Plateau 1849 / Douglas-Rado 1931: every Jordan curve in ℝ³ bounds a minimal surface (zero mean-curvature). Soap-film physical realisation. Plateau borders + 120° angles. Higher-codimension: Federer-Fleming geometric measure theory.
Plateau 1849 / Douglas-Rado 1931: every Jordan curve in ℝ³ bounds a minimal surface (zero mean-curvature). Soap-film physical realisation. Plateau borders + 120° angles. Higher-codimension: Federer-Fleming geometric measure theory.