- Leonhard Euler (Wikipedia)
Leonhard Euler (/ˈɔɪlər/ OY-lər, German: [ˈleːɔnhaʁt ˈʔɔʏlɐ], Swiss Standard German: [ˈleːɔnhart ˈɔʏlər]; 15 April 1707 – 18 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of mathematics such as analytic number theory, complex analysis, and infinitesimal calculus. He introduced much of modern mathematical terminology and notation, including the notion of a mathematical function. He is also known for his work in mechanics, fluid dynamics, optics, astronomy, and music theory.
- Temple of Hephaestus (Wikipedia)
The Temple of Hephaestus or Hephaisteion (also “Hephesteum” or “Hephaesteum”; Ancient Greek: Ἡφαιστεῖον, Greek: Ναός Ηφαίστου, and formerly called in error the Theseion or “Theseum”; Ancient Greek: Θησεῖον, Greek: Θησείο), is a well-preserved Greek temple dedicated to Hephaestus; it remains standing largely intact today. It is a Doric peripteral temple, and is located at the north-west side of the Agora of Athens, on top of the Agoraios Kolonos hill. From the 7th century until 1834, it served as the Greek Orthodox church of Saint George Akamates. The building’s condition has been maintained due to its history of varied use.