Volume of Riemannian manifolds, geometric inequalities, and homotopy theory

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We outline the current state of knowledge regarding geometric inequalities of systolic type, and prove new results, including systolic freedom in dimension 4. Namely, every compact, orientable, smooth 4-manifold X admits metrics of arbitrarily small volume such that every orientable, immersed surface of smaller than unit area is necessarily null-homologous in X.
25 pages, LaTeX2e, 3 figures. To appear in the Rothenberg Festschrift, Contemporary Math

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