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The goal of these lectures is to introduce some fundamental tools in the study of manifolds with a lower bound on Ricci curvature. We will first state and prove the laplacian comparison theorem for manifolds with a lower bound on the Ricci curvature, and derive some important consequences : Bishop-Gromov inequality, Myers theorem, Cheeger-Gromoll splitting theorem. Then we will define the Gromov-Hausdorff distance between metric spaces which will allow us to consider limits of sequences of Riemannian manifolds, along the way we will prove Gromov’s precompactness theorem for sequences of manifolds with a Ricci lower bound. We will also see on examples what type of degeneration can occur when considering these « Ricci limit spaces », we will in particular encounter curvature blow up and volume collapsing. One of the major point in the study of these limit spaces is to understand which results on smooth manifolds with a Ricci lower bound carry on to the limit spaces, we will give an introduction to this topic by outlining the proof by Cheeger.

The goal of these lectures is to introduce some fundamental tools in the study of manifolds with a lower bound on Ricci curvature. We will first state and prove the laplacian comparison theorem for manifolds with a lower bound on the Ricci curvature, and derive some important consequences : Bishop-Gromov inequality, Myers theorem, Cheeger-Gromoll splitting theorem. Then we will define the Gromov-Hausdorff distance between metric spaces which will allow us to consider limits of sequences of Riemannian manifolds, along the way we will prove Gromov’s precompactness theorem for sequences of manifolds with a Ricci lower bound. We will also see on examples what type of degeneration can occur when considering these « Ricci limit spaces », we will in particular encounter curvature blow up and volume collapsing. One of the major point in the study of these limit spaces is to understand which results on smooth manifolds with a Ricci lower bound carry on to the limit spaces, we will give an introduction to this topic by outlining the proof by Cheeger and Colding of the splitting theorem for limit spaces.

The goal of these lectures is to introduce some fundamental tools in the study of manifolds with a lower bound on Ricci curvature. We will first state and prove the laplacian comparison theorem for manifolds with a lower bound on the Ricci curvature, and derive some important consequences : Bishop-Gromov inequality, Myers theorem, Cheeger-Gromoll splitting theorem. Then we will define the Gromov-Hausdorff distance between metric spaces which will allow us to consider limits of sequences of Riemannian manifolds, along the way we will prove Gromov’s precompactness theorem for sequences of manifolds with a Ricci lower bound. We will also see on examples what type of degeneration can occur when considering these « Ricci limit spaces », we will in particular encounter curvature blow up and volume collapsing. One of the major point in the study of these limit spaces is to understand which results on smooth manifolds with a Ricci lower bound carry on to the limit spaces, we will give an introduction to this topic by outlining the proof by Cheeger and Colding of the splitting theorem for limit spaces.

The goal of these lectures is to introduce some fundamental tools in the study of manifolds with a lower bound on Ricci curvature. We will first state and prove the laplacian comparison theorem for manifolds with a lower bound on the Ricci curvature, and derive some important consequences : Bishop-Gromov inequality, Myers theorem, Cheeger-Gromoll splitting theorem. Then we will define the Gromov-Hausdorff distance between metric spaces which will allow us to consider limits of sequences of Riemannian manifolds, along the way we will prove Gromov’s precompactness theorem for sequences of manifolds with a Ricci lower bound. We will also see on examples what type of degeneration can occur when considering these « Ricci limit spaces », we will in particular encounter curvature blow up and volume collapsing. One of the major point in the study of these limit spaces is to understand which results on smooth manifolds with a Ricci lower bound carry on to the limit spaces, we will give an introduction to this topic by outlining the proof by Cheeger.

The goal of the course is to introduce some of the recent developments on discrete conformal geometry of polyhedral surfaces. We plan to cover the following topics.- The Andreev-Koebe-Thurston theorem on circle packing polyhedral metrics and Marden-Rodin’s proof- Thurston’s conjecture on the convergence of circle packings to the Riemann mapping and its solution by Rodin-Sullivan- Finite dimensional variational principles associated to polyhedral surfaces- A discrete conformal equivalence of polyhedral surfaces and its relationship to convex polyhedra in hyperbolic 3-space- A discrete uniformization theorem for compact polyhedral surfaces- Convergence of discrete conformality and some open problems

The goal of the course is to introduce some of the recent developments on discrete conformal geometry of polyhedral surfaces. We plan to cover the following topics.- The Andreev-Koebe-Thurston theorem on circle packing polyhedral metrics and Marden-Rodin’s proof- Thurston’s conjecture on the convergence of circle packings to the Riemann mapping and its solution by Rodin-Sullivan- Finite dimensional variational principles associated to polyhedral surfaces- A discrete conformal equivalence of polyhedral surfaces and its relationship to convex polyhedra in hyperbolic 3-space- A discrete uniformization theorem for compact polyhedral surfaces- Convergence of discrete conformality and some open problems

The goal of these lectures is to introduce some fundamental tools in the study of manifolds with a lower bound on Ricci curvature. We will first state and prove the laplacian comparison theorem for manifolds with a lower bound on the Ricci curvature, and derive some important consequences : Bishop-Gromov inequality, Myers theorem, Cheeger-Gromoll splitting theorem. Then we will define the Gromov-Hausdorff distance between metric spaces which will allow us to consider limits of sequences of Riemannian manifolds, along the way we will prove Gromov’s precompactness theorem for sequences of manifolds with a Ricci lower bound. We will also see on examples what type of degeneration can occur when considering these « Ricci limit spaces », we will in particular encounter curvature blow up and volume collapsing. One of the major point in the study of these limit spaces is to understand which results on smooth manifolds with a Ricci lower bound carry on to the limit spaces, we will give an introduction to this topic by outlining the proof by Cheeger.

The goal of the course is to introduce some of the recent developments on discrete conformal geometry of polyhedral surfaces. We plan to cover the following topics.- The Andreev-Koebe-Thurston theorem on circle packing polyhedral metrics and Marden-Rodin’s proof- Thurston’s conjecture on the convergence of circle packings to the Riemann mapping and its solution by Rodin-Sullivan- Finite dimensional variational principles associated to polyhedral surfaces- A discrete conformal equivalence of polyhedral surfaces and its relationship to convex polyhedra in hyperbolic 3-space- A discrete uniformization theorem for compact polyhedral surfaces- Convergence of discrete conformality and some open problems

The goal of the course is to introduce some of the recent developments on discrete conformal geometry of polyhedral surfaces. We plan to cover the following topics.- The Andreev-Koebe-Thurston theorem on circle packing polyhedral metrics and Marden-Rodin’s proof- Thurston’s conjecture on the convergence of circle packings to the Riemann mapping and its solution by Rodin-Sullivan- Finite dimensional variational principles associated to polyhedral surfaces- A discrete conformal equivalence of polyhedral surfaces and its relationship to convex polyhedra in hyperbolic 3-space- A discrete uniformization theorem for compact polyhedral surfaces- Convergence of discrete conformality and some open problems