By Janos Kollar

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**Example text**

2 The Dirac Derivation The phase-space construction may, of course, be iterated. , P hn+1 (A) := P h(P hn (A)). Let in0 : P hn (A) → P hn+1 (A) be the canonical imbedding, and let dn : P hn (A) → P hn+1 (A) be the corresponding derivation. Since the composition of in0 and the derivation dn+1 is a derivation P hn (A) → P hn+2 (A), there exist by universality a homomorphism in+1 : P hn+1 (A) → P hn+2 (A), 1 such that, dn ◦ in+1 = in0 ◦ dn+1 . 1 Notice that we here compose functions and functors from left to right.

We shall call it the space of tensions, between the two points of the string. e. the space of isomorphism classes of algebra homomorphisms κ : A → R where R is a g-string, and where isomorphisms should correspond to isomorphisms of the g-string, thus conserving the two P hR-points. , p, i = 1 ∨ 2. ∂σ l Notice also that, since any derivation ξ ∈ Derk (A, R) has a natural lifting to a derivation ξ ∈ Derk (P hA, P hR) defined by simply putting ξ(a) = d(ξ(a)), we find, using the general machinery of deformations of diagrams, see [14], that any family of morphisms κ induces a family of the above diagram.

Ws-book9x6 January 25, 2011 11:26 World Scientific Book - 9in x 6in Deformations and Moduli Spaces ws-book9x6 39 (iv) The versal family of n-dimensional simple modules, V˜ := C(n)⊗k V , over Simpn (A), is defined by the morphism, ρ˜ : A → O(n) ⊆ EndC(n) (C(n)) ⊗k V ) Mn (C(n)). (v) The trace ring T rρ˜ ⊆ S(n) ⊆ C(n) defines a commutative affine scheme structure on Simpn (A). Moreover, there is a morphism of schemes, κ : U (n) −→ Simpn (A), such that for any v ∈ U (n), H A(n) (V ) ˆ κ(v) S(n) (Tˆrρ˜)κ(v) ˆ v C(n) Proof.