https://sguzman.github.io/marginalia/tags/cauchy/Recent content in Cauchy on MarginaliaHugoen-usThu, 12 Feb 2026 00:00:00 +0000https://sguzman.github.io/marginalia/posts/complex-plane-canvas/Thu, 12 Feb 2026 00:00:00 +0000https://sguzman.github.io/marginalia/posts/complex-plane-canvas/Complex analysis is a reusable problem-solving canvas: translate a problem into the language of holomorphic or analytic functions on a canonical domain (disk, half-plane, Riemann sphere), then exploit rigidity, integral formulas, and conformal structure to force global conclusions from local data. This report traces the historical development of that strategy from Euler, Gauss, and Cauchy through Riemann and Weierstrass and into modern applications, highlighting flagship victories such as analytic number theory (zeta functions and the prime number theorem), contour methods for generating functions, conformal mapping approaches to 2D PDE boundary-value problems, extremal problems in geometric function theory (Bieberbach/de Branges), and probabilistic conformal methods (SLE). The through-line is that complex analyticity acts as a “straitjacket” that suppresses pathologies and reveals hidden structure, making the complex plane a universal computational and conceptual medium across mathematics, physics, and engineering.https://sguzman.github.io/marginalia/posts/analysis-semantics/Thu, 12 Feb 2026 00:00:00 +0000https://sguzman.github.io/marginalia/posts/analysis-semantics/A historical and conceptual survey of what mathematicians have meant by “analysis” from the Newton–Leibniz era to the present. The essay traces how analysis shifted from a general method of discovery contrasted with synthesis into a distinct discipline centered on limits, continuity, infinite processes, and the continuum. It follows key semantic pivots driven by calculus, the rise of the function concept, the 19th-century program of rigor (Cauchy, Weierstrass), and later expansions into complex, Fourier, functional, and modern applied/abstract analysis, highlighting how boundaries with algebra, geometry, topology, probability, and computation repeatedly blurred and re-formed.