In differential geometry, the Neovius surface is a triply periodic minimal surface originally discovered by Finnish mathematician Edvard Rudolf Neovius, an uncle of Rolf Nevanlinna. The surface has genus 9, dividing space into two infinite non-equivalent labyrinths. Like many other triply periodic minimal surfaces it has been studied in relation to the microstructure of block copolymers, surfactant-water mixtures, and crystallography of soft materials. It can be approximated with the level set surface
3 ( cos x + cos y + cos z ) + 4 cos x cos y cos z = 0 {\displaystyle 3(\cos x+\cos y+\cos z)+4\cos x\cos y\cos z=0}
In Schoen's categorisation it is called the C(P) surface, since it is the "complement" of the Schwarz P surface. It can be extended with further handles, converging towards the expanded regular octahedron (in Schoen's categorisation)
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