1 Graphical modeling using L-systems.- 1.1 Rewriting systems.- 1.2 DOL-systems.- 1.3 Turtle interpretation of strings.- 1.4 Synthesis of DOL-systems.- 1.4.1 Edge rewriting.- 1.4.2 Node rewriting.- 1.4.3 Relationship between edge and node rewriting.- 1.5 Modeling in three dimensions.- 1.6 Branching structures.- 1.6.1 Axial trees.- 1.6.2 Tree OL-systems.- 1.6.3 Bracketed OL-systems.- 1.7 Stochastic L-systems.- 1.8 Context-sensitive L-systems.- 1.9 Growth functions.- 1.10 Parametric L-systems.- 1.10.1 Parametric OL-systems.- 1.10.2 Parametric 2L-systems.- 1.10.3 Turtle interpretation of parametric words.- 2 Modeling of trees.- 3 Developmental models of herbaceous plants.- 3.1 Levels of model specification.- 3.1.1 Partial L-systems.- 3.1.2 Control mechanisms in plants.- 3.1.3 Complete models.- 3.2 Branching patterns.- 3.3 Models of inflorescences.- 3.3.1 Monopodial inflorescences.- 3.3.2 Sympodial inflorescences.- 3.3.3 Polypodial inflorescences.- 3.3.4 Modified racemes.- 4 Phyllotaxis.- 4.1 The planar model.- 4.2 The cylindrical model.- 5 Models of plant organs.- 5.1 Predefined surfaces.- 5.2 Developmental surface models.- 5.3 Models of compound leaves.- 6 Animation of plant development.- 6.1 Timed DOL-systems.- 6.2 Selection of growth functions.- 6.2.1 Development of nonbranching filaments.- 6.2.2 Development of branching structures.- 7 Modeling of cellular layers.- 7.1 Map L-systems.- 7.2 Graphical interpretation of maps.- 7.3 Microsorium linguaeforme.- 7.4 Dryopteris thelypteris.- 7.5 Modeling spherical cell layers.- 7.6 Modeling 3D cellular structures.- 8 Fractal properties of plants.- 8.1 Symmetry and self-similarity.- 8.2 Plant models and iterated function systems.- Epilogue.- Appendix A Software environment for plant modeling.- A.1 A virtual laboratory in botany.- A.2 List of laboratory programs.- Appendix B About the figures.- Turtle interpretation of symbols.

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The Algorithmic Beauty of Plants

Let X be a compact Riemann surface of genus g _ 2. A holomorphic vector bundle on X is said to be unitary if it arises from a unitary representation of the fundamental group of X. We prove in this paper that on the space of isomorphic classes of unitary vector bundles on X of a given rank, there is a natural structure of a normal projective variety (Theorem 8.1). We recall that Mumford has proved that, on the space of (isomorphic classes) stable vector bundles on X of a given rank and degree, there is a natural structure of a non-singular quasi-projective variety (cf. [7]); further, it was proved in [9] that a vector bundle on X of degree zero is stable if and only if it is associated to an irreducible unitary representation of the fundamental group of X. Thus our result shows the existence of a canonical compactification (as an algebraic variety) of the space of stable bundles on X of a given rank and degree zero. We shall now give a brief outline of the proof. It consists in a refinement of the proof of Mumford for the existence of a natural structure of a quasiprojective variety on the space of stable bundles of a given rank and degree (loc. cit.). Let us fix a very ample invertible sheaf OX(1) on X; then if m is a positive integer which is sufficiently large, we have H'(V(m)) 0 0 and H0( V(m)) generates V(m) for any Ve Or,, where Or, stands for the category of unitary vector bundles on X of rank r. Then the rank of H0(V(m)) is the same whatever be V e OR9; let this be p. The Hilbert polynomial of V(m), is also the same whatever be V e OR,; let this be P. Let Q = Quot(E/P) be the scheme in the sense of Grothendieck; E being the free coherent sheaf of rank p on X (cf. [4]). Let R be the open subscheme of Q consisting of the points which represent quotients of E which are locally free, and whose sections can be canonically identified with H0(E). Thus one has a family of vector bundles {Fq}qeR on X such that every Fq can be canonically considered as a quotient vector bundle of the trivial bundle E on X of rank p. The linear group G = Aut E acts on Q, and R is a G-invariant subscheme; further given V e Or there is a q e R such that Fq V, and the set of such points q con-

Stable and unitary vector bundles on a compact Riemann surface

Uber Modifikationen und exzeptionelle analytische Mengen

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L2 estimates and existence theorems for the $\bar \partial $ operator

0. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 I. The Tarski-Seidenberg theorem and Thorn's lemma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. Semianalytic sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3. Subanalytic sets 16 4. Transforming an analytic function to normal crossings by blowings-up 21 5. Uniformization and rcctilincarization 30 6. I.ojasicwicz's inequality; metric properties of subanalytic sets 33 7. Smooth points of a subanalytic sct 37 Bibliography 42

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Semianalytic and subanalytic sets

Chapters: 1. Differentiable Functions in Rn. Taylor's Formula. Partitions of Unity. Inverse Functions, Implicit Functions and the Rank Theorem. Sard's Theorem and Functional Dependence. Borel's Theorem on Taylor Series. Whitney's Approximation Theorem. An Approximation Theorem for Holomorphic Functions. Ordinary Differential Equations. 2. Manifolds. Basic Definitions. The Tangent and Cotangent Bundles. Grassmann Manifolds. Vector Fields and Differential Forms. Submanifolds. Exterior Differentiation. Orientation. Manifolds with Boundary. Integration. One Parameter Groups. The Frobenius Theorem. Almost Complex Manifolds. The Lemmata of Poincare and Grothendieck. Applications: Hartog's Continuation Theorem and the Oka-Weil Theorem. Immersions and Imbeddings: Whitney's Theorems. Thom's Transversality Theorem. 3. Linear Elliptic Differential Operators. Vector Bundles. Fourier Transforms. Linear Differential Operators. The Sobolev Spaces. The Lemmata of Rellich and Sobolev. The Inequalities of Garding and Friedrichs. Elliptic Operators with C Coefficients: The Regularity Theorem. Elliptic Operators with Analytic Coefficients. The Finiteness Theorem. The Approximation Theorem and Its Application to Open Riemann Surfaces. References. Subject Index.

Analysis on Real and Complex Manifolds

Introduction to the theory of analytic spaces

Drawn from lectures given by Raghavan Narasimhan at the University of Geneva and the University of Chicago, this book presents the part of the theory of several complex variables pertaining to unramified domains over C . Topics discussed are Hartogs' theory, domains in holomorphy, and automorphism of bounded domains.

Raghavan Narasimhan

Papers

Analysis on Real and Complex Manifolds

Introduction to the theory of analytic spaces

Several Complex Variables

The Levi problem for complex spaces

The Levi problem on complex spaces with singularities