Definition:Quasi-Crystal/Historical Note

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Quasi-Crystals: Historical Note

Quasi-crystals were discovered in the $1980$s.

Unlike true crystals, they can have $5$-fold symmetry.

Sources

1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): crystallography
2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): crystallography

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Historical Notes