Maximum and Minimum

	Toward the square		Between X and H
	Toward the regular polygons		The catenoid
	Going round…		Catenoid or helicoid?
	Toward the sphere		The headphones
	Heron's problem		The singularity of soap films
	The minimum network connecting three points		The singularity of soap films: the tetrahedron
	Hunting for the Steiner Point

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