By Oscar Zariski

The most target of this publication is to provide a totally algebraic method of the Enriques¿ type of gentle projective surfaces outlined over an algebraically closed box of arbitrary attribute. This algebraic process is without doubt one of the novelties of this publication one of the different glossy textbooks dedicated to this topic. chapters on floor singularities also are integrated. The publication could be necessary as a textbook for a graduate direction on surfaces, for researchers or graduate scholars in algebraic geometry, in addition to these mathematicians operating in algebraic geometry or comparable fields"

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**Example text**

The real spectrum was introduced by Coste and Roy in 1979 [C-R]. The maximal real spectrum (the subspace of Sper(A) consisting of orderings maximal with respect to inclusion) was considered earlier by Krivine in 1964 [Krl]. The real spectrum of a formally real field was also considered earlier by people in quadratic form theory; see [L1] [L2]. We are mainly interested in the ring A = JR[X]. In this case there is a natural embedding JRn~ Sper(JR[X])given by x f-+ Px where The support of Px is the maximal ideal {f evaluation map f f-+ f(x).

Letting l ---+ k, this yields L(k2 - j2) 2: O. -algebra. -vectorspace. The monomials form a basis. The set of these monomials is, of course, countable. of countable dimension. For any finite dimensional subspace W of V, W has a natural topology: Fix a basis Wl, ... , Wn for W. L~=l XiWi ~ (Xl, ... n. ncomes equipped with the standard Euclidean topology. The induced topology on W does not depend on the choice of basis. (A basis change results in a linear change in coordinates. ) This has various nice consequences.

Let X be a locally compact Hausdorff topological space. Locally compact means: V x E X 3 an open set U in X with x E U and U (the closure of U) compact. , the 8~ring generated by the compact sets of X (the smallest family of subsets of X containing all compact subsets of X and closed under finite union, formation of set~theoretic difference A \ B, and countable intersection). 1 DEFINITION. A Borel measure I-" on X is a (positive) measure on X such that every set in 8° (X) is measureable. We also require our Borel measures to be regular in the following sense: V B E 8°(X) and V real € > 0, 3 K, U E 8°(X), K ~ B ~ U, K compact, U open, and I-"(K) +€ ~ I-"(B) ~ I-"(U) ~ 41 €.