Constructive set theory is an approach to mathematical constructivism following the program of axiomatic set theory.
Tulita Airport (IATA: ZFN, ICAO: CZFN) is located adjacent to Tulita, Northwest Territories, Canada. The hours of operation is Monday to Friday from 9am to 5pm local time.
Pukatawagan Airport, (IATA: XPK, ICAO: CZFG), is located 2.5 nautical miles (4.6 km; 2.9 mi) east of Pukatawagan, Manitoba, Canada.
Fort McPherson Airport (IATA: ZFM, ICAO: CZFM) is located 2 nautical miles (3.7 km; 2.3 mi) south of Fort McPherson, Northwest Territories, Canada.
Faro Airport, (IATA: ZFA, ICAO: CZFA), is located 1.5 nautical miles (2.8 km; 1.7 mi) south of Faro, Yukon, Canada, and is operated by the Yukon government.
Fond-du-Lac Airport, (IATA: ZFD, ICAO: CZFD), is located 1 nautical mile (1.9 km) north of Fond-du-Lac, Saskatchewan, Canada.
China Southern Airlines Company Limited is an airline headquartered in Baiyun District, Guangzhou, Guangdong Province, China.
The Czech Republic (/ˈtʃɛk rᵻˈpʌblɪk/ CHEK-rə-PUB-lik; Czech: Česká republika, Czech pronunciation: [ˈt͡ʃɛskaː ˈrɛpuˌblɪka]), also known by the short name Czechia (/ˈtʃɛkiə/, CHEK-ee-ə; Czech: Česko, pronounced [ˈt͡ʃɛsko]), is a nation state in Central Europe bordered by Germany to the west, Austria to the south, Slovakia to the east and Poland to the northeast.
Czechoslovakia or Czecho-Slovakia /ˌtʃɛkoʊsloʊˈvækiə, -kə-, -slə-, -ˈvɑː-/ (Czech and Slovak: Československo, Česko-Slovensko) was a sovereign state in Central Europe that existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the Czech Republic (Czechia) and Slovak Republic (Slovakia) on 1 January 1993.
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug.