The theory of extremal graphs is a fascinating area of combinatorics, focused on analyzing the limits and optimal structures of graphs under certain constraints. Questions such as “what is the minimum number of edges needed to ensure a given property?” or “how can we characterize the graphs that reach these limits?” are central to this … Read more
algorithms, combinatorial optimization, discrete mathematics, extreme graphs, graph theory
Harmonic analysis: generalized Fourier transforms
Marion Lefevre
Harmonic analysis represents a fundamental advance in mathematics, offering a powerful key to understanding, decomposing, and studying complex functions and signals. Originating from Fourier series, this field has evolved to include generalized Fourier transforms, allowing for the analysis of not only periodic signals but also a vast array of non-periodic signals in many contexts. This … Read more
fourier transforms, function theory, generalized fourier transforms, harmonic analysis, mathematics
Algebraic topology: homotopy and cohomology
Marion Lefevre
Algebraic topology, a flagship discipline of mathematics, focuses on studying the properties of topological spaces through the lens of algebraic tools. Among its fundamental concepts, homotopy and cohomology play a central role by providing powerful invariants to classify and understand the deep structure of spaces. From loops on a circle to more complex spaces, these … Read more
algebraic topology, cohomology, geometry, homotopy, mathematics
The measure and integration of Lebesgue: foundations of modern analysis
The Lebesgue measure and its associated integration embody a profound revolution in the field of mathematics, particularly in modern analysis. Beyond a simple generalization of the traditional notion of length or area, this theory allows for a grasp of the complexity of functions and measurable spaces with unmatched rigor and power. Introduced by Henri Lebesgue … Read more
Metric spaces: distance and generalized convergence
Metrical spaces are a fundamental cornerstone in the understanding of mathematical structures where the concept of distance plays a primary role. This category of spaces allows not only to generalize the usual distance known in everyday life but also to formalize fundamental concepts such as convergence, topology, or completeness. By exploring the notion of metric … Read more
Differential geometry: curvature and smooth varieties
Differential geometry today stands out as a central field of mathematical research, at the interfaces of algebra, topology, and analysis. It deeply explores the smooth structures that form varieties, these abstract yet manageable spaces, allowing for the extension of intuitions from classical geometry to much broader contexts. This mathematical universe is dominated by the notion … Read more