Abu Ja'far Muhammed ibn Musa al-Khwarizmi

Arabic
Knuth on Non-Latin Names
a piece of the Alhambra
Mathematics and the Liberal Arts

Symmetry & the Alhambra

Timeline Arabic Mathematics
750 AD - 1500

Arabic Mathematics
of the same period

Granada University

The following sites are more of a touristic nature.

tuSpain

Unesco

Great Buildings

Tore Kjeilen

Virtourist

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A.A. Jagers
the central knot at the bottom

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the corresponding closed knot