Sion, Switzerland end of the old town. It houses the oldest playable organ in the world, which was built in the 1430s. Public Airshows have been held at the airfield of Sion. Participated Aerobatic teams have been for example the Frecce Tricolori from Italy as well as the Patrouille de France. The football club FC Sion plays in the Swiss Super League. Their stadium is the Stade Tourbillon. The HC Sion is the city's main Ice hockey team. They play in the Swiss Premiere League, the third tier of Swiss hockey. Their arena is the Ancien Stand which has a seating capacity
Maurice Sion Maurice Sion Maurice Sion (17 October 1927, Skopje – 17 April 2018, Vancouver) was an American and Canadian mathematician, specializing in measure theory and game theory. He is known for Sion's minimax theorem. Sion received from New York University his B.A. in 1947 and his M.A. in 1948. He received from the University of California, Berkeley in 1951 his Ph.D. under the supervision of Anthony Morse with thesis "On the existence of functions having given partial derivatives on Whitney's curve". Sion was a member of the mathematics faculty at U.C. Berkeley until 1960, when he immigrated to Canada with his