- Slovakia (Wikipedia)
Slovakia (/sloʊˈvækiə, -ˈvɑːk-/; Slovak: Slovensko [ˈslɔʋenskɔ]), officially the Slovak Republic (Slovak: Slovenská republika [ˈslɔʋenskaː ˈrepublika]), is a landlocked country in Central Europe. It is bordered by Poland to the north, Ukraine to the east, Hungary to the south, Austria to the west, and the Czech Republic to the northwest. Slovakia’s mostly mountainous territory spans about 49,000 square kilometres (19,000 sq mi), hosting a population exceeding 5.4 million. The capital and largest city is Bratislava, while the second largest city is Košice.
Stanford Encyclopedia of Philosophy
- Category Theory (plato.standford.edu)
Category theory has come to occupy a central position in contemporary mathematics and theoretical computer science, and is also applied to mathematical physics. Roughly, it is a general mathematical theory of structures and of systems of structures.