3d graphics mathematics geometry maths trick triangle inequality inequality arithmetic mean geometric mean black polished ceramics ceramics wooden block huge circles permutation sum of inequalities mathematical analysis ptolemy inscribed quadrilateral ptolemy's theorem meander cyclic quadrilateral convex quadrilateral vase inequality vase amphoras vases still life drawing tool angle nails drawing huge circles architecture landscape topology volume wine glass visualisation bottles permutation theorem oppositely ordered similarly ordered sum of products cyclic sum means sum of reciprocals harmonic mean triangle complex integral complex plane parametrization contour integration cauchy real numbers cartesian product aleph 0 continuum uncountably infinite cantor natural numbers equal cardinality one-to-one correspondence bijection language countably infinite indescribable numbers alphabet set theory aleph zero flowers gardening garden nature photos flower beds lilac meadow 2015 spring conjurer root cube naths magician
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