

### Famous quotes containing the words group wh, whitehead and/or group:

“We begin with friendships, and all our youth is a reconnoitering and recruiting of the holy fraternity they shall combine for the salvation of men. But so the remoter stars seem a nebula of united light, yet there is no group which a telescope will not resolve; and the dearest friends are separated by impassable gulfs.”

—Ralph Waldo Emerson (1803–1882)

“Knowledge shrinks as wisdom grows.”

—Alfred North *Whitehead* (1861–1947)

“He hung out of the window a long while looking up and down the street. The world’s second metropolis. In the brick houses and the dingy lamplight and the voices of a *group* of boys kidding and quarreling on the steps of a house opposite, in the regular firm tread of a policeman, he felt a marching like soldiers, like a sidewheeler going up the Hudson under the Palisades, like an election parade, through long streets towards something tall white full of colonnades and stately. Metropolis.”

—John Dos Passos (1896–1970)